[ { "anchor": "Possible Chandra-Mechanism for Generation Bound: In the generation structure, the quark mass increases extremely rapidly with\nthe increase of generation index, and there is the bound for generation number.\nThe ground for this bound is investigated on the basis of a certain kind of\ncomposite model of leptons and quarks, in which they are supposed to be\ncomposed of sub-constituents with fermi statistics. Possible Chandrasekhar-like\nmechanism for generation bound is proposed.", "positive": "NNLO virtual and real leptonic corrections to muon-electron scattering: The recently proposed MUonE experiment at CERN aims at providing a novel\ndetermination of the leading order hadronic contribution to the muon anomalous\nmagnetic moment through the study of elastic muon-electron scattering at\nrelatively small momentum transfer. The anticipated accuracy of the order of\n10ppm demands for high-precision predictions, including all the relevant\nradiative corrections. The fixed-order NNLO radiative corrections due to the\nemission of virtual and real leptonic pairs are described and their numerical\nimpact is discussed for typical event selections of the MUonE experiment, by\nmeans of the upgraded Monte Carlo code MESMER." }, { "anchor": "Transport coefficients from the Nambu-Jona-Lasinio model for $SU(3)_f$: We calculate the shear $\\eta(T)$ and bulk viscosities $\\zeta(T)$ as well as\nthe electric conductivity $\\sigma_e(T)$ and heat conductivity $\\kappa(T)$\nwithin the Nambu-Jona-Lasinio model for 3 flavors as a function of temperature\nas well as the entropy density $s(T)$, pressure $P(T)$ and speed of sound\n$c_s^2(T)$. We compare the results with other models such as the\nPolyakov-Nambu-Jona-Lasinio (PNJL) model and the dynamical quasiparticle model\n(DQPM) and confront these results with lattice QCD data whenever available. We\nfind the NJL model to have a limited predictive power for the thermodynamic\nvariables and various transport coefficients above the critical temperature\nwhereas the PNJL model and DQPM show acceptable results for the quantities of\ninterest.", "positive": "Possible Implication of a Single Nonextensive $p_T$ Distribution for\n Hadron Production in High-Energy $pp$ Collisions: Multiparticle production processes in $pp$ collisions at the central rapidity\nregion are usually considered to be divided into independent \"soft\" and \"hard\"\ncomponents. The first is described by exponential (thermal-like) transverse\nmomentum spectra in the low-$p_T$ region with a scale parameter $T$ associated\nwith the temperature of the hadronizing system. The second is governed by a\npower-like distributions of transverse momenta with power index $n$ at\nhigh-$p_T$ associated with the hard scattering between partons. We show that\nthe hard-scattering integral can be approximated as a nonextensive distribution\nof a quasi-power-law containing a scale parameter $T$ and a power index $n=1/(q\n-1)$, where $q$ is the nonextensivity parameter. We demonstrate that the whole\nregion of transverse momenta presently measurable at LHC experiments at central\nrapidity (in which the observed cross sections varies by $14$ orders of\nmagnitude down to the low $p_T$ region) can be adequately described by a single\nnonextensive distribution. These results suggest the dominance of the\nhard-scattering hadron-production process and the approximate validity of a\n\"no-hair\" statistical-mechanical description of the $p_T$ spectra for the whole\n$p_T$ region at central rapidity for $pp$ collisions at high-energies." }, { "anchor": "Jet activity as a probe of high-mass resonance production: We explore the method of using the measured jet activity associated with a\nhigh mass resonance state to determine the corresponding production modes. To\ndemonstrate the potential of the approach, we consider the case of a resonance\nof mass $M_R$ decaying to a diphoton final state. We perform a Monte Carlo\nstudy, considering three mass points $M_R=0.75,\\,1.5\\,,2.5$ TeV, and show that\nthe $\\gamma\\gamma$, $WW$, $gg$ and light and heavy $q\\overline{q}$ initiated\ncases lead to distinct predictions for the jet multiplicity distributions. As\nan example, we apply this result to the ATLAS search for resonances in diphoton\nevents, using the 2015 data set of $3.2\\,{\\rm fb}^{-1}$ at $\\sqrt{s}=13$ TeV.\nTaking the spin-0 selection, we demonstrate that a dominantly $gg$-initiated\nsignal hypothesis is mildly disfavoured, while the $\\gamma\\gamma$ and light\nquark cases give good descriptions within the limited statistics, and a\ndominantly $WW$-initiated hypothesis is found to be in strong tension with the\ndata. We also comment on the $b\\overline{b}$ initial state, which can already\nbe constrained by the measured $b$-jet multiplicity. Finally, we present\nexpected exclusion limits with integrated luminosity, and demonstrate that with\njust a few 10's of ${\\rm fb}^{-1}$ we can expect to constrain the production\nmodes of such a resonance.", "positive": "Signatures of new physics versus the ridge phenomenon in hadron-hadron\n collisions at the LHC: In this paper, we consider the possibility that a new stage of matter,\nstemming from hidden/dark sectors beyond the Standard Model, to be formed in\n$pp$ collisions at the LHC, can significantly modify the correlations among\nfinal-state particles. In particular, two-particle azimuthal correlations are\nstudied by means of a Fourier series sensitive to the near-side ridge effect\nwhile assuming that hidden/dark particles decay on top of the conventional\nparton shower. Then, new (fractional) harmonic terms should be included in the\nFourier analysis of the azimuthal anisotropies, encoding the hypothetical new\nphysics contribution enabling its detection in a complementary way to other\nsignatures." }, { "anchor": "Analytic Structure of Three-Mass Triangle Coefficients: ``Three-mass triangles'' are a class of integral functions appearing in\none-loop gauge theory amplitudes. We discuss how the complex analytic\nproperties and singularity structures of these amplitudes can be combined with\ngeneralised unitarity techniques to produce compact expressions for three-mass\ntriangle coefficients. We present formulae for the N=1 contributions to the\nn-point NMHV amplitude.", "positive": "Unified TeV Scale Picture of Baryogenesis and Dark Matter: We present a simple extension of MSSM which provides a unified picture of\ncosmological baryon asymmetry and dark matter. Our model introduces a gauge\nsinglet field $N$ and a color triplet field $X$ which couple to the\nright--handed quark fields. The out--of equilibrium decay of the Majorana\nfermion $N$ mediated by the exchange of the scalar field $X$ generates adequate\nbaryon asymmetry for $M_N \\sim 100$ GeV and $M_X \\sim$ TeV. The scalar partner\nof $N$ (denoted $\\tilde{N}_1$) is naturally the lightest SUSY particle as it\nhas no gauge interactions and plays the role of dark matter. $\\tilde{N}_1$\nannihilates into quarks efficiently in the early universe via the exchange of\nthe fermionic $\\tilde{X}$ field. The model is experimentally testable in (i)\nneutron--antineutron oscillations with a transition time estimated to be around\n$10^{10}$ sec, (ii) discovery of colored particles $X$ at LHC with mass of\norder TeV, and (iii) direct dark matter detection with a predicted cross\nsection in the observable range." }, { "anchor": "Central exclusive $\u03c7_{c,b}$ production at high energy colliders and\n gluon saturation approach: The central exclusive production of $\\chi_{c}$ and $\\chi_{b}$ at the LHC,\nRHIC and Tevatron energies is analyzed, using the recent unintegrated parton\ndistribution (UGDs) functions available in the package TMDlib. Comparison with\ndata is performed, which tests the underlying assumptions basing the\ntheoretical approach and it can constrain the unintegrated gluon distribution\nfunction at the small-$x$ region. Predictions for LHC energies using recent\nUGDs based in CCFM formalism are provided. It is explored the underlying\nuncertainties on this production as the choice for the unintegrated gluon\ndistribution and factorization scale is done. Moreover, based on the parton\nsaturation model for the gluon distribution, analytical expressions for the\nrapidity distributions are proposed. The prompt production of $J/\\psi+\\gamma$\nand $\\Upsilon+\\gamma$ is computed for the first time for LHC energies within\nthe very same formalism used for $\\chi$ production.", "positive": "A scalar potential from gauge condensation and its implications: We consider a scalar field $\\phi$ whose coupling to the kinetic term of a\nnon-abelian gauge field is set at an UV scale $M$. Then the confinement of the\ngauge sector will induce a $\\phi$-dependent vacuum energy which generates a\ndimensionful potential for the scalar. It provides a good example of dynamical\ngeneration of a new physics scale below $M$ through the vacuum expectation\nvalue $\\langle \\phi \\rangle$. This mechanism may shed light on the origin of\ndark matter, or spontaneous symmetry breaking applicable to the electroweak\nsymmetry." }, { "anchor": "Determination of $\u039b_{\\bar{MS}}$ at five loops from holographic QCD: The recent determination of the $\\beta$--function of the QCD running coupling\n$\\alpha_{\\overline{MS}}(Q^2)$ to 5-loops{\\color{blue},} provides a verification\nof the convergence of a novel method for determining the fundamental QCD\nparameter $\\Lambda_s$ based on the Light-Front Holographic approach to\nnonperturbative QCD. The new 5-loop analysis, together with improvements in\ndetermining the holographic QCD nonperturbative scale parameter $\\kappa$ from\nhadronic spectroscopy, leads to an improved precision of the value of\n$\\Lambda_s$ in the ${\\overline{MS}}$ scheme close to a factor of two; we find\n$\\Lambda^{(3)}_{\\overline{MS}}=0.339\\pm0.019$ GeV for $n_{f}=3$, in excellent\nagreement with the world average, $\\Lambda_{\\overline{MS}}^{(3)}=0.332\\pm0.017$\nGeV. We also discuss the constraints imposed on the scale dependence of the\nstrong coupling in the nonperturbative domain by superconformal quantum\nmechanics and its holographic embedding in anti-de Sitter space.", "positive": "Suppression of Electroweak Instanton Processes in High-energy Collisions: Electroweak instantons are a prediction of the Standard Model and have been\nstudied in great detail in the past although they have not been observed.\nEarlier calculations of the instanton production cross section at colliders\nrevealed that it was exponentially suppressed at low energies, but may grow\nlarge at energies (much) above the sphaleron mass. Such calculations faced\ndifficulty in the breakdown of the instanton perturbation theory in the\nhigh-energy regime. In this paper we review the calculation for the electroweak\ninstanton cross section using the optical theorem, including quantum effects\narising from interactions in the initial state and show that this leads to an\nexponential suppression of the cross section at all energies, rendering the\nprocess unobservable." }, { "anchor": "Magnetic and Thermodynamic Stability of SU(2) Yang-Mills Theory: SU(2) Yang-Mills theory at finite extension or, equivalently, at finite\ntemperature is probed by a homogeneous chromomagnetic field. We use a recent\nmodified axial gauge formulation which has the novel feature of respecting the\ncenter symmetry in perturbation theory. The characteristic properties of the\nZ_2-symmetric phase, an extension-dependent mass term and antiperiodic boundary\nconditions, provide stabilization against magnetic field formation for\nsufficiently small extension or high temperature. In an extension of this\ninvestigation to the deconfined phase with broken center symmetry, the combined\nconstraints of thermodynamic and magnetic stability are shown to yield many of\nthe high temperature properties of lattice SU(2) gauge theory.", "positive": "Decay behaviors of the fully-bottom and fully-charm tetraquark states: We study the decay behaviors of the fully-bottom tetraquark states within the\ndiquark-antidiquark picture, and calculate their relative branching ratios\nthrough the Fierz rearrangement. Our results suggest that the $C=+$ states can\nbe searched for in the $\\mu^+ \\mu^- \\Upsilon(1S)$ and $\\mu^+ \\mu^-\n\\Upsilon(2S)$ channels with the relative branching ratio $\\mathcal{B}(X \\to\n\\mu\\mu \\Upsilon(2S)) / \\mathcal{B}(X \\to \\mu \\mu \\Upsilon(1S)) \\approx 0.4$.\nOur results also suggest that the $C=-$ states can be searched for in the\n$\\mu^+ \\mu^- \\eta_b(1S)$ and $\\mu^+ \\mu^- \\eta_b(2S)$ channels with the similar\nrelative branching ratio $\\mathcal{B}(X \\to \\mu\\mu \\eta_b(2S)) / \\mathcal{B}(X\n\\to \\mu \\mu \\eta_b(1S)) \\approx 0.4$. We also reanalysis the fully-charm\ntetraquark states, and study the $X(6900)$ decay into the $J/\\psi \\psi(2S)$\nchannel to obtain the relative branching ratio $\\mathcal{B}(X \\to J/\\psi\n\\psi(2S)) / \\mathcal{B}(X \\to J/\\psi J/\\psi) \\approx 0.1$." }, { "anchor": "Neutrino Superbeam Scenarios at the Peak: We discuss options for U.S. long baseline neutrino experiments using upgraded\nconventional neutrino beams, assuming $L/E_\\nu$ is chosen to be near the peak\nof the leading oscillation. We find that for L = 1290 km (FNAL-Homestake) or\n1770 km (FNAL-Carlsbad, or BNL-Soudan) it is possible to simultaneously have\ngood $\\sin^22\\theta_{13}$ reach and sgn($\\delta m^2_{31}$) determination, and\npossibly sizeable $\\tau$ rates and some $\\delta$ sensitivity.", "positive": "Photon Fragmentation in Large-Q2 ep Collisions at Next-to-Leading Order\n QCD: We study the production of photons accompanied by jets in large-Q2 deep\ninelastic scattering. Numerical results for the cross section differential with\nrespect to the fraction of momentum z_gamma carried by a photon inside a jet at\nlarge z_gamma, up to O(alpha alpha_s) in perturbative QCD, are presented. The\nsensitivity to the fragmentation contribution allows one to study the\nquark-to-photon fragmentation function. Our results can be confronted with\nfuture experimental data from HERA." }, { "anchor": "SU_L(4) x U(1) model for electroweak unification: After some general remarks about SU_L(4) electroweak unification, the model\nis extended to SU_L(4)xU_X(1) to accomodate fractionally charged quarks. The\nunification scale is expected to be in TeV region. A right-handed Majorana\nneutrino along with known lepton are put in the fundamental representation of\nSU_L(4) with Y_X=0. The see-saw mechanism for neutrino masses and flavor mixing\nin neutrino sector is a natural feature of the model. The lepton number\nviolating processes can occure through dilepton gauge bosons contained in the\nmodel.", "positive": "Bern-Kosower Rule for Scalar QED: We derive a full Bern-Kosower-type rule for scalar QED starting from quantum\nfield theory: we derive a set of rules for calculating $S$-matrix elements for\nany processes at any order of the coupling constant. Gauge-invariant set of\ndiagrams in general is first written in the worldline path-integral expression.\nThen we integrate over $x(\\tau)$, and the resulting expression is given in\nterms of correlation function on the worldline $\\left< x(\\tau) x(\\tau')\n\\right>$. Simple rules to decompose the correlation function into basic\nelements are obtained. Gauge transformation known as integration by parts\ntechnique can be used to reduce the number of independent terms before\nintegration over proper-time variables. The surface terms can be omitted\nprovided the external scalars are on-shell. Also, we clarify correspondence to\nthe conventional Feynman rule, which enabled us to avoid any ambiguity coming\nfrom the infinite dimensionality of the path-integral approach." }, { "anchor": "Structure Function Subgroup Summary: We summarize the studies and discussions of the Structure Function subgroup\nof the QCD working group of the Snowmass 1996 Workshop: New Directions for High\nEnergy Physics.", "positive": "Inverse Seesaw Mechanism in Nonsupersymmetric SO(10), Proton Lifetime,\n Nonunitarity Effects, and a Low-mass Z' Boson: Recently realization of TeV scale inverse seesaw mechanism in supersymmetric\nSO(10) framework has led to a number of experimentally verifiable predictions\nincluding low-mass W_R and Z' gauge bosons and nonunitarity effects. Using\nnonsupersymmetric SO(10) grand unified theory, we show how a TeV scale inverse\nseesaw mechanism for neutrino masses is implemented with a low-mass Z' boson\naccessible to Large Hadron Collider. We derive renormalization group equations\nfor fermion masses and mixings in the presence of the intermediate symmetries\nof the model and extract the Dirac neutrino mass matrix at the TeV scale from\nsuccessful GUT-scale parameterization of fermion masses. We estimate leptonic\nnonunitarity effects measurable at neutrino factories and lepton flavor\nviolating decays expected to be probed in near future. While our prediction on\nthe nonunitarity matrix element $\\eta_{\\mu\\tau}$ for degenerate right-handed\nneutrinos is similar to the supersymmetric SO(10) case, we find new predictions\nwith significantly enhanced value of its phase $\\delta_{\\mu\\tau}\\simeq\n10^{-4}-10^{-2}$ when partial degeneracy among these neutrino masses is\nadequately taken into account by a constraint relation that emerges naturally\nin this approach. Other predictions on branching ratios and CP-Violating\nparameters are discussed. An important distinguishing characteristic as another\ntest of the minimal model is that the threshold corrected two-loop prediction\nof the proton lifetime with maximum value ({\\tau}_p)_{max}\\simeq 10^{35} yrs.\nis accessible to ongoing search experiments for the decay $p\\to e^+\\pi^0$ in\nthe near future. Simple model extensions with longer proton lifetime\npredictions are also discussed." }, { "anchor": "Flavour constraints on the Aligned Two-Higgs-Doublet Model and CP\n violation: The Aligned Two-Higgs-Doublet Model (A2HDM) describes a particular way of\nenlarging the scalar sector of the Standard Model, with a second Higgs doublet\nwhich is aligned to first the one in flavour space. This implies the absence of\nflavour-changing neutral currents at tree level and the presence of three\ncomplex parameters. Within this general approach, we analyze the charged Higgs\nphenomenology, including CP asymmetries in the K and B systems.", "positive": "Exponential parameterization of neutrino mixing matrix with account for\n CP-violation data: The exponential parameterization of Pontecorvo-Maki-Nakagawa-Sakata mixing\nmatrix for neutrino is discussed. The exponential form allows easy\nfactorization and separate analysis of the CP-violating and Majorana terms.\nBased upon the recent experimental data on the neutrino mixing, the values for\nthe exponential parameterization matrix for neutrinos are determined. The\nmatrix entries for the pure rotational part in charge of the mixing without\nCP-violation are derived. The complementarity hypothesis for quarks and\nneutrinos is demonstrated. The comparison of the results, based on most recent\nand on old data is held. The CP-violating parameter value is estimated, based\non the so far imprecise experimental indications, regarding CP-violation for\nneutrinos. The unitarity of the exponential parameterisation and the\nCP-violating term transform is confirmed. The transform of the neutrino mass\nstate vector by the exponential matrix with account for CP-violation is shown." }, { "anchor": "Stochastic Jet Quenching in High Energy Nuclear Collisions: Energy losses of fast color particles in random inhomogeneous color medium\ncreated in high energy nuclear collisions are estimated.", "positive": "Soft asymptotics with mass gap: From the operator product expansion the gluon condensate controls a certain\npower law correction to the ultraviolet behavior of the gauge theory. This is\nreflected by the asymptotic behavior of the effective gluon mass function as\ndetermined by its Schwinger-Dyson equation. We show that the current state of\nthe art determination of the gluon mass function by Binosi, Ibanez and\nPapavassiliou points to a vanishing gluon condensate. If this is correct then\nthe vacuum energy also vanishes in massless QCD. This result can be interpreted\nas a statement about a softness in the ultraviolet behavior and the consistency\nof this behavior with a mass gap." }, { "anchor": "Effects on sin\u03b8_{12} from perturbation of the neutrino mixing\n matrix with the partially degenerated neutrino masses: We consider a situation where the leading-order neutrino mass matrix is\nderived by a theoretical ansatz and reproduces the experimental data well, but\nnot completely. Then, the next stage is to try to fully reproduce the data by\nadding small perturbation terms. In this paper, we obtain the analytical method\nto diagonalize the perturbed mass matrix and find a consistency condition that\nparameters should satisfy not to change \\sin\\theta_{12} much. This condition\ncould cause parameter tuning and plays a crucial role in relating the added\nperturbation terms with the prediction analytically, in particular, for the\ncase of the partially quasi-degenerated neutrino masses (m_2 \\simeq m_1) where\nneutrinoless double beta decays would be observed in the phase-II experiments.", "positive": "Mixing of Xi_c and Xi_c' Baryons: The mixing angle between the Xi_c and Xi_c' baryons is shown to be small,\nwith a negligible shift in the Xi_c masses." }, { "anchor": "Transverse-momentum-dependent wave functions with Glauber gluons in $B\n \\to \u03c0\u03c0$, $\u03c1\u03c1$ decays: We investigate the Glauber-gluon effect on the $B \\to \\pi \\pi$ and $\\rho\n\\rho$ decays, which is introduced via a convolution of a universal Glauber\nphase factor with transverse-momentum-dependent(TMD) meson wave functions in\nthe $k_T$ factorization theorem. For an appropriate parametrization of the\nGlauber phase, it is observed that a TMD wave function for the pion ($\\rho$\nmeson) with a weak (strong) falloff in parton transverse momentum $k_T$ leads\nto significant (moderate) modification of the $B^0 \\to \\pi^0 \\pi^0$ ($B^0 \\to\n\\rho^0 \\rho^0$) branching ratio: the former (latter) is enhanced (reduced) by\nabout a factor of 2 (15\\%). This observation is consistent with the dual role\nof the pion as a massless Nambu-Goldstone boson and as a $q \\bar q$ bound\nstate, which requires a tighter spatial distribution of its leading Fock state\nrelative to higher Fock states. The agreement between the theoretical\npredictions and the data for all the $B \\to \\pi \\pi$ and $\\rho^0 \\rho^0$\nbranching ratios is then improved simultaneously, and it is possible to resolve\nthe $B \\to \\pi \\pi$ puzzle.", "positive": "Flat Directions and Baryogenesis in Supersymmetric Theories: Flat directions are a generic feature of supersymmetric theories. They are of\ncosmological interest because they can lead to coherent production of scalars.\nIn the early universe such flat directions could be dangerous due to the\npotentially large energy density and the late decay of the associated scalars\nwhen they have only $1/M_p$ couplings (Polonyi problem). On the other hand,\nflat directions among the standard model fields can carry baryon number and\nlead to a possible mechanism for baryogenesis (Affleck Dine baryogenesis). When\nconsidering the cosmological consequences of the flat directions, it is\nimportant to take into account the soft potential with curvature of order the\nHubble constant due to supersymmetry breaking in the early universe. In this\ntalk, we discuss flat directions, their potential cosmological implications\nfocusing on Affleck-Dine baryogenesis, and how the standard picture of their\nevolution must be modified in the presence of the large supersymmetry breaking\nin the early universe." }, { "anchor": "Jet tomography in heavy ion collisions with deep learning: Deep learning techniques have the power to identify the degree of\nmodification of high energy jets traversing deconfined QCD matter on a\njet-by-jet basis. Such knowledge allows us to study jets based on their\ninitial, rather than final energy. We show how this new technique provides\nunique access to the genuine configuration profile of jets over the transverse\nplane of the nuclear collision, both with respect to their production point and\ntheir orientation. Effectively removing the selection biases induced by\nfinal-state interactions, one can in this way analyse the potential azimuthal\nanisotropies of jet production associated to initial-state effects.\nAdditionally, we demonstrate the capability of our new method to locate with\nprecision the production point of a dijet pair in the nuclear overlap region,\nin what constitutes an important step forward towards the long term quest of\nusing jets as tomographic probes of the quark-gluon plasma.", "positive": "L-Particle and Kaluza-Klein World: We present some arguments in favour of that the Kaluza-Klein picture of the\nworld has been confirmed in the experiments at very low energies where the\nnucleon-nucleon dynamics has been studied. Early predicted ${\\cal L}$-particle\nis related to the new scale of strong nucleon-nucleon forces in the spirit of\nKaluza-Klein approach. It is shown that KK excitations remarkably describe the\nexperimentally observed mass spectrum of diproton system." }, { "anchor": "Spectral cutoffs in indirect dark matter searches: Indirect searches for dark matter annihilation or decay products in the\ncosmic-ray spectrum are plagued by the question of how to disentangle a dark\nmatter signal from the omnipresent astrophysical background. One of the\npractically background-free smoking-gun signatures for dark matter would be the\nobservation of a sharp cutoff or a pronounced bump in the gamma-ray energy\nspectrum. Such features are generically produced in many dark matter models by\ninternal Bremsstrahlung, and they can be treated in a similar manner as the\ntraditionally looked-for gamma-ray lines. Here, we discuss prospects for seeing\nsuch features with present and future Atmospheric Cherenkov Telescopes.", "positive": "Weak decays to final states with Radial Excitation Admixtures: We consider the weak decays of a B meson to final states that are mixtures of\nS-wave radially excited components. We consider non leptonic decays of the type\n$B \\to \\rho' \\pi/B \\to \\rho \\pi$, $B \\to \\omega' \\pi/B \\to \\omega \\pi$ and $B\n\\to \\phi' \\pi/B \\to \\phi \\pi$ where $\\rho'$, $\\omega'$ and $\\phi'$ are higher\n$\\rho$, $\\omega$ and $\\phi$ resonances. We find such decays to have larger or\nsimilar branching ratios compared to decays where the final state $\\rho$,\n$\\omega$ and $\\phi$ are in the ground state. We also study the effect of radial\nmixing in the vector and the pseudoscalar systems generated from hyperfine\ninteraction and the annihilation term. We find the effects of radial mixing to\nbe small and generally negligible for all practical purposes in the vector\nsystem. However, in the $\\eta-\\eta^{\\prime}$ system the effects of radial\nmixing are appreciable and seriously affect decay branching ratios for $B \\to\n\\eta(\\eta')K(K^*)$. In particular we find that nonstandard $\\eta(\\eta')$ mixing\ncan resolve the puzzles in $B \\to \\eta(\\eta')K$ decays." }, { "anchor": "Doubly-heavy baryons, tetraquarks, and related topics: We review the physics of doubly-heavy baryons $QQq$ and tetraquarks $QQ\\bar\nq\\bar q$. For the latter, the stability is reached for large enough mass ratio\n$M/m$, even when spin forces and color mixing are neglected. It is thus\ncustomarily claimed that $bb\\bar q\\bar q$ in its ground state cannot decay into\n$b\\bar q+b\\bar q$. In some model, $cc\\bar u\\bar d$ is shown to be stable if\ncolor mixing and spin effects are properly taken into account. It is\nconjectured that some $bc\\bar q\\bar q'$ benefits from favorable adjustments of\nthe gluon tubes in the confinement regime. Some recent studies of pentaquarks\nand hexaquarks are also summarized.", "positive": "Signature of same-sign top pair production mediated by a nonuniversal\n $Z^\\prime$ with QCD next-to-leading accuracy at the LHC: We present a detailed study of the same-sign top pair production mediated by\na non-universal $Z^\\prime$ including production and decay at the Large Hadron\nCollider (LHC) at the QCD next-to-leading order (NLO) level, using the narrow\nwidth approximation and helicity amplitudes method. We find that the QCD NLO\ncorrections can loose the constraint on the model parameters and reduce the\ndependence of the total cross sections on the factorization scale\nsignificantly. We also study the signature and backgrounds of the process at\nthe NLO level. In order to suppress the backgrounds, we further investigate the\ndifference between the production rates of the positively and negatively\ncharged dilepton at the LHC, and find that the same-sign dilepton signal of the\nnew physics could be discovered more easily." }, { "anchor": "Electroweak baryogenesis in the Z3-invariant NMSSM: We calculate the baryon asymmetry of the Universe in the Z3-invariant\nNext-to-Minimal Supersymmetric Standard Model where the interactions of the\nsinglino provide the necessary source of charge and parity violation. Using the\nclosed time path formalism, we derive and solve transport equations for the\ncases where the singlet acquires a vacuum expectation value (VEV) before and\nduring the electroweak phase transition. We perform a detailed scan to show how\nthe baryon asymmetry varies throughout the relevant parameter space. Our\nresults show that the case where the singlet acquires a VEV during the\nelectroweak phase transition typically generates a larger baryon asymmetry,\nalthough we expect that the case where the singlet acquires a VEV first is far\nmore common for any model in which parameters unify at a high scale. Finally,\nwe examine the dependence of the baryon asymmetry on the three-body\ninteractions involving gauge singlets.", "positive": "Update of the Unitarity Triangle Analysis: We present the update of the Unitarity Triangle (UT) analysis within the\nStandard Model (SM) and beyond. Within the SM, combining the direct\nmeasurements on sides and angles, the UT turns out to be overconstraint in a\nconsistent way, showing that the CKM matrix is the dominant source of flavour\nmixing and CP-violation and that New Physics (NP) effects can appear at most as\nsmall corrections to the CKM picture. Generalizing the UT analysis to\ninvestigate NP effects, constraints on b -> s transitions are also included and\nboth CKM and NP parameters are fitted simultaneously. While no evidence of NP\neffects is found in K-\\bar K and B_d-\\bar B_d mixing, in the B_s-\\bar B_s\nmixing an hint of NP is found at the 2.9 \\sigma level. The UT analysis beyond\nthe SM also allows us to derive bounds on the coefficients of the most general\n\\Delta F=2 effective Hamiltonian, that can be translated into bounds on the NP\nscale." }, { "anchor": "Effects of the restoration of U$_A$(1) symmetry on pseudoscalar meson\n observables: We investigate the restoration of chiral SU$(3)\\otimes$SU$(3)$ and axial\nU$_A$(1) symmetries, at finite temperature and density, in the framework of the\nthree flavor Nambu-Jona-Lasinio model with anomaly. We implement a temperature\n(density) dependence of the anomaly coefficient motivated by lattice results\nfor the topological susceptibility and we discuss the restoration of symmetries\nby analyzing the behavior of the mesonic chiral partners and of the mixing\nangles. The results indicate that the axial part of the symmetry is restored\nbefore the possible restoration of the full U(3)$\\otimes$U(3) chiral symmetry\ncan occur.", "positive": "Higgs decay into two photons, dispersion relations and trace anomaly: We examine the contribution of W boson loops to the amplitude of the process\nH --> \\gamma \\gamma within the dispersion relation approach, taking up an issue\nraised in this context recently. We show that the non-vanishing limit of the\nrelevant formfactor for mW --> 0 is due to a finite subtraction induced by the\nvalue of the corresponding trace anomaly. The argument can be truned around and\none thus arrives at a dispersive (\"infrared\") derivation of the trace anomaly." }, { "anchor": "CP violation from pure gauge in extra dimensions: One of the Sakharov's condition for baryogenesis is the violation of both C\nand CP. In the Standard Model, gauge interactions break maximally C, but CP is\nonly broken through the Yukawa couplings in the poorly understood scalar\nsector. In extra-dimensional models, extra components of gauge fields behave as\nscalars in 4D and can acquire effective vev's through (finite) quantum effects\n(Hosotani mechanism). This mechanism is used to build a toy model with 2\nextra-dimensions compactified on a flat torus $T^2$, where a SU(2) gauge\nsymmetry is broken to U(1) and CP violation (in 4D) is expected. This is\nverified by computing a non-vanishing electric dipole moment.", "positive": "Single Leptoquark Production at $e^+e^-$ and $\u03b3\u03b3$ Colliders: We consider single production of leptoquarks (LQ's) at $e^+e^-$ and\n$\\gamma\\gamma$ colliders, for two values of the centre-of-mass energy,\n$\\sqrt{s}=500$ GeV and 1 TeV. We find that LQ's which couple within the first\ngeneration are observable for LQ masses almost up to the kinematic limit, both\nat $e^+e^-$ and $\\gamma\\gamma$ colliders, for the LQ coupling strength equal to\n$\\alpha_{em}$. The cross sections for single production of $2^{nd}$- and\n$3^{rd}$-generation LQ's at $e^+e^-$ colliders are too small to be observable.\nIn $\\gamma\\gamma$ collisions, on the other hand, $2^{nd}$-generation LQ's with\nmasses much larger than $\\sqrt{s}/2$ can be detected. However,\n$3^{rd}$-generation LQ's can be seen at $\\gamma\\gamma$ colliders only for\nmasses at most $\\sim\\sqrt{s}/2$, making their observation more probable via the\npair production mechanism." }, { "anchor": "Medium-induced emissions of hard gluons: We present a derivation of the medium-induced gluon radiation spectrum beyond\nthe current limitation of soft gluon emission. Making use of the path integral\napproach to describe the propagation of high-energy particles inside a medium,\nwe study the limiting case of a hard gluon emission. Analytical and numerical\nresults are presented and discussed within the multiple soft scattering\napproximation. An ansatz interpolating between soft and hard gluon emissions is\nprovided. The Landau-Pomeranchuk-Migdal effect is observed in the expected\nkinematic region.", "positive": "Accessing Linearly Polarized Gluon Distribution in $J/\u03c8$ Production\n at the Electron-Ion Collider: We calculate the $cos~2 \\phi$ asymmetry in $J/\\psi$ production in\nelectron-proton collision for the kinematics of the planned electron-ion\ncollider (EIC). This directly probes the Weisz\\\"acker-Williams (WW) type\nlinearly polarized gluon distribution. Assuming generalized factorization, we\ncalculate the asymmetry at next-to-leading-order (NLO) when the energy fraction\nof the $J/\\psi$ satisfies $z<1$ and the dominating subprocess is $\\gamma^* +g\n\\rightarrow c + {\\bar c}+g$. We use non-relativistic QCD based color singlet\nmodel for $J/\\psi$ production. We investigate the small $x$ region which will\nbe accessible at the EIC. We present the upper bound of the asymmetry, as well\nas estimate it using a (i) Gaussian type parametrization for the TMDs and (ii)\nMcLerran-Venugopalan model at small $x$. We find small but sizable asymmetry in\nall the three cases." }, { "anchor": "Prompt neutrinos and intrinsic charm at SHiP: We present a new evaluation of the far-forward neutrino plus antineutrino\nflux and number of events from charm hadron decays in a 400 GeV proton beam\ndump experiment like the Search for Hidden Particles (SHiP). Using\nnext-to-leading order perturbative QCD and a model for intrinsic charm, we\ninclude intrinsic transverse momentum effects and other kinematic angular\ncorrections. We compare this flux to a far-forward flux evaluated with\nnext-to-leading order perturbative QCD, without intrinsic transverse momentum,\nthat used the angular distribution of charm quarks rather than the neutrinos\nfrom their decays. The tau neutrino plus antineutrino number of events in the\nperturbative QCD evaluation is reduced by a factor of about three when\nintrinsic transverse momentum and the full decay kinematics are included. We\nshow that intrinsic charm contributions can significantly enhance the number of\nevents from neutrinos from charm hadron decays. Measurements of the number of\nevents from tau neutrino plus antineutrino interactions and of the muon charge\nasymmetry as a function of energy can be used to constrain intrinsic charm\nmodels.", "positive": "Possible $J^{PC} = 0^{--}$ Charmonium-like State: We study the possible charmonium-like states with $J^{PC}=0^{--}, 0^{-+}$\nusing the tetraquark interpolating currents with the QCD sum rules approach.\nThe extracted masses are around 4.5 GeV for the $0^{--}$ charmonium-like states\nand 4.6 GeV for the $0^{-+}$ charmonium-like states while their\nbottomonium-like analogues lie around 10.6 GeV. We also discuss the possible\ndecay, production and the experiment search of the $0^{--}$ charmonium-like\nstate." }, { "anchor": "Exotic Hadrons with Hidden Charm and Strangeness: We investigate on exotic tetraquark hadrons of the kind [cs][cbar sbar] by\ncomputing their spectrum and decay modes within a constituent\ndiquark-antidiquark model. We also compare these predictions with the present\nexperimental knowledge.", "positive": "Study of the effect of neutrino oscillations on the supernova neutrino\n signal in the LVD detector: The LVD detector, located in the INFN Gran Sasso National Laboratory (Italy),\nstudies supernova neutrinos through the interactions with protons and carbon\nnuclei in the liquid scintillator and interactions with the iron nuclei of the\nsupport structure. We investigate the effect of neutrino oscillations in the\nsignal expected in the LVD detector. The MSW effect has been studied in detail\nfor neutrinos travelling through the collapsing star and the Earth. We show\nthat the expected number of events and their energy spectrum are sensitive to\nthe oscillation parameters, in particular to the mass hierarchy and the value\nof $\\theta_{13}$, presently unknown. Finally we discuss the astrophysical\nuncertainties, showing their importance and comparing it with the effect of\nneutrino oscillations on the expected signal." }, { "anchor": "Scaling Properties of light (anti)nuclei and (anti)hypertriton\n production in Au+Au collisions at $\\sqrt{s_{\\rm{NN}}} = 200$ GeV: We present the scaling properties of mass number of light (anti)nuclei\nproduction in midrapidity Au + Au collisions at $\\sqrt {s_{NN}}=200$ GeV based\non the PACIAE + DCPC model. It is found that the integrated yield of light\n(anti)nuclei decreased exponentially with the increase of mass numbers which\ndepends on the centrality, this properties of the system can be described\nquantitatively by temperature $T$ at hadronic freeze-out, and the model results\nare consistent with STAR data. Furthermore, we found that the integrated yield\nof heavier (anti)nuclei per participant nucleon increases from peripheral to\ncentral collisions more rapidly than that of $d(\\bar{d})$, indicating that the\nmass scale of light (anti)nuclei production was presented in relativistic heavy\nion collisions.", "positive": "A Two Channel Calculation of Screening Corrections: We present a two channel eikonal calculation in which the rescattering\nthrough a diffractive channel is included in addition to the elastic channel.\nConsidering the spread of the experimental data, we find that we can obtain a\nvery good description of $\\s_{tot}$, $\\s_{el}$ and $B_{el}$ in the ISR -\nTevatron energy range. In this range of energy the diffractive channel, that\nwas included in our calculation, leads to a ratio of $\\s_{SD}/\\s_{el}$ which\nvaries between 1 and 0.5 for $20 GeV \\leq \\sqrt{s} \\leq 14 TeV$ in agreement\nwith the experimental data. The calculated survival probability of dijet\nproduction with a large rapidity gap is consistent with the data." }, { "anchor": "Handbook of the analytic and expansion formulae for the muon $g-2$\n anomaly: Since announcement of the muon $g-2$ anomaly, plenty of papers have devoted\nto this anomaly. The approximate formulae are always adopted when determining\nthe new physics contributions to $(g-2)_{\\mu}$, while clear scope of\napplications are always absent. This manuscript is dedicated to the\ncomprehensive analytical results and approximations for the canonical\ninteractions at one-loop level, which can be a useful handbook for the model\nbuilders. Here, we only collect the analytic and approximate expressions for\nthe scalar mediator case. For the expressions of vector mediator case, they\nwill appear in the future.", "positive": "Quarkonium production and TMDs at LHC: In this contribution we briefly discuss an ongoing phenomenological programme\non quarkonium production in unpolarized and polarized proton-proton collisions\nin a fixed target setup at LHCb, the LHCSpin project. Within a TMD approach, we\naim at considering in particular: the relative role of the NRQCD color-singlet\nand color-octet production mechanisms, both for unpolarized and polarized\nquarkonium production; the study of azimuthal and transverse single-spin\nasymmetries as a phenomenological tool for learning about the almost unknown\ngluon Sivers function; the role of initial- and final-state interactions for\nspin asymmetries." }, { "anchor": "Scotogenic Inverse Seesaw Model of Neutrino Mass: A variation of the original 2006 radiative seesaw model of neutrino mass\nthrough dark matter is shown to realize the notion of inverse seesaw naturally.\nThe dark-matter candidate here is the lightest of three real singlet scalars\nwhich may also carry flavor.", "positive": "DGLAP equation and x-evolution of Non-singlet structure function in\n Leading order: Study of parton distribution function (PDF) is a topic of significant\ninterest in QCD. To overcome the shortcomings of conventional PDFs, several\nalternative methods have been suggested in recent years. The present work\nreports the x distribution of the Non-singlet structure function in Leading\norder using the complete solution of Taylor-approximated DGLAP equation. The\nformalism is more general than the similar ones reported in recent literature.\nOur predictions are compared with the CCFR neutrino data as well as exact\nresults." }, { "anchor": "Event Generation with Sherpa 2.2: Sherpa is a general-purpose Monte Carlo event generator for the simulation of\nparticle collisions in high-energy collider experiments. We summarize essential\nfeatures and improvements of the Sherpa 2.2 release series, which is heavily\nused for event generation in the analysis and interpretation of LHC Run 1 and\nRun 2 data. We highlight a decade of developments towards ever higher precision\nin the simulation of particle-collision events.", "positive": "Flat direction condensate instabilities in the MSSM: Coherently oscillating scalar condensates formed along flat directions of the\nMSSM scalar potential are unstable with respect to spatial perturbations if the\npotential is flatter than phi^2, resulting in the formation of non-topological\nsolitons such as Q-balls. Using renormalization group we calculate the\ncorrections to the phi^2 potential for a range of flat directions and show that\nunstable condensates are a generic feature of the MSSM. Exceptions arise for an\nexperimentally testable range of stop and gluino masses when there are large\nadmixtures of stops in the flat direction scalar." }, { "anchor": "Two-current correlations in the pion in the Nambu and Jona-Lasinio model: We present an analysis of two-current correlations for the pion in the\nNambu--Jona-Lasinio model, with Pauli--Villars regularization. We provide\nexplicit expressions in momentum space for two-current correlations\ncorresponding to the zeroth component of the vector Dirac bilinear in the quark\nvertices, which has been evaluated on the lattice. The numerical results show a\nremarkable qualitative agreement with recent lattice data. The factorization\napproximation into one-body currents is discussed.", "positive": "The cosmological information on neutrino mixing: Cosmology provides interesting information on neutrino mixing models with\nsterile neutrinos. In this case non standard BBN effects can be relevant. We\nshow how the recent measurement of the baryon content from the observations of\nCMB anisotropies together with the primordial nuclear abundances measurements\ncan be used to constrain them. In particular four neutrino mixing models are\npotentially at variance with the cosmological observations. We also discuss the\npossible scenarios from future experiments." }, { "anchor": "Precision Observables in the MSSM: Status and Perspectives: The current status of the theoretical predictions for the electroweak\nprecision observables M_W, sin^2_theta_eff and m_h within the MSSM is briefly\nreviewed. The impact of recent electroweak two-loop results to the quantity\nDelta_rho is analysed and the sensitivity of the electroweak precision\nobservables to the top-quark Yukawa coupling is investigated. Furthermore the\nlevel of precision necessary to match the experimental accuracy at the next\ngeneration of colliders is discussed.", "positive": "Sterile neutrinos in the light of IceCube: We determine constraints on parameters of a single eV-scale light neutrino\nusing IceCube-59 data. Particular emphasis is put on the question whether such\nan analysis can rule out sterile neutrino hints. While important complementary\ninformation is provided, the different dependence on the various sterile\nneutrino mixing angles makes it currently not possible to fully exclude short\nbaseline appearance results or sterile neutrinos in general." }, { "anchor": "Light Adjoint Quarks in the Instanton-Dyon Liquid Model IV: We discuss the instanton-dyon liquid model with $N_f$ Majorana quark flavors\nin the adjoint representation of color $SU_c(2)$ at finite temperature. We\nbriefly recall the index theorem on $S^1\\times R^3$ for twisted adjoint\nfermions in a BPS dyon background of arbitrary holonomy, and use the ADHM\nconstruction to explicit the adjoint anti-periodic zero modes. We use these\nresults to derive the partition function of an interacting instanton-dyon\nensemble with $N_f$ light and anti-periodic adjoint quarks. We develop the\nmodel in details by mapping the theory on a 3-dimensional quantum effective\ntheory with adjoint quarks with manifest $SU(N_f)\\times Z_{4N_f}$ symmetry.\nUsing a mean-field analysis at weak coupling and strong screening, we show that\ncenter symmetry requires the spontaneous breaking of chiral symmetry, which is\nshown to only take place for $N_f=1$. For a sufficiently dense liquid, we find\nthat the ground state is center symmetric and breaks spontaneously flavor\nsymmetry through $SU(N_f)\\times Z_{4N_f}\\rightarrow O(N_f)$. As the liquid\ndilutes with increasing temperature, center symmetry and chiral symmetry are\nrestored. We present numerical and analytical estimates for the transition\ntemperatures.", "positive": "Exactly Solvable Model for the QCD Tricritcal Endpoint: An inclusion of temperature and chemical potential dependent surface tension\ninto the gas of quark-gluon bags model resolves a long standing problem of a\nunified description of the first and second order phase transition with the\ncross-over. The suggested model has an exact analytical solution and allows one\nto rigorously study the vicinity of the critical endpoint of the deconfinement\nphase transition. It is found that at the curve of a zero surface tension\ncoefficient there must exist the surface induced phase tranition of the 2-nd or\nhigher order. The present model predicts that the critical endpoint (CEP) of\nquantum chromodynamics is the tricritical endpoint." }, { "anchor": "The twist-2 Compton operator and its hidden Wandzura-Wilczek and\n Callan-Gross relations: Power corrections for virtual Compton scattering at leading twist are\netermined at operator level. From the complete off-cone representation of the\ntwist-2 Compton operator integral representations for the trace, antisymmetric\nand symmetric part of that operator are derived. The operator valued invariant\nfunctions are written in terms of iterated operators and may lead to\ninterrelations. For matrix elements they go over into relations for generalized\nparton distributions. -- Reducing to the s-channel relevant part one gets\noperator pre-forms of the Wandzura-Wilczek and the (target mass corrected)\nCallan-Gross relations whose structure is exactly the same as known from the\ncase of deep inelastic scattering; taking non-forward matrix elements one\nreproduces earlier results [B. Geyer, D. Robaschik and J. Eilers, Nucl. Phys. B\n704 (2005) 279] for the absorptive part of the virtual Compton amplitude. --\nAll these relations, obtained without any approximation or using equations of\nmotion, are determined solely by the twist-2 structure of the underlying\noperator and, therefore, are purely of geometric origin.", "positive": "Dispersion relation for hadronic light-by-light scattering: two-pion\n contributions: In this third paper of a series dedicated to a dispersive treatment of the\nhadronic light-by-light (HLbL) tensor, we derive a partial-wave formulation for\ntwo-pion intermediate states in the HLbL contribution to the anomalous magnetic\nmoment of the muon $(g-2)_\\mu$, including a detailed discussion of the\nunitarity relation for arbitrary partial waves. We show that obtaining a final\nexpression free from unphysical helicity partial waves is a subtle issue, which\nwe thoroughly clarify. As a by-product, we obtain a set of sum rules that could\nbe used to constrain future calculations of $\\gamma^*\\gamma^*\\to\\pi\\pi$. We\nvalidate the formalism extensively using the pion-box contribution, defined by\ntwo-pion intermediate states with a pion-pole left-hand cut, and demonstrate\nhow the full known result is reproduced when resumming the partial waves. Using\ndispersive fits to high-statistics data for the pion vector form factor, we\nprovide an evaluation of the full pion box,\n$a_\\mu^{\\pi\\text{-box}}=-15.9(2)\\times 10^{-11}$. As an application of the\npartial-wave formalism, we present a first calculation of $\\pi\\pi$-rescattering\neffects in HLbL scattering, with $\\gamma^*\\gamma^*\\to\\pi\\pi$ helicity partial\nwaves constructed dispersively using $\\pi\\pi$ phase shifts derived from the\ninverse-amplitude method. In this way, the isospin-$0$ part of our calculation\ncan be interpreted as the contribution of the $f_0(500)$ to HLbL scattering in\n$(g-2)_\\mu$. We argue that the contribution due to charged-pion rescattering\nimplements corrections related to the corresponding pion polarizability and\nshow that these are moderate. Our final result for the sum of pion-box\ncontribution and its $S$-wave rescattering corrections reads\n$a_\\mu^{\\pi\\text{-box}} + a_{\\mu,J=0}^{\\pi\\pi,\\pi\\text{-pole LHC}}=-24(1)\\times\n10^{-11}$." }, { "anchor": "Off-shell $W$-pair production in $e^+ e^-$-annihilation. Initial state\n radiation: With a current-splitting technique, we calculate the gauge-invariant\ninitial-state radiation to order \\oalf\\ with soft-photon exponentiation for on-\nand off-shell $W$-pair production. This result generalizes the convolution\nformula, which is known from the description of the $Z$ resonance, to the case\nof the production of two $W$-bosons. After up to eightfold analytical\nintegrations, a sufficiently smooth integral over three invariant masses\nremains to be treated numerically. Including the Coulomb singularity, the\nlargest corrections are covered. We discuss the corrections in a large energy\nrange up to $\\sqrt{s}$=1~TeV and draw numerical conclusions on their influence\non the $W$-mass determination at LEP~200. Table~1 and figure~5 are revised\nafter correcting the analytical formulae for the nonuniversal corrections.", "positive": "Dispersive Bounds on The Shape Of Lambda_b to Lambda_c l {\\bar \u03bd_l}\n Formfactors: We derive a theoretically allowed domain for the charge radius $\\rho$ and\ncurvature $c$ of the Isgur-Wise function describing the decay $\\Lambda_b \\to\n\\Lambda_c l {\\bar \\nu_l}$. Our method uses crossing symmetry, dispersion\nrelations and analyticity in the context of the Heavy Quark Effective Theory\nbut is independent of the specifics of any given model. The experimentally\ndetermined values of the $\\Upsilon$ masses have been used as input information.\nThe results are of interest for testing different models employed to calculate\nthe heavy baryon formfactors which are used for the extraction of $| V_{cb} |$\nfrom the experimental data." }, { "anchor": "Pentaquark Update After Ten Years: Studying scattering of heavy flavor hadrons and looking for bound states is\nshown to give experimental information otherwise unobtainable about effective\ntwo-body interactions between constituent $(qq)_6$ and $(\\bar qq)_8$ pairs\nrespectively in color sextet and color octet states. All the successes of the\nconstituent quark model in $(uds)$ hadron spectroscopy are shown to depend only\non effective two-body interactions in color $3^*$ and singlet states. New\ndirections for bound pentaquark searches are discussed following the\navailability of vertex detectors which can pinpoint events where a proton is\nemitted from a secondary vertex. Any such event indicates a particle decaying\nweakly by proton emission and the discovery of a new particle if its mass is\nhigher than that of known charmed baryons. There is no combinatorial background\nand striking decay signatures like $p \\phi \\pi^-$ are no longer needed. The\nbeauty pentaquark ($\\bar b suud$) and the doubly-strange pentaquark ($\\bar c\nssud$) may be relevant to future searches. A simple calculation shows that the\neffects of flavor-SU(3) breaking on their binding relative to the relevant\nthresholds are similar to that for the singly-strange pentaquark ($\\bar c\nsuud$) relative to the $D_s p$ threshold.", "positive": "Exploring LHC Run 1 and 2 data using the Madala hypothesis: The Standard Model (SM) Higgs boson, with its experimental discovery in 2012,\nhas long been an interesting particle to study with the intention of exploring\nnew physics ideas beyond the SM (BSM). Its properties are still not well\nunderstood, and there are several features in LHC Run 1 and Run 2 data which\npoint at the possibility of extensions to the SM Higgs sector. This work\nexplores the Madala hypothesis, which is the introduction of a heavy scalar\n(the Madala boson) to the SM, in addition to a real scalar $S$ and dark matter\n(DM) candidate $\\chi$. This hypothesis has previously been used to explain\nseveral anomalous features observe in the LHC Run 1 data. This work extends the\nstudy to Run 2 data, and shows that the particle spectrum predicted in the\nMadala hypothesis is indeed compatible with LHC data. Further study prospects\nand striking signatures for searches are presented." }, { "anchor": "Geometrical Scaling in Inelastic Inclusive Particle Production at the\n LHC: Analyzing recent ALICE data on inelastic pp scattering at the LHC energies we\nshow that charged particle distributions exhibit geometrical scaling (GS). We\nshow also that the inelastic cross-section is scaling as well and that in this\ncase the quality of GS is better than for multiplicities. Moreover, exponent\n$\\lambda$ characterizing the saturation scale is for the cross-section scaling\ncompatible with the one found in deep inelastic ep scattering at HERA. Next, by\nparametrizing charged particles distributions by the Tsallis-like formula, we\nfind a somewhat unexpected solution that still exhibits GS, but differs from\nthe \"standard\" one where the Tsallis temperature is proportional to the\nsaturation scale.", "positive": "The Dirac Form Factor Predicts the Pauli Form Factor in the Endpoint\n Model: We compute the momentum-transfer dependence of the proton Pauli form factor\n$F_{2}$ in the endpoint overlap model. We find the model correctly reproduces\nthe scaling of the ratio of $F_{2}$ with the Dirac Form factor $F_{1}$ observed\nat the Jefferson Laboratory. The calculation uses the leading-power, leading\ntwist Dirac structure of the quark light-cone wave function, and the same\nendpoint dependence previously determined from the Dirac form factor $F_{1}$.\nThere are no parameters and no adjustable functions in the endpoint model's\nprediction for $F_{2}$. The model's predicted ratio $F_{2}(Q^{2})/F_{1}(Q^{2})$\nis quite insensitive to the endpoint wave function, which explains why the\nobserved ratio scales like $1/Q$ down to rather low momentum transfers. The\nendpoint model appears to be the only comprehensive model consistent with all\nform factor information as well as reproducing fixed-angle proton-proton\nscattering at large momentum transfer. Any one of the processes is capable of\npredicting the others." }, { "anchor": "Top-Down Approach to Unified Supergravity Models: We introduce a new approach for studying unified supergravity models. In this\napproach all the parameters of the grand unified theory (GUT) are fixed by\nimposing the corresponding number of low energy observables. This determines\nthe remaining particle spectrum whose dependence on the low energy observables\ncan now be investigated. We also include some SUSY threshold corrections that\nhave previously been neglected. In particular the SUSY threshold corrections to\nthe fermion masses can have a significant impact on the Yukawa coupling\nunification.", "positive": "New quantum (anti)de Sitter algebras and discrete symmetries: Two new quantum anti-de Sitter so(4,2) and de Sitter so(5,1) algebras are\npresented. These deformations are called either time-type or space-type\naccording to the dimensional properties of the deformation parameter. Their\nHopf structure, universal R matrix and differential-difference realization are\nobtained in a unified setting by considering a contraction parameter related to\nthe speed of light, which ensures a well defined non-relativistic limit. Such\nquantum algebras are shown to be symmetry algebras of either time or space\ndiscretizations of wave/Laplace equations on uniform lattices. These results\nlead to a proposal fortime and space discrete Maxwell equations with quantum\nalgebra symmetry." }, { "anchor": "From the Higgs to the top: Couplings and Rare Decays: Within the Standard Model the Higgs couplings to fermions and gauge bosons,\nas function of the particle mass, are predicted to lay on a single line.\nHowever, new patterns appear in multi-Higgs models that employ the\nFroggart-Nielsen mechanism, where the diagonal couplings could lay on different\nlines and flavor-violating Higgs couplings could appear too. These aspects are\nstudied for a specific model with 3+1 Higgs doublets and a singlet FN field.\nConstraints on the model are derived from the Higgs search at LHC, and some\nremarks are presented on their implications for the rare top and Higgs decay, t\n-> ch and h -> \\tau \\mu.", "positive": "Spin rotation and birefringence effect for a particle in a high energy\n storage ring and measurement of the real part of the coherent elastic\n zero-angle scattering amplitude, electric and magnetic polarizabilities: In the present paper the equations for the spin evolution of a particle in a\nstorage ring are analyzed considering contributions from the tensor electric\nand magnetic polarizabilities of the particle. Study of spin rotation and\nbirefringence effect for a particle in a high energy storage ring provides for\nmeasurement as the real part of the coherent elastic zero-angle scattering\namplitude as well as tensor electric and magnetic polarizabilities.\n We proposed the method for measurement the real part of the elastic coherent\nzero-angle scattering amplitude of particles and nuclei in a storage ring by\nthe paramagnetic resonance in the periodical in time nuclear pseudoelectric and\npseudomagnetic fields." }, { "anchor": "Hidden-Charm Tetraquarks and Charged Zc States: Experimentally several charged axial-vector hidden-charm states were\nreported. Within the framework of the color-magnetic interaction, we have\nsystematically considered the mass spectrum of the hidden-charm and\nhidden-bottom tetraquark states. It is impossible to accommodate all the three\ncharged states $Z_c(3900)$, $Z_c(4025)$ and $Z_c(4200)$ within the axial vector\ntetraquark spectrum simultaneously. Not all these three states are tetraquark\ncandidates. Moreover, the eigenvector of the chromomagnetic interaction\ncontains valuable information of the decay pattern of the tetraquark states.\nThe dominant decay mode of the lowest axial vector tetraquark state is $J/\\psi\n\\pi$ while its $D^*\\bar{D}$ and $\\bar{D}^*D^*$ modes are strongly suppressed,\nwhich is in contrast with the fact that the dominant decay mode of $Z_c(3900)$\nand $Z_c(4025)$ is $\\bar{D}D^*$ and $\\bar{D}^*D^*$ respectively. We emphasize\nthat all the available experimental information indicates that $Z_c(4200)$ is a\nvery promising candidate of the lowest axial vector hidden-charm tetraquark\nstate.", "positive": "Single-diffractive production of dijets within the $k_t$-factorization\n approach: We discuss single-diffractive production of dijets. The cross section is\ncalculated within the resolved pomeron picture, for the first time in the\n$k_t$-factorization approach, neglecting transverse momentum of the pomeron. We\nuse Kimber-Martin-Ryskin unintegrated parton (gluon, quark, antiquark)\ndistributions (UPDF) both in the proton as well as in the pomeron or subleading\nreggeon. The UPDFs are calculated based on conventional MMHT2014nlo PDFs in the\nproton and H1 collaboration diffractive PDFs used previously in the analysis of\ndiffractive structure function and dijets at HERA. For comparison we present\nresults of calculations performed within collinear-factorization approach. Our\nresults remaind those obtained in the NLO approach. The calculation is (must\nbe) supplemented by the so-called gap survival factor which may, in general,\ndepend on kinematical variables. We try to describe the existing data from\nTevatron and make detailed predictions for possible LHC measurements. Several\ndifferential distributions are calculated. The $\\overline{E}_T$,\n$\\overline{\\eta}$ and $x_{\\bar p}$ distributions are compared with the Tevatron\ndata. A reasonable agreement is obtained for the first two distributions. The\nlast one requires to introduce a gap survival factor which depends on\nkinematical variables. We discuss how the phenomenological dependence on one\nkinematical variable may influence dependence on other variables such as\n${\\overline E}_T$ and ${\\overline \\eta}$. Several distributions for the LHC are\nshown." }, { "anchor": "Doubly charmed baryon decays $\u039e_{cc}^{++}\\to\u039e_c^{(\\prime)+}\u03c0^+$ in\n the quark model: In this work we study the doubly charmed baryon decays\n$\\Xi_{cc}^{++}\\to\\Xi_c^{(\\prime)+}\\pi^+$ within the framework of the\nnon-relativistic quark model (NRQM). Factorizable amplitudes are expressed in\nterms of transition form factors, while nonfactorizable amplitudes arising form\nthe inner $W$-emission are evaluated using current algebra and the pole model\nand expressed in terms of baryonic matrix elements and axial-vector form\nfactors. Nonperturbative parameters are then calculated using the NRQM. They\ncan be expressed in terms of the momentum integrals of baryon wave functions,\nwhich are in turn expressed in terms of the harmonic oscillator parameters\n$\\alpha_\\rho$ and $\\alpha_\\lambda$ for $\\rho$- and $\\lambda$-mode excitation.\nThe measured ratio $R$ of the branching fraction of $\\Xi_{cc}^{++}\\to\n\\Xi^{\\prime +}_c\\pi^+$ relative to $\\Xi_{cc}^{++}\\to \\Xi_c^+\\pi^+$ can be\naccommodated in the NRQM with $\\alpha_{\\rho 1}$ and $\\alpha_{\\rho_2}$ being in\nthe vicinity of 0.51 and 0.19, respectively, where $\\alpha_{\\rho 1}$ is the\n$\\alpha_\\rho$ parameter for $\\Xi_{cc}^{++}$ and $\\alpha_{\\rho 2}$ for\n$\\Xi_{c}^{(\\prime)+}$. Decay asymmetries are predicted to be $-0.78$ and\n$-0.89$ for $\\Xi_c^+\\pi^+$ and $\\Xi_c^{\\prime +}\\pi^+$ modes, respectively,\nwhich can be tested in the near future. We compare our results with other works\nand point out that although some other models can accommodate the ratio $R$,\nthey tend to lead to a branching fraction of $\\Xi_{cc}^{++}\\to \\Xi_c^+\\pi^+$\ntoo large compared to that inferred from the LHCb measurement of its rate\nrelative to $\\Xi_{cc}^{++}\\to\\Lambda_c^+ K^- \\pi^+\\pi^+$.", "positive": "A simple toy model for effective restoration of chiral symmetry in\n excited hadrons: A simple solvable toy model exhibiting effective restoration of chiral\nsymmetry in excited hadrons is constructed. A salient feature is that while\nphysics of the low-lying states is crucially determined by the spontaneous\nbreaking of chiral symmetry, in the high-lying states the effects of chiral\nsymmetry breaking represent only a small correction. Asymptotically the states\napproach the regime where their properties are determined by the underlying\nunbroken chiral symmetry." }, { "anchor": "Confinement and Light-Front QCD: Numerical results for the (rest-frame) $Q\\bar{Q}$ potential in light-front\nquantized $QCD_{2+1}$ on a $\\perp$ lattice are presented. Both in the\nlongitudinal as well as the $\\perp$ spatial directions one obtains linear\nconfinement. The confinement mechanism in light-front QCD depends on the\norientation of the external charges: for longitudinally (with respect to the\nboost direction in the infinite momentum frame) separated quarks, confinement\narises from the instantaneous interaction piece in the Hamiltonian while for\n$\\perp$ separated quarks, the confinement mechanism is similar to the one in\nHamiltonian lattice QCD. Nevertheless, already a very simple ansatz for the\neffective link-field potential yields an almost rotationally symmetric\n$Q\\bar{Q}$ potential. The momentum carried by the glue strongly depends on the\norientation (\"polarization\") of the $Q\\bar{Q}$ pair.", "positive": "Signs for new physics in the recent LHCb data?: We comment on some tensions with the Standard Model predictions in the recent\nLHCb data." }, { "anchor": "New inflation in supergravity after Planck and LHC: We revisit a single-field new inflation model based on a discrete R symmetry.\nInterestingly, the inflaton dynamics naturally leads to a heavy gravitino of\nmass m_3/2 = O(1-100) TeV, which is consistent with the standard-model like\nHiggs boson of mass mh = 126 GeV. However, the predicted spectral index n_s =\n0.94 is in tension with the Planck result, n_s = 0.9603+-0.073. We show that\nthe spectral index can be increased by allowing a small constant term in the\nsuperpotential during inflation. The required size of the constant is close to\nthe largest allowed value for successful inflation, and it may be a result of a\npressure toward larger values in the landscape. Alternatively, such constant\nterm may arise in association with supersymmetry breaking required to cancel\nthe negative cosmological constant from the inflaton sector.", "positive": "Top-squark pair production at the LHC: a complete analysis at\n next-to-leading order: We present a complete next-to-leading order study of top-squark pair\nproduction at the LHC, including QCD and EW corrections. The calculation is\nperformed within the Minimal Supersymmetric Standard Model and numerical\nresults are presented for parameter regions compatible with the observed Higgs\nboson. We employ the most recent parton distribution functions including QED\ncorrections and we find NLO EW corrections to the inclusive stop-pair\nproduction cross section up to $25 - 30\\%$ compared to the leading-order\nprediction. Besides corrections to inclusive cross sections also important\nkinematic distributions are investigated." }, { "anchor": "QED correction to asymmetry for polarized ep-scattering from the method\n of the electron structure functions: The electron structure function method is applied to calculate\nmodel-independent radiative corrections to an asymmetry of electron-proton\nscattering. The representations for both spin-independent and spin-dependent\nparts of the cross-section are derived. Master formulae take into account the\nleading corrections in all orders and the main contribution of the second order\nnext-to-leading ones and have accuracy at the level of one per mille. Numerical\ncalculations illustrate our analytical results for both elastic and deep\ninelastic events.", "positive": "Unitarity Analyses of $\u03c0N$ Elastic Scattering Amplitudes: The pion - nucleon scattering phase shifts in $s$ and $p$ waves are analyzed\nusing PKU unitarization approach that can separate the phase shifts into\ndifferent contributions from poles and branch cuts. It is found that in\n$S_{11}$ and $P_{11}$ channels, there exist large and positive missing\ncontributions when one compares the phase shift from known resonances plus\nbranch cuts with the experimental data, which indicates that those two channels\nmay contain sizable effects from $N^*(1535)$ and $N^*(1440)$ shadow poles.\nThose results are obtained using tree level results of the $\\pi N$ amplitude." }, { "anchor": "Light stop decays into $W b \\tilde\u03c7_1^0$ near the kinematic\n threshold: We investigate the decays of the light stop in scenarios with the lightest\nneutralino $\\tilde{\\chi}_1^0$ being the lightest supersymmetric particle,\nincluding flavour-violating (FV) effects. We analyse the region where the\nthree-body decay $\\tilde{t}_1\\to W b \\tilde{\\chi}_1^0$ is kinematically allowed\nand provide a proper description of the transition region between the\nthree-body decay and the four-body decay $\\tilde{t}_1 \\to\\tilde{\\chi}_1^0 b f\n\\bar{f}'$. The improved treatment has been implemented in the Fortran package\n{\\tt SUSY-HIT} and is used for the analysis of this region. A scan over the\nparameter range including all relevant experimental constraints reveals that\nthe FV two-body decay into charm and $\\tilde{\\chi}_1^0$ can be as important as\nthe three-, respectively, four-body decays if not dominant and therefore should\nbe taken into account in order to complete the experimental searches for the\nlight stop.", "positive": "Trace and axial anomalies on equal footing: We discuss for some particular non supersymmetric theories a generalized\nsymmetry that includes both the scale and axial transformations and leads to a\nsingle current that may contain also a pseudoscalar term. The method, inspired\nby the superconformal anomalies has important application for low energy\neffective models where it allows the introduction of a single complex glueball\nfield with a scalar and a pseudoscalar component on the same footing with the\ncomplex meson nonets fields made of quarks. Both axial and trace and axial\nanomalies are satisfied in accordance to the meson structure and the QCD\nrequirements." }, { "anchor": "A parametrization of the baryon octet and decuplet masses: We construct a general parametrization of the baryon octet and decuplet mass\noperators including the three-body terms using the unit operator and the\nsymmetry-breaking factors $M^d=\\textrm{diag} (0,1,0)$ and $M^s=\\textrm{diag}\n(0,0,1)$ in conjunction with the spin operators. Our parametrization has the\nminimal number of operators needed to describe all the octet and decuplet\nmasses. Investigating the likely size of the three-body terms, we find that\ncontributions of the three-body hypercharge splittings are comparable to those\nfrom the one- and two-body isospin splittings and that contributions of the\nthree-body isospin splitting operators are very small. We prove that, in\ndynamical calculations, one must go to three loops to get the three-body terms.\nWe also find that the suggested hierarchy of sizes for terms in the most\ngeneral expression for baryon masses that involve multiple factors of $M^d$\nand/or $M^s$ does not hold strictly for dynamical calculations in heavy baryon\nchiral perturbation theory: terms of a given order in a meson loop expansion\nmay appear both with the expected factors of $M^d$ and $M^s$, and with one\nfactor more.", "positive": "Cosmic Sum Rules: We introduce new sum rules allowing to determine universal properties of the\nunknown component of the cosmic rays and show how they can be used to predict\nthe positron fraction at energies not yet explored by current experiments and\nto constrain specific models." }, { "anchor": "T-violation in flavour oscillations as a test for relativity principles\n at a neutrino factory: We study the effects of violation of the equivalence principle (VEP) or\nviolation of Lorentz invariance (LIV) in the neutrino sector on the asymmetry\nbetween T-conjugate oscillation probabilities, $\\Delta P_T \\equiv\nP(\\nu_{\\alpha} \\to \\nu_{\\beta}) - P(\\nu_{\\beta} \\to \\nu_{\\alpha})$, in a\nthree-flavour framework. We find that additional mixing due to these\nmechanisms, while obeying all present bounds, can lead to an observable\nenhancement, suppression, and/or sign change in $\\Delta P_T$ for the preferred\nenergies and baselines of a neutrino factory. The measurement of this asymmetry\ncan be used to establish a new upper limit of order $10^{-26}$ on VEP or LIV in\nthe $(\\nu_e, \\nu_\\mu)$ and $(\\nu_e, \\nu_\\tau)$ sectors.", "positive": "Skewness of the elliptic flow distribution in\n $\\sqrt{s_{_{\\mathrm{NN}}}}$ = 5.02~TeV PbPb collisions from HYDJET++ model: The elliptic flow ($v_{2}$) event-by-event fluctuations in PbPb collisions at\n5.02~TeV are analyzed within the HYDJET++ model. Using the multi-particle, so\ncalled Q-cumulant method, $v_{2}\\{2\\}$, $v_{2}\\{4\\}$, $v_{2}\\{6\\}$ and\n$v_{2}\\{8\\}$ are calculated and used to study their ratios and to construct\nskewness ($\\gamma^{exp}_{1}$) as a measure of the asymmetry of the elliptic\nflow distribution. Additionally, in order to check if there is a hydrodynamics\nnature in the elliptic collectivity generated by the HYDJET++ model, the ratio\nof $v_{2}\\{6\\} - v_{2}\\{8\\}$ and $v_{2}\\{4\\} - v_{2}\\{6\\}$ distribution is\ncalculated. The analysis is performed as a function of the collision\ncentrality. In order to check the HYDJET++ model responses, the results of this\nanalysis are compared to the corresponding experimental measurements by CMS. A\ngood qualitative and rather good quantitative agreement is found." }, { "anchor": "K_l3 form factors at order p^6 in chiral perturbation theory: This paper describes the calculation of the semileptonic K_l3 decay form\nfactor at order p^6 of chiral perturbation theory which is the next-to-leading\norder correction to the well-known p^4 result achieved by Gasser and Leutwyler.\nAt order p^6 the chiral expansion contains 1- and 2-loop diagrams which are\ndiscussed in detail. The irreducible 2-loop graphs of the sunset topology are\ncalculated numerically. In addition, the chiral Lagrangian L^6 produces direct\ncouplings with the W-bosons. Due to these unknown couplings, one can always add\nlinear terms in q^2 to the predictions of the form factor f_-(q^2). For the\nform factor f_+(q^2), this ambiguity involves even quadratic terms. Making use\nof the fact that the pion electromagnetic form factor involves the same q^4\ncounter term, the q^4-ambiguity can be resolved. Apart from the possibility of\nadding an arbitrary linear term in q^2 our calculation shows that chiral\nperturbation theory converges very well in this application, as the O(p^6)\ncorrections are small. Comparing the predictions of chiral perturbation theory\nwith the recent CPLEAR data, it is seen that the experimental form factor\nf_+(q^2) is well described by a linear fit, but that the slope lambda_+ is\nsmaller by about 2 standard deviations than the O(p^4) prediction. The\nunavoidable q^2 counter term of the O(p^6) corrections allows to bring the\npredictions of chiral perturbation theory into perfect agreement with\nexperiment.", "positive": "Characteristics of Strange Hadron Production in Some High Energy\n Collisions and The Role of Power Laws: Studies on `strange' particle production have always occupied a very\nimportant space in the domain of Particle Physics. This was and is so, just\nbecause of some conjectures about specially abundant or excess production of\n`strange' particles, at certain stages and under certain conditions arising out\nof what goes by the name of `Standard' model in Particle Physics. With the help\nof Hagedornian power laws we have attempted to understand and interpret here\nthe nature of the $p_T$-spectra for the strange particle production in a few\nhigh energy nuclear collisions, some interesting ratio-behaviours and the\ncharacteristics of the nuclear modification factors that are measured in\nlaboratory experiments. After obtaining and analysing the final results we do\nnot confront any peculiarities or oddities or extraneous excesses in the\nproperties of the relevant observables with no left-over problems or puzzles.\nThe model(s) used by us work(s) quite well for explaining the measured data." }, { "anchor": "Quantum Parton Shower with Kinematics: Parton showers which can efficiently incorporate quantum interference effects\nhave been shown to be run efficiently on quantum computers. However, so far\nthese quantum parton showers did not include the full kinematical information\nrequired to reconstruct an event, which in classical parton showers requires\nthe use of a veto algorithm. In this work, we show that adding one extra\nassumption about the discretization of the evolution variable allows to\nconstruct a quantum veto algorithm, which reproduces the full quantum\ninterference in the event, and allows to include kinematical effects. We\nfinally show that for certain initial states the quantum interference effects\ngenerated in this veto algorithm are classically tractable, such that an\nefficient classical algorithm can be devised.", "positive": "Chiral-symmetry breaking and confinement in Minkowski space: We present a model for the quark-antiquark interaction formulated in\nMinkowski space using the Covariant Spectator Theory. The quark propagators are\ndressed with the same kernel that describes the interaction between different\nquarks. By applying the axial-vector Ward-Takahashi identity we show that our\nmodel satisfies the Adler-zero constraint imposed by chiral symmetry. For this\nmodel, our Minkowski-space results of the dressed quark mass function are\ncompared to lattice QCD data obtained in Euclidean space. The mass function is\nthen used in the calculation of the electromagnetic pion form factor in\nrelativistic impulse approximation, and the results are presented and compared\nwith the experimental data from JLab." }, { "anchor": "Charged right-handed Higgsino field contribution to the chargino mass\n spectrum and inverse parameter problem in Left-Right Supersymmetric Models: The contribution of the charged right-handed higgsino fields to the chargino\nmass spectrum in the context of the Left-Right Supersymmetric Model is studied.\nAnalytical expressions for the chargino masses assuming arbitrary CP-violating\nphases are given. Also, the corresponding inverse parameter problem is studied.\nAnalytical disentangling of some relevant parameters is presented. A general\ninversion algorithm, based on suitable measurement of cross-section type\nobservables associated to chargino pair production in electron positron\nannihilation, is proposed.", "positive": "Phenomenology of SIDIS unpolarized cross sections and azimuthal\n asymmetries: I review the phenomenology of unpolarized cross sections and azimuthal\nasymmetries in semi-inclusive deeply inelastic scattering (SIDIS). The general\ntheoretical framework is presented and the validity of the Gaussian model is\ndiscussed. A brief account of the existing analyses is provided." }, { "anchor": "Hydrodynamics with a chiral hadronic equation of state including quark\n degrees of freedom: We investigate the influence of a deconfinement phase transition on the\ndynamics of hot and dense nuclear matter. We apply a hybrid model where an\nintermediate hydrodynamics stage is employed for the the hot and dense stage of\na system created in head-on collisions of Pb+Pb/Au+Au at beam energies from\n$2-160A $GeV. The initial and final interactions are performed by a microscopic\ntransport approach (UrQMD). An equation of state that incorporates a critical\nend point (CEP) in line with lattice data is used. It follows from coupling the\nPolyakov loop (as an order parameter for deconfinement) to a chiral hadronic\n$SU(3)_f$ model. In this configuration the EoS describes chiral restoration as\nwell as the deconfinemt phase transition. We compare the results obtained in\nthis approach to results from a non interacting hadron resonance gas, focussing\non observables deemed to be sensitive to the phase transition to the quark\ngluon plasma.", "positive": "Fourth-order QCD renormalization group quantities in the {\\rm{V}}-scheme\n and the relation of the $\u03b2$-function to the Gell-Mann--Low function in\n QED: The semi-analytical $O(\\alpha_s^4)$ expression for the renormalization group\n$\\beta$-function in the ${\\rm{V}}$-scheme is obtained in the case of the\n$SU(N_c)$ gauge group. In the process of calculations we use the existing\ninformation about the three-loop perturbative approximation for the QCD static\npotential, evaluated in the $\\rm{\\overline{MS}}$-scheme. The comparison of the\nnumerical values of the third and fourth coefficients for the QCD RG $\\beta$-\nfunctions in the gauge-independent ${\\rm{V}}$- and $\\rm{\\overline{MS}}$-schemes\nand in minimal MOM scheme in the the Landau gauge is presented. The\nphenomenologically-oriented comparisons for the coefficients of $O(\\alpha_s^4)$\nexpression for the $e^+e^-$-annihilation R-ratio in these schemes are\npresented. It is shown, that taking into account of these QCD contributions are\nof vital importance and lead to the drastic decrease of the scheme-dependence\nambiguities of the fourth-order perturbative QCD approximations for the\n$e^+e^-$ annihilation R-ratio for the number of active flavours,$n_f=5$ in\nparticular. We demonstrate that in the case of QED with $N$-types of leptons\nthe coefficients of the $\\beta^{\\rm{V}}$-function are closely related to the\nones of the Gell-Mann--Low $\\Psi$-function and emphasise that they start to\ndiffer from each other at the fourth order due to the appearance of the extra\n$N^2$-contribution in the V-scheme. The source of this extra correction is\nclarified. The general all-order QED relations between the coefficients of the\n$\\beta^{\\rm{V}}$- and $\\Psi$-functions are discussed." }, { "anchor": "Upper bound on Hot Dark Matter Density from $SO(10)$ Yukawa Unification: We study low-energy consequences of supersymmetric $SO(10)$ models with\nYukawa unification $h_t = h_N$ and $h_b = h_\\tau$. We find that it is difficult\nto reproduce the observed $m_b/m_\\tau$ ratio when the third-generation\nright-handed neutrino is at an intermediate scale, especially for small $\\tan\n\\beta$. We obtain a conservative lower bound on the mass of the right-handed\nneutrino $M_N > 6 \\times 10^{13}$~GeV for $\\tan \\beta < 10$. This bound\ntranslates into an upper bound on the $\\tau$-neutrino mass, and therefore on\nits contribution to the hot dark matter density of the present universe,\n$\\Omega_\\nu h^2 < 0.004$. Our analysis is based on the full two-loop\nrenormalization group equations with one-loop threshold effects. However, we\nalso point out that physics above the GUT-scale could modify the Yukawa\nunification condition $h_b = h_\\tau$ for $\\tan \\beta \\lsim 10$. This might\naffect the prediction of $m_b/m_\\tau$ and the constraint on $M_N$.", "positive": "Analysis of BaBar data for three meson tau decay modes using the Tauola\n generator: The hadronic current for the $\\tau^- \\to \\pi^-\\pi^+\\pi^-\\nu_\\tau$ decay\ncalculated in the framework of the Resonance Chiral Theory with an additional\nmodification to include the $\\sigma$ meson is described. Implementation into\nthe Monte Carlo generator Tauola and fitting strategy to get the model\nparameters using the one-dimensional distributions are discussed. The results\nof the fit to one-dimensional mass invariant spectrum of the BaBar data are\npresented." }, { "anchor": "Entropy in hadron-hadron collisions: We analyse the entropy properties in the proton-proton 1800 GeV events from\nthe PYTHIA/JETSET Monte Carlo generator following a recent proposal concerning\nthe measurement of entropy in multiparticle systems. The dependence on the\nnumber of bins and on the size of the phase-space region is investigated. Our\nresults may serve as a reference sample for experimental data from\nhadron-hadron and heavy ion collisions.", "positive": "CP Violation and Rare Decays of K and B Mesons: These lectures describe CP violation and rare decays of K and B mesons and\nconsist of ten chapters: i) Grand view of the field including CKM matrix and\nthe unitarity triangle, ii) General aspects of the theoretical framework, iii)\nParticle-antiparticle mixing and CP violation, iv) Standard analysis of the\nunitarity triangle, v) The ratio epsilon'/epsilon including most recent\ndevelopments, vi) Rare decays K^+ -> pi^+ nu barnu and K_L -> pi^0 nu barnu,\nvii) Express review of other rare decays, viii) Express review of CP violation\nin B decays, ix) A brief look beyond the Standard Model including connections\nbetween epsilon'/epsilon and CP violating rare K decays, x) Final messages." }, { "anchor": "An AdS/QCD model from Sen's tachyon action: We construct a new, simple phenomenological model along the lines of AdS/QCD.\nThe essential new ingredient is the brane-antibrane effective action including\nthe open string tachyon proposed by Sen. Chiral symmetry breaking happens\nbecause of tachyon dynamics. We fit a large number of low-spin meson masses at\nthe 10%-15% level. The only free parameters involved in the fits correspond to\nthe overall QCD-scale and the quark masses. Several aspects of previous models\nare qualitatively improved.", "positive": "One-loop Single Real Emission Contributions to Inclusive Higgs\n Production at NNNLO: I discuss the contributions of the one-loop single-real-emission amplitudes,\n$gg\\to H g$, $qg\\to H q$, etc. to inclusive Higgs boson production through\nnext-to-next-to-next-to-leading order in the strong coupling." }, { "anchor": "Unified treatment of $A+B\\to 0 $ and $A+A\\to 0$ chemical reactions\n through Thompson's approach: In this work we propose an action to describe diffusion limited chemical\nreactions belonging to various classes of universality. This action is treated\nthrough Thompson's approach and can encompass both cases where we have\nsegregation as in the $A+B\\to 0$ reaction, as well the simplest one, namely the\n$A+A\\to 0$ reaction .Our results for long time and long wavelength behaviors of\nthe species concentrations and reaction rates agree with exact results of\nPeliti for $A+A\\to 0$ reaction and rigorous results of Bramson and Lebowitz for\n$A+B\\to 0$ reaction, with equal initial concentrations.The different classes of\nuniversality are reflected by the obtained upper critical dimensions varying\ncontinuously from $d_{c}=2$ in the first case to $d_{c}=4$ in the last one.\nJust at the upper critical dimensions we find universal logarithmic corrections\nto the mean field behavior.", "positive": "Electron EDM and Muon anomalous magnetic moment in Two-Higgs-Doublet\n Models: The CP violating two-Higgs doublet model of type-X may enhance significantly\nthe electric and magnetic moment of leptons through two-loop Barr-Zee diagrams.\nWe analyze the general parameter space of the type-X 2HDM consistent with the\nmuon $g-2$ and the electron EDM measurements to show how strongly the CP\nviolating parameter is constrained in the region explaining the muon $ g-2$\nanomaly." }, { "anchor": "RADGEN 1.0. Monte Carlo Generator for Radiative Events in DIS on\n Polarized and Unpolarized Targets: A new Monte-Carlo generator including real radiated photons in DIS on\npolarized and unpolarized targets is presented. Analytical and numerical tests\nare performed and discussed in details.", "positive": "QCD estimate of the long-distance effect in $B \\to K^* \u03b3$: We suggest to use operator product expansion and QCD sum rule techniques to\nestimate the long-distance contribution to the amplitude of the exclusive rare\ndecay $B\\to K^* \\gamma$. In contrast to a phenomenological description in terms\nof $\\psi$ resonances converting into a photon, the virtual charm quark loop\ninteracting with soft gluons is represented by a new quark-gluon-photon\noperator. The matrix element of this operator is calculated in the same\napproximation as the matrix element of the leading magnetic penguin operator.\nThe overall correction is found to be small, not more than about 5%." }, { "anchor": "RPA-Approach to the Excitations of the Nucleon, Part I: Theory: In this paper we develop a theoretical framework which allows us to study\nexcitations of the nucleon. Assuming an effective two-body interaction as a\nmodel for low-energy QCD, we derive a relativistic TDHF equation for a\nmany-body system of quarks. To render the Dirac-sea contribution tothe mean\nfield finite, we introduce a symmetry conserving regularization scheme. In the\nsmall amplitude limit we derive an RPA equation. The structure of the $ph$\ninteraction and modifications due to the regularization scheme are discussed.\nWe give a prescription to obtain a nucleon state with good angular momentum (J)\nand isospin (T) quantum numbers on mean-field level. To study excitations, we\ndevelop a tensor-RPA approach, which is an extension of the conventional RPA\ntechniques to systems with a nonscalar ground state. This allows us to\nconstruct excited states with good (J/T) quantum numbers. We discuss a method\nto reduce the overcomplete $ph$-space and compute the tensor-RPA interaction\nmatrix elements. Finally we extend our scheme to include ({3/2}^+,\n{3/2})-states.", "positive": "Cosmological Constraints on Very Dark Photons: We explore the cosmological consequences of kinetically mixed dark photons\nwith a mass between 1 MeV and 10 GeV, and an effective electromagnetic fine\nstructure constant as small as $10^{-38}$. We calculate the freeze-in abundance\nof these dark photons in the early Universe and explore the impact of late\ndecays on BBN and the CMB. This leads to new constraints on the parameter space\nof mass $m_V$ vs kinetic mixing parameter $\\kappa$." }, { "anchor": "The Hadronic Contribution to the Muon g-2: The evaluation of the hadronic contribution to the muon magnetic anomaly a_mu\nis reviewed, including a new estimate using precise results on the pi+pi-\nspectral function from the KLOE Collaboration. It is found that the KLOE data\nconfirm to some extent the previous e+e- annihilation data in this channel, and\naccentuate the disagreement with the isospin-breaking-corrected spectral\nfunction from tau- -> pi-pi0 nu decays. Correcting for the empirical difference\nin the mass of the charged and the neutral rho locally improves, but does not\nresolve this discrepancy. A preliminary reevaluation (including the KLOE data)\nof the e+e- -based Standard Model prediction of a_mu results in a deviation of\n2.7 standard deviations from the BNL measurement.", "positive": "The Standard Model and the Generalized Covariant Derivative: The generalized covariant derivative, that uses both scalar and vector\nbosons, is defined. It is shown how a grand unified theory of the Standard\nModel can be constructed using a generalized Yang-Mills theory." }, { "anchor": "Helicity Evolution at Small $x$: Flavor Singlet and Non-Singlet\n Observables: We extend our earlier results for the quark helicity evolution at small $x$\nto derive the small-$x$ asymptotics of the flavor singlet and flavor\nnon-singlet quark helicity TMDs and PDFs and of the $g_1$ structure function.\nIn the flavor singlet case we re-derive the evolution equations obtained in our\nprevious paper on the subject, performing additional cross-checks of our\nresults. In the flavor non-singlet case we construct new small-$x$ evolution\nequations by employing the large-$N_c$ limit. All evolution equations resum\ndouble-logarithmic powers of $\\alpha_s \\, \\ln^2 (1/x)$ in the\npolarization-dependent evolution along with the single-logarithmic powers of\n$\\alpha_s \\, \\ln (1/x)$ in the unpolarized evolution which includes saturation\neffects. We solve the linearized flavor non-singlet equation analytically,\nobtaining an intercept which agrees with the one calculated earlier by Bartels,\nErmolaev and Ryskin using the infra-red evolution equations. Our numerical\nsolution of the linearized large-$N_c$ evolution equations for the flavor\nsinglet case is presented in the accompanying Letter and is further discussed\nhere.", "positive": "Radiative bound-state-formation cross-sections for dark matter\n interacting via a Yukawa potential: We calculate the cross-sections for the radiative formation of bound states\nby dark matter whose interactions are described in the non-relativistic regime\nby a Yukawa potential. These cross-sections are important for cosmological and\nphenomenological studies of dark matter with long-range interactions, residing\nin a hidden sector, as well as for TeV-scale WIMP dark matter. We provide the\nleading-order contributions to the cross-sections for the dominant capture\nprocesses occurring via emission of a vector or a scalar boson. We offer a\ndetailed inspection of their features, including their velocity dependence\nwithin and outside the Coulomb regime, and their resonance structure. For pairs\nof annihilating particles, we compare bound-state formation with annihilation." }, { "anchor": "The longitudinal structure function F_L: perturbative QCD and\n k_T-factorization versus experimental data at fixed W: We use results for the structure functions $F_L$ for a gluon target having\nnonzero transverse momentum square at order $\\alpha_s$, obtained in our\nprevious paper, to compare with recent H1 experimental data for $F_L$ at fixwd\nW values and with collinear GRV predictions at LO and NLO approximation.", "positive": "The 3-loop QCD calculation of the moments of deep inelastic structure\n functions: We present the analytic next-to-next-to-leading perturbative QCD corrections\nin the leading twist approximation for the moments N=2,4,6,8 of the flavour\nsinglet deep inelastic structure functions F_2 and F_L. We calculate the\nthree-loop anomalous dimensions of the corresponding singlet operators and the\nthree-loop coefficient functions of the structure functions F_L and F_2. In\naddition, we obtained the 10th moment for the non-singlet structure functions\nin the same order of perturbative QCD. We perform an analysis of the obtained\nresults." }, { "anchor": "Impact of Torsion Space-Time on $t\\bar{t}$ observables at Hadron\n Colliders: Starting from the effective torsion space-time model, we study its effects on\nthe top pair production cross section at hadron colliders. We also study the\neffect of this model on top pair asymmetries at the Tevatron and the LHC. We\nfind that torsion space-time can explain forward-backward asymmetry according\nto measured anomaly at Tevatron. We find an allowed region in the parameters\nspace which can satisfy simultaneously all $t\\bar{t}$ observables measured at\nTevatron and LHC.", "positive": "Search for single production of a top quark partner via the $T\\to th$\n and $h\\to WW^{\\ast}$ channels at the LHC: Many scenarios of physics beyond the Standard Model that address the\nhierarchy problem also predict the existence of vector-like top quark partners,\nwhich are generally expected around the TeV scale. In this paper, we propose to\nsearch for a vector-like top quark partner with charge $2/3$ in a simplified\nmodel including only two free parameters, the coupling constant $g^{\\ast}$ and\ntop quark partner mass $m_T$. We investigate the observability of the top quark\npartner through the process $pp \\to T(\\to th)j\\to t(\\to b W^+\\to b \\ell^{+}\n\\nu_{\\ell})h( \\to WW^{\\ast}\\to \\ell^{+}\\nu\\ell^{-}\\bar{\\nu}) j$, where $T$ is\nthe heavy top quark partner and $h$ the SM-like Higgs boson, at the Large\nHadron Collider (LHC). The discovery prospects and exclusion limits on the\nparameter plane defined by ($m_T,g^{\\ast}$) are obtained for the already\nscheduled LHC runs as well as at the future High-Luminosity~LHC (HL-LHC). The\nconstraints and projected sensitivities are also interpreted in a realistic\nmodel, i.e., the minimal Composite Higgs Model with singlet top quark partners.\nWe finally also analyze the projected sensitivity in terms of the production\ncross section times branching fraction at the (HL-)LHC." }, { "anchor": "The sign of the day-night asymmetry for solar neutrinos: A qualitative understanding of the day-night asymmetry for solar neutrinos is\nprovided. The greater night flux in nu_e is seen to be a consequence of the\nfact that the matter effect in the sun and that in the earth have the same\nsign. It is shown in the adiabatic approximation for the sun that for all\nvalues of the mixing angle theta_V between 0 and pi/2, the night flux of\nneutrinos is greater than the day flux. Only for small values of theta_V where\nthe adiabatic approximation badly fails does the sign of the day-night\nasymmetry reverse.", "positive": "Detecting the radiative decay of the cosmic neutrino background with\n line-intensity mapping: We study the possibility to use line-intensity mapping (LIM) to seek photons\nfrom the radiative decay of neutrinos in the cosmic neutrino background. The\nStandard Model prediction for the rate for these decays is extremely small, but\nit can be enhanced if new physics increases the neutrino electromagnetic\nmoments. The decay photons will appear as an interloper of astrophysical\nspectral lines. We propose that the neutrino-decay line can be identified with\nanisotropies in LIM clustering and also with the voxel intensity distribution.\nOngoing and future LIM experiments will have -- depending on the neutrino\nhierarchy, transition and experiment considered -- a sensitivity to an\neffective electromagnetic transition moment $\\sim 10^{-12}\\, -\\,10^{-8}\\,\n(m_ic^2/{0.1 \\rm eV})^{3/2}\\mu_{\\rm B}$, where $m_i$ is the mass of the\ndecaying neutrino and $\\mu_{\\rm B}$ is the Bohr magneton. This will be\nsignificantly more sensitive than cosmic microwave background spectral\ndistortions, and it will be competitive with stellar cooling studies. As a\nbyproduct, we also report an analytic form of the one-point probability\ndistribution function for neutrino-density fluctuations, obtained from the\nQuijote simulations using symbolic regression." }, { "anchor": "Improvement of Renormalization-Scale Uncertainties Within Empirical\n Determinations of the b-Quark Mass: Accurate determinations of the MS-bar b-quark mass $m_b(m_b)$ from\n$\\sigma(e^+e^-\\to{\\rm hadrons})$ experimental data currently contain three\ncomparable sources of uncertainty; the experimental uncertainty from moments of\nthis cross-section, the uncertainty associated with $\\alpha_s(M_z)$, and the\ntheoretical uncertainty associated with the renormalization scale. Through\nresummation of all logarithmic terms explicitly determined in the perturbative\nseries by the renormalization-group (RG) equation, it is shown that the\nrenormalization-scale dependence is virtually eliminated as a source of\ntheoretical uncertainty in $m_b(m_b)$. This resummation also reduces the\nestimated effect of higher-loop perturbative contributions, further reducing\nthe theoretical uncertainties in $m_b(m_b)$. Furthermore, such resummation\ntechniques improve the agreement between the values of the MS-bar b-quark mass\nextracted from the various moments of $R(s)=\\sigma(e^+e^-\\to{\\rm\nhadrons})/\\sigma_{pt}$ [$\\sigma_{pt}=4\\pi\\alpha^2/(3s)$], obviating the need to\nchoose an optimummoment for determining $m_b(m_b)$. Resummation techniques are\nalso shown to reduce renormalization-scale dependence in the relation between\nb-quark MS-bar and pole mass and in the relation between the pole and $1S$\nmass.", "positive": "Implications of the 750 GeV Diphoton Excess in Gaugino Mediation: The 750 GeV diphoton excess reported by ATLAS and CMS indicates the presence\nof several pairs of the vector-like matter multiplets around TeV scale. If that\nis the case, radiative corrections from the $SU(3)$ gauge interaction\nsignificantly change from those of MSSM, and the infrared-free nature of the\ngauge interaction leads to characteristic SUSY mass spectra: a ratio of a\nsquark mass to the gluino mass, and scalar trilinear couplings are enhanced at\nthe low-energy scale. Consequently, even in gaugino mediation models, the Higgs\nboson mass of 125 GeV is explained with the fairly light gluino of 2-3 TeV,\nwhich can be accessible at the LHC." }, { "anchor": "Searching a systematics for nonfactorizable contribution to B-and B0\n mesons: Two-body weak decays / and are examined under isospin analysis to study\nnonfactorizable contributions. After extracting the strong phases and obtaining\nthe factorizable contributions from spectator-quark diagrams for Nc=3, we\ndetermine nonfactorizable isospin amplitudes from the experimental data for\nthese modes. Our results support the universality of ratio of nonfactorizable\nisospin reduced amplitudes for these decays within experimental errors. In\norder to show that this systematics is not coincidental, we also plot our\nresults w. r. t. this ratio.", "positive": "Probability Distribution Function of the Coarse-grained Scalar Field at\n Finite Temperature: We present a formalism to calculate the probability distribution function of\na scalar field coarse-grained over some spatial scales with a Gaussian filter\nat finite temperature. As an application, we investigate the role of\nsubcritical fluctuations in the electroweak phase transition in the minimal\nstandard model. It is concluded that the universe was in a mixed state of true\nand false vacua already at the critical temperature." }, { "anchor": "Solar neutrino oscillations in the quasi-vacuum regime: Motivated by recent experimental data, we study solar neutrino oscillations\nin the range 10^-10 < delta m^2/E < 10^-7 eV^2/MeV. In this range vacuum\noscillations become increasingly affected by (solar and terrestrial) matter\neffects for increasing delta m^2, smoothly reaching the MSW regime. A numerical\nstudy of matter effects in such \"quasi-vacuum\" regime is performed. The results\nare applied to the analysis of the recent solar neutrino phenomenology.", "positive": "P-wave Quarkonium Decays to Meson Pairs: The processes of P-wave Quarkonium exclusive decays to two mesons are\ninvestigated, in which the final state vector mesons with various polarizations\nare considered separately. In the calculation, the initial heavy quarkonia are\ntreated in the framework of non-relativistic quantum chromodynamics, whereas\nfor light mesons, the light cone distribution amplitudes up to twist-3 are\nemployed. It turns out that the higher twist contribution is significant and\nprovides a possible explanation for the observation of the hadron helicity\nselection rule violated processes $\\chi_{c1}\\rightarrow \\phi\\phi,\\omega\\omega$\nby the BESIII collaboration in recently. We also evaluate the $\\chi_{b1}\\to\nJ/\\psi J/\\psi$ process and find that its branching ratio is big enough to be\nmeasured at the B-factories." }, { "anchor": "QED in finite volume and finite size scaling effect on electromagnetic\n properties of hadrons: On account of its application to the present and future analysis of the\nvirtual photon correction to the hadronic properties by means of lattice QCD\nsimulation, we initiate the study of the finite size scaling effect on the QED\ncorrection using low energy effective theory of QCD with QED. For this purpose,\nwe begin with formulating a new QED on the space with finite volume. By\nadapting this formalism to the partially quenched QCD with electromagnetism, we\nexplore the qualitative features of the finite size scaling effect on the\nelectromagnetic correction to the masses of pseudo-Goldstone bosons.", "positive": "Origins of the Isospin Violation of Dark Matter Interactions: Light dark matter (DM) with a large DM-nucleon spin-independent cross section\nand furthermore proper isospin violation (ISV) $f_n/f_p\\approx-0.7$ may provide\na way to understand the confusing DM direct detection results. Combing with the\nstringent astrophysical and collider constraints, we systematically investigate\nthe origin of ISV first via general operator analyses and further via\nspecifying three kinds of (single) mediators: A light $Z'$ from chiral\n$U(1)_X$, an approximate spectator Higgs doublet (It can explain the $W+jj$\nanomaly simultaneously) and color triplets. In addition, although $Z'$ from an\nexotic $U(1)_X$ mixing with $U(1)_Y$ generating $f_n=0$, we can combine it with\nthe conventional Higgs to achieve proper ISV. As a concrete example, we propose\nthe $U(1)_X$ model where the $U(1)_X$ charged light sneutrino is the inelastic\nDM, which dominantly annihilates to light dark states such as $Z'$ with sub-GeV\nmass. This model can address the recent GoGeNT annual modulation consistent\nwith other DM direct detection results and free of exclusions." }, { "anchor": "Leading Nucleon Form Factors in Single Gauge Boson Exchange\n Approximation: We provide a complete calculation of all leading nucleon form factors at\nlarge momentum transfer and in single gauge boson exchange approximation. In\norder to evaluate the required nucleon transition probability matrix elements,\nwe combine QCD perturbation theory with an expansion in nucleon distribution\namplitudes. Using leading twist nucleon distribution amplitudes only, one\nobtains the desired nucleon form factors. The obtained results are consistent\nwith experimental data when we use third order polynomials for the distribution\namplitudes and non-perturbative models for the coefficients. Finally, we\ncompare our results for the Dirac form factor of the proton with previous\nresults based on the QCD factorization theorem, where a discrepancy about the\ncorrect symmetry factor is still under discussion. We examine the calculations\nand propose an explanation.", "positive": "Heavy Quark Vacuum Polarization Function at O(alpha_s^2) and\n O(alpha_s^3): We determine the full mass and $q^2$ dependence of the heavy quark vacuum\npolarization function $\\Pi(q^2)$ and its contribution to the total $e^+e^-$\ncross section at ${\\cal O}(\\alpha_s^2)$ and ${\\cal O}(\\alpha_s^3)$ in\nperturbative QCD. We use known results for the expansions of $\\Pi(q^2)$ at high\nenergies, in the threshold region and around $q^2=0$, conformal mapping and the\nPad\\'e approximation method. From our results for $\\Pi(q^2)$ we determine\nnumerically at ${\\cal O}(\\alpha_s^3)$ the previously unknown non-logarithmic\ncontributions in the high-energy expansion at order $(m^2/q^2)^i$ for $i=0,1$\nand the coefficients in the expansion around $q^2=0$ at order $q^{2n}$ with\n$n\\ge 2$. We also determine at ${\\cal O}(\\alpha_s^2)$ the previously unknown\n${\\cal O}(v^0)$ constant term in the expansion of $\\Pi(q^2)$ in the threshold\nregion, where $v$ is the quark velocity. Our method allows for a quantitative\nestimate of uncertainties and can be systematically improved once more\ninformation in the three kinematic regions becomes available by future\nmulti-loop computations. For the contributions to the total $e^+e^-$ cross\nsection at ${\\cal O}(\\alpha_s^2)$ we confirm results obtained earlier by\nChetyrkin, K\\\"uhn and Steinhauser." }, { "anchor": "DM-electron scattering in materials: sum rules and heterostructures: In recent years, a growing experimental program has begun to search for\nsub-GeV dark matter through its scattering with electrons. An associated\ntheoretical challenge is to compute the dark matter scattering rate in\nexperimental targets, and to find materials with large scattering rates. In\nthis paper we point out that, if dark matter scatters through a mediator that\ncouples to EM charge, then electromagnetic sum rules place limits on the\nachievable scattering rates. These limits serve as a useful sanity check for\ncalculations, as well as setting a theoretical target for proposed detection\nmethods. Motivated by this analysis, we explore how conductor-dielectric\nheterostructures can result in enhanced scattering rates compared to bulk\nconductors, for dark matter masses $\\lesssim$ MeV. These effects could be\nespecially important in computing the scattering rates from thin-film targets,\ne.g. superconducting detectors such as SNSPDs, TESs or MKIDs, for which the\nscattering rate could be enhanced by orders of magnitude at low enough dark\nmatter masses, as well as introducing or enhancing directional dependence.", "positive": "Natural Four-Generation Mass Textures in MSSM Brane Worlds: A fourth generation of Standard Model (SM) fermions is usually considered\nunlikely due to constraints from direct searches, electroweak precision\nmeasurements, and perturbative unitarity. We show that fermion mass textures\nconsistent with all constraints may be obtained naturally in a model with four\ngenerations constructed from intersecting D6 branes on a T^6/(Z_2 x Z_2)\norientifold. The Yukawa matrices of the model are rank 2, so that only the\nthird- and fourth-generation fermions obtain masses at the trilinear level. The\nfirst two generations obtain masses via higher-order couplings and are\ntherefore naturally lighter. In addition, we find that the third and fourth\ngeneration automatically split in mass, but do not mix at leading order.\nFurthermore, the SM gauge couplings automatically unify at the string scale,\nand all the hidden-sector gauge groups become confining in the range\n10^{13}--10^{16} GeV, so that the model becomes effectively a four-generation\nMSSM at low energies." }, { "anchor": "Baryogenesis and Dark Matter from $B$ Mesons: We present a new mechanism of Baryogenesis and dark matter production in\nwhich both the dark matter relic abundance and the baryon asymmetry arise from\nneutral $B$ meson oscillations and subsequent decays. This set-up is testable\nat hadron colliders and $B$-factories. In the early Universe, decays of a long\nlived particle produce $B$ mesons and anti-mesons out of thermal equilibrium.\nThese mesons/anti-mesons then undergo CP violating oscillations before quickly\ndecaying into visible and dark sector particles. Dark matter will be charged\nunder Baryon number so that the visible sector baryon asymmetry is produced\nwithout violating the total baryon number of the Universe. The produced baryon\nasymmetry will be directly related to the leptonic charge asymmetry in neutral\n$B$ decays; an experimental observable. Dark matter is stabilized by an\nunbroken discrete symmetry, and proton decay is simply evaded by kinematics. We\nwill illustrate this mechanism with a model that is unconstrained by di-nucleon\ndecay, does not require a high reheat temperature, and would have unique\nexperimental signals -- a positive leptonic asymmetry in $B$ meson decays, a\nnew decay of $B$ mesons into a baryon and missing energy, and a new decay of\n$b$-flavored baryons into mesons and missing energy. These three observables\nare testable at current and upcoming collider experiments, allowing for a\ndistinct probe of this mechanism.", "positive": "Finding the Radiation Amplitude Zero in W\\GAMMA Production- is it Unique\n to the Standard Model?: In the light of recent experimental observation of the radiation amplitude\nzero (RAZ) in W\\gamma production by CDF at Fermilab, we consider its\nconsequences. is the RAZ unique to the standard model? Although it is not for\nneutrino-electron scattering, in the case of d-ubar scattering which is the\ncase of experimental interest, observation of the RAZ implies that the SM must\nbe correct." }, { "anchor": "The Last Gasp of Dark Matter Effective Theory: We discuss an interesting class of models, based on strongly coupled Dark\nMatter (DM), where sizable effects can be expected in LHC missing energy (MET)\nsearches, compatibly with a large separation of scales. In this case, an\neffective field theory (EFT) is appropriate (and sometimes necessary) to\ndescribe the most relevant interactions at the LHC. The selection rules implied\nby the structure of the new strong dynamics shape the EFT in an unusual way,\nrevealing the importance of higher-derivative interactions previously ignored.\nWe compare indications from relic density and direct detection experiments with\nconsistent LHC constraints, and asses the relative importance of the latter.\nOur analysis provides an interesting and well-motivated scenario to model MET\nat the LHC in terms of a handful of parameters.", "positive": "Borexino and General Neutrino Interactions: We derive constraints on all possible general neutrino-electron interactions\n(scalar, vector, pseudoscalar, axialvector and tensor) using the recent real\ntime Borexino event rate measurements of $pp$, $pep$ and $^{7}Be$ solar\nneutrinos. The limits improve several previous ones from TEXONO and CHARM-II\nfor incoming electron and muon neutrinos, and are the first ones for the tau\nflavor. Future improvements by next-generation solar neutrino experiments are\nalso studied. The limits extend the physics reach of solar neutrino\nmeasurements to TeV-scale physics. Finally, the different properties of the new\ninteractions for Dirac and Majorana neutrinos are discussed." }, { "anchor": "Coherent helicity amplitude for sequential decays: We present a derivation of coherent helicity amplitudes for a particle\ndecaying into multifinal states with nonzero spins. The results show that the\ncoherent amplitudes introduce additional rotations to transform the helicities\ninto a consistent helicity system, which allows us to add helicity amplitudes\nfor different decay chains coherently. These rotations may have significant\neffects on the interference between the decay chains in the partial wave\nanalysis.", "positive": "Wolfenstein Parametrization Re-examined: The Wolfenstein parametrization of the $3\\times 3$ Kobayashi-Maskawa (KM)\nmatrix $V$ is modified by keeping its unitarity up to the accuracy of\n$O(\\lambda^{6})$. This modification can self-consistently lead to the\noff-diagonal asymmetry of $V$: $|V_{ij}|^{2}-|V_{ji}|^{2}$ =\n$Z\\displaystyle\\sum_{k}\\epsilon^{~}_{ijk}$ with $Z=\\approx A^{2}\\lambda^{6}\n(1-2\\rho)$, which is comparable in magnitude with the Jarlskog parameter of\n$CP$ violation $J\\approx A^{2}\\lambda^{6}\\eta$. We constrain the ranges of $J$\nand $Z$ by using the current experimental data, and point out that the\npossibility of a symmetric KM matrix has almost been ruled out." }, { "anchor": "Using Atom Interferometery to Search for New Forces: Atom interferometry is a rapidly advancing field and this Letter proposes an\nexperiment based on existing technology that can search for new short distance\nforces. With current technology it is possible to improve the sensitivity by up\nto a factor of 10^2 and near-future advances will be able to rewrite the limits\nfor forces with ranges from 100 um to 1 km.", "positive": "Orbital angular momentum in the nucleons: In the last decade, it has been realized that the orbital angular momentum of\npartons inside the nucleon plays a major role. It contributes significantly to\nnucleon properties and is at the origin of many asymmetries observed in spin\nphysics. It is therefore of paramount importance to determine this quantity if\nwe want to understand the nucleon internal structure and experimental\nobservables. This triggered numerous discussions and controversies about the\nproper definition of orbital angular momentum and its extraction from\nexperimental data. We summarize the present situation and discuss recent\ndevelopments in this field." }, { "anchor": "Constraints from the $1/N_{\\rm c}$ Expansion on Properties of Exotic\n Tetraquark Mesons: Scrutinizing the scattering of ordinary mesons in the limiting case of the\nnumber of colour degrees of freedom $N_{\\rm c}$ of quantum chromodynamics\napproaching infinity, we formulate Feynman-diagram selection criteria and from\nthese deduce rigorous self-consistency conditions for the manifestation of a\ntetraquark, a two-quark-two-antiquark bound state, as a pole in the\ncorresponding amplitudes. Our constraints bear rather far-reaching\nconsequences: In particular, all flavour-exotic tetraquarks, composed of four\n(anti)quarks of disparate flavour, must come in, at least, two variants\ndiffering in (and thus readily identifiable by) the large-$N_{\\rm c}$ behaviour\nof their couplings to two ordinary mesons. Quite generally, irrespective of\ntheir flavour composition, all tetraquarks prove to be narrow. Their decay\nrates behave, for large $N_{\\rm c},$ like $1/N_{\\rm c}^2$ and thus decrease\nfaster than those of ordinary mesons.", "positive": "Multi-parton Cross Sections at Hadron Colliders: We present an alternative method to calculate cross sections for multi-parton\nscattering processes in the Standard Model at leading order. The helicity\namplitudes are computed using recursion relations in the number of particles,\nbased on Dyson-Schwinger equations whereas the summation over colour and\nhelicity configurations is performed by Monte Carlo methods. The computational\ncost of our algorithm grows asymptotically as 3^n, where n is the number of\nparticles involved in the process, as opposed to the n!-growth of the Feynman\ndiagram approach. Typical results for the total cross section, differential\ndistributions of invariant masses and transverse momenta of partons are\npresented and cross checked by explicit summation over colours." }, { "anchor": "Simple Modular invariant model for Quark, Lepton, and flavored-QCD axion: We propose a minimal extension of the Standard Model by incorporating sterile\nneutrinos and a QCD axion to account for the mass and mixing hierarchies of\nquarks and leptons and to solve the strong CP problem, and by introducing\n$G_{\\rm SM}\\times \\Gamma_N\\times U(1)_X$ symmetry. We demonstrate that the\nK{\\\"a}hler transformation corrects the weight of modular forms in the\nsuperpotential and show that the model is consistent with the modular and\n$U(1)_X$ anomaly-free conditions. This enables a simple construction of a\nmodular-independent superpotential for scalar potential. Using minimal\nsupermultiplets, we demonstrate a level 3 modular form-induced superpotential.\nSterile neutrinos explain small active neutrino masses via the seesaw mechanism\nand provide a well-motivated $U(1)_X$ breaking scale, whereas gauge singlet\nscalar fields play crucial roles in generating the QCD axion, heavy neutrino\nmass, and fermion mass hierarchy. The model predicts a range for the $U(1)_X$\nbreaking scale from $10^{13}$ GeV to $10^{15}$ GeV for $1\\,\\mbox{TeV}<\nm_{3/2}<10^6\\,\\mbox{TeV}$. In the supersymmetric limit, all Yukawa coefficients\nin the superpotential are given by complex numbers with an absolute value of\nunity, implying a democratic distribution. Performing numerical analysis, we\nstudy how model parameters are constrained by current experimental results. In\nparticular, the model predicts that the value of the quark Dirac CP phase falls\nbetween $38^\\circ$ to $87^\\circ$, which is consistent with experimental data,\nand the favored value of the neutrino Dirac CP phase is around $250^\\circ$.\nFurthermore, the model can be tested by ongoing and future experiments on axion\nsearches, neutrino oscillations, and $0\\nu\\beta\\beta$-decay.", "positive": "Dark Matter from Axion Strings with Adaptive Mesh Refinement: Axions are hypothetical particles that may explain the observed dark matter\n(DM) density and the non-observation of a neutron electric dipole moment. An\nincreasing number of axion laboratory searches are underway worldwide, but\nthese efforts are made difficult by the fact that the axion mass is largely\nunconstrained. If the axion is generated after inflation there is a unique mass\nthat gives rise to the observed DM abundance; due to nonlinearities and\ntopological defects known as strings, computing this mass accurately has been a\nchallenge for four decades. Recent works, making use of large static lattice\nsimulations, have led to largely disparate predictions for the axion mass,\nspanning the range from 25 microelectronvolts to over 500 microelectronvolts.\nIn this work we show that adaptive mesh refinement (AMR) simulations are better\nsuited for axion cosmology than the previously-used static lattice simulations\nbecause only the string cores require high spatial resolution. Using dedicated\nAMR simulations we obtain an over three order of magnitude leap in dynamic\nrange and provide evidence that axion strings radiate their energy with a\nscale-invariant spectrum, to within $\\sim$5% precision, leading to a mass\nprediction in the range (40,180) microelectronvolts." }, { "anchor": "Cosmology and direct detection of the Dark Axion Portal: The Dark Axion Portal provides a model for Dark Matter (DM) in which both\nDark Photons $\\gamma^\\prime$ and Axions $a$ can contribute to the present day\nabundance of DM. We study the parameter space of the Dark Axion Portal to\npinpoint regions of the parameter space where $\\gamma^\\prime$ and $a$ can be\nproduced with sufficient abundance to account for the cosmic DM density, while\nstill being detectable in planned direct detection and axion haloscope\nexperiments. In particular, we explore the production of eV-scale Dark Photons\nin the Dark Axion Portal, taking into account a possible kinetic mixing between\nthe dark and visible photons, which is essential for the detection of dark\nphotons through absorption in direct searches. We show that a non-zero kinetic\nmixing does not generally spoil the phenomenology of the model, leaving both\nthe axion and dark photon stable. Viable production mechanisms point to a\nsub-dominant population of dark photons making up $\\lesssim 10\\%$ of the DM,\nwith the remainder consisting of axion DM. Dark photons in the mass range\n$m_{\\gamma^\\prime} \\sim 20-200\\,\\mathrm{eV}$ and axions in the mass range $m_a\n\\sim 30 - 400\\,\\mu\\mathrm{eV}$ may be produced with these abundances\nself-consistently in the Dark Axion Portal and are within the reach of future\ndirect searches.", "positive": "Axions and Axion-Like Particles: The physics case for axions and axion-like particles is reviewed and an\noverview of ongoing and near-future laboratory searches is presented." }, { "anchor": "Charm quark transport in Pb+Pb reactions at sqrt{s}_NN=2.76 TeV from a\n (3+1) dimensional hybrid approach: We implement a Langevin approach for the transport of charm quarks in the\nUrQMD (hydrodynamics + Boltzmann) hybrid model. Due to the inclusion of\nevent-by-event fluctuations and a full (3+1) dimensional hydrodynamic\nevolution, this approach provides a more realistic model for the evolution of\nthe matter produced in heavy ion collisions as compared to simple homogeneous\nfireball expansions usually employed. As drag and diffusion coefficients we use\na resonance approach for elastic heavy-quark scattering and assume a decoupling\ntemperature of the charm quarks from the hot medium of 130 MeV. A coalescence\napproach at the decoupling temperature for the hadronization of the charm\nquarks to D-mesons is also included. We present calculations of the nuclear\nmodification factor R_AA as well as the elliptic flow v_2 in Pb+Pb collisions\nat sqrt s_NN=2.76 TeV. The comparison to ALICE measurements shows a very good\nagreement with our calculations.", "positive": "The non-forward BFKL amplitude and rapidity gap physics: We discuss the BFKL approach to processes with large momentum transferred\nthrough a rapidity gap. The Mueller and Tang scheme to the BFKL non-forward\nparton-parton elastic scattering amplitude at large $t$, is extended to include\nhigher conformal spins. The new contributions are found to decrease with\nincreasing energy, as follows from the gluon reggeisation phenomenon, and to\nvanish for asymptotically high energies. However, at moderate energies and high\n$|t|$, the higher conformal spins dominate the amplitude. We illustrate the\neffects by studying the production of two high $E_T$ jets separated by a\nrapidity gap at HERA energies. In a simplified framework, we find excellent\nagreement with the HERA photoproduction data once we incorporate the rapidity\ngap survival probability against soft rescattering effects. We emphasize that\nmeasurements of the analogous process in electroproduction may probe different\nsummations over conformal spins." }, { "anchor": "2HDMs predictions for $B \\to X_s \u03b3$ in NLO QCD: The decay $B \\to X_s \\gamma$ is studied at the Next to Leading Order in QCD\nin a class of models containing at least two Higgs doublets and with only one\ncharged Higgs boson non-decoupled at low-energy. The two-loop matching\ncondition is calculated and it is found to agree with existing results. The\ncomplete dependence of the Wilson coefficients on the matching scale is given.\nThe size of the Next to Leading Order corrections is extensively discussed.\nResults for branching ratios, possible CP asymmetries and lower bounds on the\ncharged Higgs mass are presented when the convergence of the perturbative\nseries appears fast enough to yield reliable predictions. Regions in the\nparameter space of these models where the Next to Leading Order calculation is\nstill not a good approximation of the final result for these observables are\nsingled out.", "positive": "Charged Higgs boson phenomenology in Supersymmetric models with Higgs\n triplets: We present a detailed study of the Higgs sector within an extension of the\nMinimal Supersymmetric Standard Model that includes one Complex Higgs Triplet\n(MSSM+1CHT). The model spectrum includes three singly charged Higgs bosons as\nwell as three CP-even (or scalar) and two CP-odd (or pseudoscalar) neutral\nHiggs bosons. We present an approximated calculation of the one-loop radiative\ncorrections to the neutral CP-even Higgs masses ($m_{H_i^0}$) and the couplings\n$H_i^0 Z^0 Z^0$ ($i=1$, 2, 3), which determine the magnitude of the\nHiggs-strahlung processes $e^+ e^-\\to Z^0 H^0_i$. Limits from LEP2 are then\nconsidered, in order to obtain bounds on the neutral Higgs sector. Further, we\nalso include the experimental limits from LEP2 on $e^+e^-\\to H^+H^-$ and those\non BR($t \\to b H^+$) from Tevatron, to derive bounds on the mass of the two\nlightest charged Higgs bosons ($H_1^{\\pm}$ and $H_2^{\\pm}$). Concerning the\nlatter, we find some cases, where $m_{H_1^{\\pm}} \\simeq 90$ GeV, that are not\nexcluded by any experimental bound, even for large values of $\\tan\\beta$, so\nthat they should be looked for at the Large Hadron Collider (LHC)." }, { "anchor": "Subtracted dispersion relation formalism for the two-photon exchange\n correction to elastic electron-proton scattering: comparison with data: We apply a subtracted dispersion relation formalism with the aim to improve\npredictions for the two-photon exchange corrections to elastic electron-proton\nscattering observables at finite momentum transfers. We study the formalism on\nthe elastic contribution, and make a detailed comparison with existing data for\nunpolarized cross sections as well as polarization transfer observables.", "positive": "Symmetry breaking effect on determination of polarized and unpolarized\n parton distributions: We perform a new extraction for unpolarized and polarized parton distribution\nfunctions considering a flavor decompositions for sea quarks and applying very\nrecent deep inelastic scattering (DIS) and semi inclusive deep inelastic\nscattering (SIDIS) data in the fixed flavor number scheme (FFNS) framework. In\nthe new symmetry breaking scenario the light quark and antiquark densities are\nextracted separately and new parametrization forms are determined for them. The\nheavy flavors contribution, including charm and bottom quarks, are also taken\nto be account for unpolarized distributions." }, { "anchor": "Electric dipole transitions in pNRQCD: We present a theroretical treatment of electric dipole (E1) transitions of\nheavy quarkonia based on effective field theories. Within the framework of\npotential nonrelativistic QCD (pNRQCD) we derive the complete set of\nrelativistic corrections at relative order $v^2$ to the decay rate in a\nsystematic, model-independent way. Former results from potential model\ncalculations will be scrutinized and a phenomenological analysis with lattice\ninput in relation to experimental data will be presented.", "positive": "Searching for light new physics at the LHC via lepton-number violation: We study the collider phenomenology of a simplified model containing a\nright-handed $W$ in which the $W_R$ couples predominantly to the third\ngeneration in the quark sector. The model also includes a light Majorana\nneutrino, with $M_1\\sim {\\cal O}(100)$ GeV, giving rise to\nlepton-number-violating signatures that are visible at the LHC. Taking into\naccount all the searches from the LHC and Tevatron, we find that this $W_R$ can\nstill be as light as $M_R \\sim 300$ GeV. We show that this type of new physics,\nand others like it, can be detected at the LHC using final states with three\nsame-sign same-flavour leptons." }, { "anchor": "Odderon in QCD: A review on how the Odderon idea does appear in QCD is given. In the last\nyears it has been developed a non-perturbative QCD approach based on the\nstochastic vacuum model and a perturbative one based on resummation techniques\nin the small x QCD region. Last developments on the perturbative analysis are\nshown in some details, in particular in application to diffractive eta_c\nproduction.", "positive": "Sensitivity of polarizations and spin correlations of Z boson to\n anomalous neutral triple gauge couplings at lepton collider with polarized\n beams: We investigate the effects of anomalous neutral triple gauge couplings in\n$ZZ$ and $Z\\gamma$ production processes, followed by the leptonic decay of the\n$Z$ boson, at a lepton collider with center-of-mass energy $\\sqrt{s}=250$~GeV\nand polarized beams. We use an effective Lagrangian formalism to parameterize\nthe anomalous couplings in terms of dimension-8 operators $c_{\\widetilde{B}W}$,\n$c_{BW}$, $c_{WW}$, and $c_{BB}$, and study the sensitivity of observables such\nas cross~section, polarization, and spin correlation as functions of these\ncouplings. We perform a Bayesian statistical analysis using Markov Chain Monte\nCarlo methods to determine simultaneous limits on the anomalous couplings,\ntaking into account various luminosities $\\mathcal{L} \\in \\{0.1~\\text{ab}^{-1},\n0.3~\\text{ab}^{-1}, 1~\\text{ab}^{-1}, 3~\\text{ab}^{-1}, 10~\\text{ab}^{-1}\\}$\nand systematic uncertainties. We find that polarization and spin correlation\nobservables significantly enhance the sensitivity to anomalous couplings,\nproviding stringent constraints on these couplings." }, { "anchor": "Three-parameter Lorentz-violating texture for neutrino mixing: A three-parameter model of neutrino oscillations based on a simple Lorentz-\nand CPT-violating texture is presented. The model is consistent with\nestablished data and naturally generates low-energy and neutrino-antineutrino\nanomalies of the MiniBooNE type. A one-parameter extension incorporates the\nMINOS anomaly, while a simple texture enhancement accommodates the LSND signal.", "positive": "Influence of vector interaction and Polyakov loop dynamics on\n inhomogeneous chiral symmetry breaking phases: We investigate the role of the isoscalar vector interaction and the dynamics\nof the Polyakov loop on inhomogeneous phases in the phase diagram of the\ntwo-flavor Nambu-Jona--Lasinio (NJL) model. Thereby we concentrate on phases\nwith a one-dimensional modulation, explicitly domain-wall solitons and, for\ncomparison, the chiral spiral. While the inclusion of the Polyakov loop merely\nleads to quantitative changes compared to the original NJL model, the presence\nof a repulsive vector-channel interaction has significant qualitative effects:\nWhereas for homogeneous phases the first-order phase transition gets weakened\nand eventually turns into a second-order transition or a cross-over, the domain\nof inhomogeneous phases is less affected. In particular the location of the\nLifshitz point in terms of temperature and density is not modified.\nConsequently, the critical point disappears from the phase diagram and only a\nLifshitz point (showing a different critical behavior) remains. As a result,\nsusceptibilities remain finite." }, { "anchor": "\u03bcto e in R-symmetric Supersymmetry: We demonstrate that mu/e slepton mixing is significantly more restricted than\npreviously thought within the already remarkably flavor-safe R-symmetric\nsupersymmetric standard model. We calculate bounds from mu to e gamma, mu to 3e\nand, most importantly, mu to e conversion. The process mu to e conversion is\nsignificantly more restrictive in R-symmetric models since this process can\noccur through operators that do not require a chirality-flip. We delineate the\nallowed parameter space, demonstrating that maximal mixing is rarely possible\nwith weak scale superpartners, while O(0.1) mixing is permitted within most of\nthe space. The best approach to find or rule out mu/e mixing in R-symmetric\nsupersymmetric models is a multi-pronged attack looking at both mu to e\nconversion as well as mu to e gamma. The redundancy eliminates much of the\nparameter space where one process, but not both processes, contain amplitudes\nthat accidentally destructively interfere. We briefly discuss implications for\nsearches of slepton flavor violation at the LHC.", "positive": "Photon and dilepton production from a non-equilibrium quark-gluon plasma: We calculate leading-order medium photon and dilepton yields from a\nquark-gluon plasma using (3+1)-dimensional anisotropic hydrodynamics. In the\ncase of dileptons, at leading-order it is sufficient to take into account\nnon-equilibrium corrections to the rate through the use of anisotropic\ndistribution functions. In the case of photons, non-equilibrium corrections to\nthe rate are taken into account using a self-consistent modification of the\ndistribution functions and the corresponding anisotropic hard-loop quark\nself-energies. We present predictions for the high-energy photon and dilepton\nspectrum and the photon elliptic flow as a function of invariant mass,\ntransverse momentum, shear viscosity, and initial momentum-space anisotropy.\nOur findings indicate that both high-energy photon and dilepton production are\nsensitive to the assumed level of initial momentum-space anisotropy of the\nquark-gluon plasma. In addition, we find that the photon elliptic flow depends\non the initial momentum-space anisotropy." }, { "anchor": "Double charm hadrons revisited: The dynamics of two heavy quarks inside the same hadron is probed against the\ndouble charm baryon results of SELEX. This can be seen as a part of the\nmechanism to bind tetraquarks with two heavy quarks and two light antiquarks.\nIn the framework of potential models, it is possible to test the role of\ndifferent effects: relativistic corrections, confinement, hyperfine forces,\netc. It is conjectured that an additional interaction rescaled from the\nnucleon--nucleon system and acting between light quarks only, can help in\nbringing extra, possibly required, binding in tetraquarks.", "positive": "Higgs boson production in photon-photon collision at ILC: a comparative\n study in different little Higgs models: We study the process \\gamma\\gamma->h->bb_bar at ILC as a probe of different\nlittle Higgs models, including the simplest little Higgs model (SLH), the\nlittlest Higgs model (LH), and two types of littlest Higgs models with T-parity\n(LHT-I, LHT-II). Compared with the Standard Model (SM) prediction, the\nproduction rate is found to be sizably altered in these little Higgs models\nand, more interestingly, different models give different predictions. We find\nthat the production rate can be possibly enhanced only in the LHT-II for some\npart of the parameter space, while in all other cases the rate is suppressed.\nThe suppression can be 10% in the LH and as much as 60% in both the SLH and the\nLHT-I/LHT-II. The severe suppression in the SLH happens for a large \\tan\\beta\nand a small m_h, in which the new decay mode h->\\eta\\eta (\\eta is a light\npseudo-scalar) is dominant; while for the LHT-I/LHT-II the large suppression\noccurs when f and m_h are both small so that the new decay mode h->A_H A_H is\ndominant. Therefore, the precision measurement of such a production process at\nthe ILC will allow for a test of these models and even distinguish between\ndifferent scenarios." }, { "anchor": "Quantum gravity phenomenology at the dawn of the multi-messenger era --\n A review: The exploration of the universe has recently entered a new era thanks to the\nmulti-messenger paradigm, characterized by a continuous increase in the\nquantity and quality of experimental data that is obtained by the detection of\nthe various cosmic messengers (photons, neutrinos, cosmic rays and\ngravitational waves) from numerous origins. They give us information about\ntheir sources in the universe and the properties of the intergalactic medium.\nMoreover, multi-messenger astronomy opens up the possibility to search for\nphenomenological signatures of quantum gravity. On the one hand, the most\nenergetic events allow us to test our physical theories at energy regimes which\nare not directly accessible in accelerators; on the other hand, tiny effects in\nthe propagation of very high energy particles could be amplified by\ncosmological distances. After decades of merely theoretical investigations, the\npossibility of obtaining phenomenological indications of Planck-scale effects\nis a revolutionary step in the quest for a quantum theory of gravity, but it\nrequires cooperation between different communities of physicists (both\ntheoretical and experimental). This review is aimed at promoting this\ncooperation by giving a state-of-the art account of the interdisciplinary\nexpertise that is needed in the effective search of quantum gravity footprints\nin the production, propagation and detection of cosmic messengers.", "positive": "Diffractive Vector Meson Production In A Unified $\u03ba$-Factorization\n Approach: In the framework of the $\\kappa$-factorization approach and on the basis of\nrecently determined DGSF, we calculated the production rates of ground and\nexcited (2S and D wave) states of vector mesons and investigated their various\nkinematical and spin dependencies. We also addressed the issue of S/D wave\nmixing in quarkonia." }, { "anchor": "Spontaneous CP Violation in Large Extra Dimensions: We show that in the context of large extra dimensions enough CP violation can\nbe obtained from the spontaneous breaking in a simple non-SUSY model, which is\nusually considered not to cause the spontaneous CP violation. We estimate\n\\epsilon_{K} in our scenario to be of order 10^{-3} consistent with the\nexperimental value. We also propose a modification to the see-saw mechanism and\naxion scenario to match with our model.", "positive": "Asymmetry Parameter of the $K_{1} (1270, 1400)$ by Analyzing the $B\\to\n K_{1}\u03bd\\bar\u03bd$ Transition Form Factors within QCD: Separating the mixture of the $ K_{1}(1270)$ and $K_{1}(1400) $ states, the\n$B\\to K_{1}(1270, 1400)\\nu\\bar{\\nu}$ transition form factors are calculated in\nthe three-point QCD sum rules approach. The longitudinal, transverse and total\ndecay widths as well as the asymmetry parameter, characterizing the\npolarization of the axial $K_{1}(1270, 1400)$ and the branching ratio for these\ndecays are evaluated." }, { "anchor": "Decoupling in Non-Perturbative Background Fields: the Thermal Sphaleron: Standard decoupling of heavy fermions may fail when there are\nnon-perturbative variations in a scalar field which gives masses to the\nfermions. One situation of phenomenological relevance is the case of sphalerons\nin the presence of fermions at finite temperatures. The free energy of a simple\nmodel is determined using a non-perturbative technique to study the effect of\nfermions on the scalar field. The effects of quantum and thermal fermionic\nfluctuations on the free energy of the thermal sphaleron are calculated,\nincluding contributions from the gradients of the scalar field to all orders.", "positive": "Searching for gluon quartic gauge couplings at muon colliders using the\n auto-encoder: One of the difficulties one has to face in the future phenomenological\nstudies of the new physics~(NP), is the need to deal with increasing amounts of\ndata. It is therefore increasingly important to improve the efficiency in the\nphenomenological study of the NP. Whether it is the use of the Standard Model\neffective field theory~(SMEFT), the use of machine learning~(ML) algorithms, or\nthe use of quantum computing, all are means of improving the efficiency. In\nthis paper, we use a ML algorithm, the auto-encoder~(AE), to study the\ndimension-8 operators in the SMEFT which contribute to the gluon quartic gauge\ncouplings~(gQGCs) at muon colliders. The AE is one of the ML algorithms that\nhas the potential to be accelerated by the quantum computing. It is found that\nthe AE-based anomaly detection algorithm can be used as event selection\nstrategy to study the gQGCs at the muon colliders, and is effective compared\nwith traditional event selection strategies." }, { "anchor": "Vector unparticle enhanced black holes: exact solutions and\n thermodynamics: Tensor and scalar unparticle couplings to matter have been shown to enhance\ngravitational interactions and provide corrections to the Schwarzschild metric\nand associated black hole structure. We derive an exact solution to the\nEinstein equations for vector unparticles, and conclusively demonstrate that\nthese induce Riessner-Nordstr\\\"om (RN)-like solutions where the role of the\n\"charge\" is defined by a composite of unparticle phase space parameters. These\nblack holes admit double-horizon structure, although unlike the RN metric these\nsolutions have a minimum inner horizon value. In the extremal limit, the\nHawking temperature is shown to vanish. As with the scalar/tensor case, the\n(outer) horizon is shown via entropy considerations to behave like a fractal\nsurface of spectral dimension $d_H = 2\\du$.", "positive": "V-A Constraint on a Product of R-parity Violating Couplings: We study in the framework of R-parity violating supersymmetric theories the\neffect of R-parity violation due to the operator L_i L_j \\bar{E_k} on the (V-A)\nstructure of the muon decay. The precisely measured muon decay parameters can\nconstrain a product of R-parity violating couplings:\n|\\lambda_{232}\\lambda_{131}| < 0.022 at the 90% CL, which is complementary to\nthe previous limits obtained by the e-\\mu universality in \\tau decay." }, { "anchor": "Gauge dependence and matching procedure of a nonrelativistic QED/QCD\n boundstate formalism: A nonrelativistic boundstate formalism used in contemporary calculations is\ninvestigated. It is known that the effective Hamiltonian of the boundstate\nsystem depends on the choice of gauge. We obtain the transformation charge Q of\nthe Hamiltonian for an arbitrary infinitesimal change of gauge, by which gauge\nindependence of the mass spectrum and gauge dependences of the boundstate wave\nfunctions are dictated. We give formal arguments based on the BRST symmetry\nsupplemented by power countings of Coulomb singularities of diagrams. For\nillustration: (1)we calculate Q up to O(1/c), (2)we examine gauge dependences\nof diagrams for a decay of a qqbar boundstate up to O(1/c) and show that\ncumbersome gauge cancellations can be circumvented by directly calculating Q.\nAs an application we point out that the present calculations of top quark\nmomentum distribution in the ttbar threshold region are gauge dependent. We\nalso show possibilities for incorrect calculations of physical quantities of\nboundstates when the on-shell matching procedure is employed. We give a proof\nof a justification for the use of the equation of motion to simplify the form\nof a local NRQCD Lagrangian. The formalism developed in this work will provide\nuseful cross checks in computations involving NRQED/NRQCD boundstates.", "positive": "Decay properties of the $Z_c(3900)$ through the Fierz rearrangement: We systematically construct all the tetraquark currents/operators of $J^{PC}\n= 1^{+-}$ with the quark configurations $[cq][\\bar c \\bar q]$, $[\\bar c q][\\bar\nq c]$, and $[\\bar c c][\\bar q q]$ ($q=u/d$), and derive their relations through\nthe Fierz rearrangement of the Dirac and color indices. Using the\ntransformations of $[qc][\\bar q \\bar c] \\to [\\bar c c][\\bar q q]$ and $[\\bar c\nq][\\bar q c]$, we study decay properties of the $Z_c(3900)$ as a compact\ntetraquark state; while using the transformation of $[\\bar c q][\\bar q c] \\to\n[\\bar c c][\\bar q q]$, we study its decay properties as a hadronic molecular\nstate." }, { "anchor": "Three-Loop Radiative-Recoil Corrections to Hyperfine Splitting Generated\n by One-Loop Fermion Factors: We consider three-loop radiative-recoil corrections to hyperfine splitting in\nmuonium generated by diagrams with one-loop radiative photon insertions both in\nthe electron and muon lines. An analytic result for these nonlogarithmic\ncorrections of order $\\alpha(Z^2\\alpha)(Z\\alpha)(m/M)\\widetilde E_F$ is\nobtained. This result constitutes a next step in the implementation of the\nprogram of reduction of the theoretical uncertainty of hyperfine splitting\nbelow 10 Hz.", "positive": "Multiplicity distributions for jet parton showers in a medium: The \"jet-quenching\" interpretation of suppressed high-pT hadron production at\nRHIC implies that jet multiplicity distributions and jet-like particle\ncorrelations in heavy-ion collisions at RHIC and LHC differ strongly from those\nseen at e+e- or pp colliders. Here, we present an approach for describing the\nchanges induced by the medium, which implements jet quenching as a\nprobabilistic medium-modified parton shower, treating leading and subleading\nparton splittings on an equal footing. We show that the strong suppression of\nsingle inclusive hadron spectra measured in Au-Au collisions at RHIC implies a\ncharacteristic distortion of the single inclusive distribution of soft partons\ninside the jet. We determine, as a function of jet energy, to what extent the\nsoft jet fragments can be measured above some momentum cut." }, { "anchor": "Light-Cone Distribution Amplitudes of the Ground State Bottom Baryons in\n HQET: We provide the definition of the complete set of light-cone distribution\namplitudes (LCDAs) for the ground state heavy bottom baryons with the\nspin-parities J^P = 1/2^+ and J^P = 3/2^+ in the heavy quark limit. We present\nthe renormalization effects on the twist-2 light-cone distribution amplitudes\nand use the QCD sum rules to compute the moments of twist-2, twist-3, and\ntwist-4 LCDAs. Simple models for the heavy baryon distribution amplitudes are\nanalyzed with account of their scale dependence.", "positive": "Properties of nucleon in nuclear matter: once more: We calculate the mass and residue of the nucleon in nuclear matter in the\nframework of QCD sum rules using the nucleon's interpolating current with an\narbitrary mixing parameter. We evaluate the effects of the nuclear medium on\nthese quantities and compare the obtained results with the existing theoretical\npredictions. The results are also compared with those obtained in vacuum to\nfind the shifts in the quantities under consideration. Our calculations show\nthat these shifts in the mass and residue are about $32\\%$ and $15\\%$,\nrespectively." }, { "anchor": "Standard-smooth hybrid inflation: We consider the extended supersymmetric Pati-Salam model which, for mu>0 and\nuniversal boundary conditions, succeeds to yield experimentally acceptable\nb-quark masses by moderately violating Yukawa unification. It is known that\nthis model can lead to new shifted or new smooth hybrid inflation. We show that\na successful two-stage inflationary scenario can be realized within this model\nbased only on renormalizable superpotential interactions. The cosmological\nscales exit the horizon during the first stage of inflation, which is of the\nstandard hybrid type and takes place along the trivial flat direction with the\ninflaton driven by radiative corrections. Spectral indices compatible with the\nrecent data can be achieved in global supersymmetry or minimal supergravity by\nrestricting the number of e-foldings of our present horizon during the first\ninflationary stage. The additional e-foldings needed for solving the horizon\nand flatness problems are naturally provided by a second stage of inflation,\nwhich occurs mainly along the built-in new smooth hybrid inflationary path\nappearing right after the destabilization of the trivial flat direction at its\ncritical point. Monopoles are formed at the end of the first stage of inflation\nand are, subsequently, diluted by the second stage of inflation to become\nutterly negligible in the present universe for almost all (for all) the allowed\nvalues of the parameters in the case of global supersymmetry (minimal\nsupergravity).", "positive": "HNL see-saw: lower mixing limit and pseudodegenerate state: Heavy Neutral Leptons are popular hypothetical particles, first introduced as\na way to explain neutrino oscillations, and since then extensively studied in\nrelation to many other aspects of physics beyond the Standard Model. They also\nserve as viable targets for direct experimental searches, being effectively\ndescribed only by HNL mass and mixing with each neutrino flavor. Motivated by\nthis, we study the lower theoretical boundary for mixing with a specified\nflavor in two and three HNLs cases. We find the connection of this limit with\nthe effective neutrino mass appearing in neutrinoless double beta decay (and\nsimilar expressions for mixing with muon and tau neutrino). In two HNLs case,\nthere is a rather strict relation between mixing of different HNLs with the\nsame neutrino flavor. We find that existing exclusion regions and their\nexpected expansions in the near future are all described by a certain limit. We\ncall that limit pseudodegenerate and find its relation to the symmetrical\nlimit, already studied in the literature. We also study pseudodegenerate limit\nand conditions under which it is achieved in three HNLs case." }, { "anchor": "The Supersymmetric Flavor Problem for Heavy First-Two Generation Scalars\n at Next-to-Leading Order: We analyze in detail the constraints on SUSY-model parameters obtained from\nK-Kbar mixing in the hypothesis of a splitted SUSY spectrum. FCNC contributions\nfrom gluino-squark-quark interactions are studied in the so-called mass\ninsertion approximation. We present boundaries on mass insertions and on SUSY\nmass scales. We improve previous results by including the NLO-QCD corrections\nto Delta S=2 effective Hamiltonian and the complete set of B-parameters for the\nevaluation of hadronic matrix elements.\n A full set of magic-numbers, that can be used for further analyses of these\nmodels, is also given. We find that the inclusion of NLO-QCD corrections and\nthe B-parameters change the results obtained at LO and in the Vacuum Insertion\nApproximation by an amount of about 25-35%.", "positive": "A Gravitational Potential with Extra-dimensions and Spin Effects In\n Hadronic Reactions: The impact of the KK-modes in d-brane models of gravity with large\ncompactification radii and TeV-scale quantum gravity on the hadronic potential\nat small impact parameters is examined. The effects of the gravitational\nhadronic form factors obtained from the generalized parton distributions (GPDs)\non the behavior of the gravitational potential and the possible spin\ncorrelation effects are also analysed." }, { "anchor": "NNLO QCD corrections to the polarized top quark decay $t(\\uparrow) \\to\n X_b+W^+$: We compute the next-to-next-to-leading order (NNLO) QCD corrections to the\ndecay $t(\\uparrow) \\to X_b +W^+$ of a polarized top quark. The spin-momentum\ncorrelation in this quasi two-body decay is described by the polar angle\ndistribution $\\mathrm{d}\\Gamma/\\mathrm{d}\\cos\\theta_P=\\frac{\\Gamma}{2}(1+P_t\\,\n\\alpha_P\\, \\cos\\theta_P)$ where $P_t$ is the polarization of the top quark and\n$\\alpha_P$ denotes the asymmetry parameter of the decay. For the latter we find\n$\\alpha^{\\mathrm{NNLO}}_P=0.3792\\pm 0.0037$.", "positive": "Gravitational Wave Signals of Electroweak Phase Transition Triggered by\n Dark Matter: We study in this work a scenario that the universe undergoes a two step phase\ntransition with the first step happened to the dark matter sector and the\nsecond step being the transition between the dark matter and the electroweak\nvacuums, where the barrier between the two vacuums, that is necessary for a\nstrongly first order electroweak phase transition (EWPT) as required by the\nelectroweak baryogenesis mechanism, arises at the tree-level. We illustrate\nthis idea by working with the standard model (SM) augmented by a scalar singlet\ndark matter and an extra scalar singlet which mixes with the SM Higgs boson. We\nstudy the conditions for such pattern of phase transition to occur and\nespecially for the strongly first order EWPT to take place, as well as its\ncompatibility with the basic requirements of a successful dark matter, such as\nobserved relic density and constraints of direct detections. We further explore\nthe discovery possibility of this pattern EWPT by searching for the\ngravitational waves generated during this process in spaced based\ninterferometer, by showing a representative benchmark point of the parameter\nspace that the generated gravitational waves fall within the sensitivity of\neLISA, DECIGO and BBO." }, { "anchor": "Event Shape Engineering and Multiplicity dependent Study of Identified\n Particle Production in proton+proton Collisions at $\\sqrt{s}$= 13 TeV using\n PYTHIA8: Small system collectivity observed at the LHC energies along with enhancement\nof strangeness makes high-multiplicity proton+proton (pp) collisions very\ninteresting in order to look for QGP-like features, usually found in heavy-ion\ncollisions. It may be interesting to perform a double differential study of\ndifferent observables in pp collisions in terms of charged particle\nmultiplicity and event shape in order to understand the new dimensions in\nhigh-multiplicity pp physics. We study the correlation between the number of\nmulti-partonic interactions (nMPI), event shape (transverse spherocity) and\ncharged particle multiplicity classes. For the first time, we report the\nsimulation results on the spherocity and charged particle multiplicity\ndependent study of ($\\pi^{+}+\\pi^{-}$), (K$^{+}$+K$^{-}$),\n(p+$\\mathrm{\\bar{p}}$), K$^{*0}$, $\\phi$ and ($\\Lambda+\\bar{\\Lambda}$)\nproduction in pp collisions at $\\sqrt{s}$ = 13 TeV using PYTHIA8. We explore\nthe event shape and charged particle multiplicity dependence of the transverse\nmomentum ($p_{\\rm{T}}$) spectra, integrated yield, mean transverse momentum\n($\\langle p_{\\rm{T}} \\rangle$) and particle ratios of the identified particles.\nThis study provides a baseline for exploring the the event topology and final\nstate multiplicity dependence of identified particle production in the LHC pp\ncollisions.", "positive": "Predictions for 5.023 TeV Pb+Pb collisions at the LHC: We compute predictions for various low-transverse-momentum bulk observables\nin $\\sqrt{s_{NN}} = 5.023$ TeV Pb+Pb collisions at the LHC from the\nevent-by-event next-to-leading-order perturbative-QCD + saturation + viscous\nhydrodynamics (\"EKRT\") model. In particular, we consider the centrality\ndependence of charged hadron multiplicity, flow coefficients of the\nazimuth-angle asymmetries and correlations of event-plane angles. The\ncentrality dependencies of the studied observables are predicted to be very\nsimilar to those at 2.76 TeV, and the magnitudes of the flow coefficients and\nevent-plane angle correlations are predicted to be close to those at 2.76 TeV.\nThe flow coefficients may, however, offer slightly more discriminating power on\nthe temperature dependence of QCD matter viscosity than the 2.76 TeV\nmeasurements. Our prediction for the multiplicity in the 0-5\\% centrality\nclass, obtained using the two temperature-dependent shear-viscosity-to-entropy\nratios that give the best overall fit to RHIC and LHC data is $dN_{\\rm\nch}/d\\eta\\big|_{|\\eta|\\le 0.5} =1876\\dots2046$. We also predict a power-law\nincrease from 200 GeV Au+Au collisions at RHIC to 2.76 and 5.023 TeV Pb+Pb\ncollisions at the LHC, $dN_{\\rm ch}/d\\eta\\big|_{|\\eta|\\le 0.5} \\propto\ns^{0.164\\dots0.174}$." }, { "anchor": "The High Energy Jets Framework: High Energy Jets provides an all-order description of wide-angle QCD\nemissions, resumming the leading-logarithmic contributions in the high-energy\nlimit. In this contribution, we briefly summarise the approach and its\nimplementation in a flexible Monte Carlo event generator. We discuss\ncomparisons between HEJ and recent LHC data and then go on to probe the\nsimilarities and differences in the results obtained from High Energy Jets and\nother theoretical frameworks in inclusive dijet and W+dijet production.", "positive": "Possible Molecular States Composed of Doubly Charmed Baryons with\n Couple-channel Effect: We systematically investigate the possible molecular states composed of (1)\ntwo spin-$\\frac{3}{2}$ doubly charmed baryons, and (2) a pair of\nspin-$\\frac{3}{2}$ and spin-$\\frac{1}{2}$ doubly charmed baryons. The\none-boson-exchange (OBE) model is used to describe the potential between two\nbaryons. The channel mixing effect is considered for the systems with the same\nquantum number $(I(J^P))$ but different total spin ($S$) and orbital angular\nmomenta ($L$). We also study the channel mixing effect among the systems\ncomposed of various doubly charmed baryons if they have the same quantum\nnumber. Many of the systems are good candidates of molecular states." }, { "anchor": "Boosted Multijet Resonances and New Color-Flow Variables: We use modern jet-substructure techniques to propose LHC searches for\nmultijet-resonance signals without leptons or missing energy. We focus on\nthree-jet resonances produced by R-parity-violating decays of boosted gluinos,\nshowing that shape analyses searching for a mass peak can probe such gluinos up\nto masses of ~ 750 GeV (650 GeV) with 20/fb (5/fb) at the LHC at 8 TeV. This\ncomplements existing search strategies, which also include counting methods\nthat are inherently more prone to systematic uncertainties. Since\nR-parity-violating gluinos lighter than all squarks hadronize before decaying,\nwe introduce new color-flow variables, \"radial pull\" and \"axis contraction\",\nwhich are sensitive to the color structure of the R-hadron's decay. The former\nmeasures the inward pull of subjets in a fat jet, while the latter quantifies\nthe inward drift of the $N$-subjettiness axes when changing the distance\nmeasure. We show that they can dramatically improve the discrimination of a\nboosted gluino signal versus QCD, ttbar and combinatoric background for\nm_gluino ~ m_top. Cuts on axis contraction also noticeably improve the\nresonance shape for heavy gluinos with m_gluino > ~500 GeV. With minor\nadaptations, these variables could find application in substructure searches\nfor particles in different color representations or with other decay\ntopologies. We also compare how several different Monte Carlo generators model\nthe high-multiplicity QCD background. This provides evidence that the\ndiscriminating power of our color-flow observables are robust, and provides\nuseful guidance for future substructure studies.", "positive": "Positivity Bounds on Higgs-Portal Dark Matter: We consider the positivity bounds for WIMP scalar dark matter with effective\nHiggs-portal couplings up to dimension-8 operators. Taking the superposed\nstates for Standard Model Higgs and scalar dark matter, we show that the part\nof the parameter space for the effective couplings, otherwise unconstrained by\nphenomenological bounds, is ruled out by the positivity bounds on the\ndimension-8 derivative operators. We find that dark matter relic density,\ndirect and indirect detection and LHC constraints are complementary to the\npositivity bounds in constraining the effective Higgs-portal couplings. In the\neffective theory obtained from massive graviton or radion, there appears a\ncorrelation between dimension-8 operators and other effective Higgs-portal\ncouplings for which the strong constraint from direct detection can be evaded.\nNailing down the parameter space mainly by relic density, direct detection and\npositivity bounds, we find that there are observable cosmic ray signals coming\nfrom the dark matter annihilations into a pair of Higgs bosons, $WW$ or $ZZ$." }, { "anchor": "Pentaquarks and resonances in the $pJ/\u03c8$ spectrum: We consider exotic baryons with hidden charm as antiquark-diquark-diquark\ncomposite systems. Spin and isospin structure of such exotic states is given\nand masses are estimated. The data for production of pentaquarks in the\nreaction $\\Lambda_b\\to K^-p J/\\psi$ are discussed. We suggest that the narrow\npeak in $pJ/\\psi$ spectra at 4450 MeV is antiquark-diquark-diquark state with\nnegative parity, $5/2^{-}(4450)$, while the broad bump $3/2^{+}(4380)$ is the\nresult of rescatterings in the ($pJ/\\psi$)-channel. Positions of other\npentaquarks with negative parity are estimated.", "positive": "Quark-model study of few-baryon systems: We review the application of non-relativistic constituent quark models to\nstudy one, two and three non-strange baryon systems. We present results for the\nbaryon spectra, potentials and observables of the NN, N$\\Delta$, $\\Delta\\Delta$\nand NN$^*(1440)$ systems, and also for the binding energies of three\nnon-strange baryon systems. We make emphasis on observable effects related to\nquark antisymmetry and its interplay with quark dynamics." }, { "anchor": "Non-supersymmetric SO(10) models with Gauge and Yukawa coupling\n unification: We study a non-supersymmetric SO(10) Grand Unification Theory with a very\nhigh energy intermediate symmetry breaking scale in which not only gauge but\nalso Yukawa coupling unification are enforced via suitable threshold\ncorrections and matching conditions. For gauge unification, we focus on a few\nsymmetry breaking patterns with the intermediate gauge groups ${\\rm SU(4)_C\n\\times SU(2)_L \\times SU(2)_R}$ (Pati-Salam) and ${\\rm SU(3)_C \\times SU(2)_L\n\\times SU(2)_R\\times U(1)_{B-L}}$ (minimal left-right symmetry) assuming an\nadditional global U(1) Peccei--Quinn symmetry, and having the Standard Model\nsupplemented by a second Higgs doublet field at the electroweak scale. We\nderive the conditions as well as the approximate analytical solutions for the\nunification of the gauge coupling constants at the two-loop level and discuss\nthe constraints from proton decay on the resulting high scale. Specializing to\nthe case of the Pati-Salam intermediate breaking pattern, we then impose also\nthe unification of the Yukawa couplings of third generation fermions at the\nhigh scale, again at the two-loop level. In the considered context, Yukawa\nunification implies a relation between the fermion couplings to the 10- and\n126-dimensional scalar representations of the SO(10) group. We consider one\nsuch possible relation which is obtainable in an ${\\rm E_6}$ model where the\nprevious two scalar fields are part of a single multiplet. Taking into account\nsome phenomenological features such as the absence of flavor changing neutral\ncurrents at tree-level, we derive constraints on the parameters of the low\nenergy model, in particular on the ratio of the two Higgs doublets vacuum\nexpectation values $\\tan\\beta$.", "positive": "Impact of a four-zero Yukawa texture on $h\\to \u03b3\u03b3$ and $\u03b3\n Z$ in the framework of the Two Higgs Doublet Model Type III: We study the substantial enhancement, with respect to the corresponding\nStandard Model rates, that can be obtained for the branching ratios of the\ndecay channels $h \\to \\gamma \\gamma$ and $h\\to \\gamma Z$ within the framework\nof the Two Higgs Doublet Model Type III, assuming a four-zero Yukawa texture\nand a general Higgs potential. We show that these processes are very sensitive\nto the flavor pattern entering the Yukawa texture and to the triple coupling\nstructure of the Higgs potential, both of which impact onto the aforementioned\ndecays. We can accommodate the parameters of the model in such a way to obtain\nthe $h \\to \\gamma \\gamma$ rates reported by the Large Hadron Collider and at\nthe same time we get a $h\\to \\gamma Z$ fraction much larger than in the\nStandard Model, indeed within experimental reach. We present some scenarios\nwhere this phenomenology is realized for spectrum configurations that are\nconsistent with current constraints. We also discuss the possibility of\nobtaining a light charged Higgs boson compatible with all such measurements,\nthereby serving the purpose of providing a hallmark signal of the scenario\nconsidered." }, { "anchor": "Investigating jet-medium interaction using charge dependent\n three-particle correlation in high multiplicity p+Pb collisions at\n $\\sqrt{s_{NN} }$ = 5.02 TeV: Although many observations in high multiplicity p+Pb collisions at the LHC\nindicate striking similarity to heavy ion collisions, no evidence of jet-medium\ninteractions has been observed till date. We study the effect of jet-medium\ninteraction on the charge dependent three-particle correlation in high\nmultiplicity p+Pb collisions at $\\sqrt{s_{NN} }$ = 5.02 TeV using EPOS 3 event\ngenerator. The short range component of the three-particle correlation is\ndominated by the jet fragmentation and has a unique charge dependence as\nobserved in the minimum bias p+Au collisions at the RHIC energy. In EPOS 3,\nsimilar pattern has been observed in the lower multiplicity classes of p+Pb\ncollisions where jet fragmentation plays the dominant role. Interestingly, the\ncharge dependence of three-particle correlation gets diminished in the higher\nmultiplicity classes of p+Pb collisions where the jet-medium interactions as\nimplemented in EPOS 3 plays an important role. The current study can,\ntherefore, provide possible ways to investigate the jet-medium interaction in\nhigh multiplicity classes of small collision systems at the LHC energies.", "positive": "A note on the scale evolution of the ETQS function T_F(x,x): We reexamine the scale dependence of the ETQS (Efremov-Teryaev-Qiu-Sterman)\ntwist-3 matrix element which has been studied already by the four different\ngroups with conflicting results Ref.[1-4]. We find that we can in fact\nreproduce the results of Ref.[4] with the method Ref.[4] when we treat some\nsubtleties with greater care, thus easing the mentioned conflict." }, { "anchor": "Low Energy Data and a Model of Flavor Mixing: We consider a model in which the third family fermions are subjected to an\nSU(2) interaction different from the first two family fermions. Constrained by\nthe Z-pole data, the heavy gauge boson mass is bounded from below to be about\n1.7 TeV at the $2\\sigma$ level. In this model, the flavor mixing between $\\tau$\nand $\\mu$ can be so large that $Br(\\tau\\to \\mu \\bar{\\nu_\\mu} \\nu_\\tau)/\nBr(\\tau\\to e \\bar{\\nu_e} \\nu_\\tau)$ and $Br(\\tau\\to \\mu \\mu \\mu)$ provide a\nbetter constraint than the LEP/SLC data in some region of parameter space.\nFurthermore, flavor-changing neutral currents are unavoidable in the quark\nsector of the model. Significant effects to the $B^0-\\bar{B^0}$ mixing and the\nrare decays of the $K$ and $B$ mesons, such as $K^\\pm \\to \\pi^\\pm \\nu {\\bar\n\\nu}, b \\to s \\nu {\\bar \\nu}, B_s \\to \\tau^+\\tau^-, \\mu^+\\mu^-$ and $B_{s,d}\n\\to \\mu^\\pm \\tau^\\mp$, are expected.", "positive": "Inclusive spectra of hadrons created by color tube fission 1.\n Probability of tube fission: The probability of color tube fission that includes the tube surface small\noscillation corrections is obtained with pre-exponential factor accuracy on the\nbasis of previously constructed color tube model. Using these expressions the\nprobability of the tube fission in $n$ point is obtained that is the basis for\ncalculation of inclusive spectra of produced hadrons." }, { "anchor": "A Complete Analysis of \"Flavored\" Electric Dipole Moments in\n Supersymmetric Theories: The Standard Model predictions for the hadronic and leptonic electric dipole\nmoments (EDMs) are well far from the present experimental resolutions, thus,\nthe EDMs represent very clean probes of New Physics effects. Especially, within\nsupersymmetric frameworks with flavor-violating soft terms large and\npotentially visible effects to the EDMs are typically expected. In this work,\nwe systematically evaluate the predictions for the EDMs at the\nbeyond-leading-order (BLO). In fact, we show that BLO contributions to the EDMs\ndominate over the leading-order (LO) effects in large regions of the\nsupersymmetric parameter space. Hence, their inclusion in the evaluation of the\nEDMs is unavoidable. As an example, we show the relevance of BLO effects to the\nEDMs for a SUSY $SU(5)$ model with right-handed neutrinos.", "positive": "Amplitude analysis of the anomalous decay $\u03b7'\\to\u03c0^+\u03c0^-\u03b3$: In this paper we perform an amplitude analysis of $\\eta'\\to\\pi^+\\pi^-\\gamma$\nand confront it with the latest BESIII data. Based on the final-state\ninteraction theorem, we represent the amplitude in terms of an Omn\\'es function\nmultiplied by a form factor that corresponds to the contributions from\nleft-hand cuts and right-hand cuts in the inelastic channels. We also take into\naccount the isospin violation effect induced by $\\rho-\\omega$ mixing. Our\nresults show that the anomaly contribution is mandatory in order to explain the\ndata. Its contribution to the decay width of $\\Gamma(\\eta'\\to\\pi\\pi\\gamma)$ is\nlarger than that induced by isospin violation. Finally we extract the pole\npositions of the $\\rho$ and $\\omega$ as well as their corresponding residues." }, { "anchor": "Updated Global Analysis of Higgs Couplings: There are many indirect and direct experimental indications that the new\nparticle H discovered by the ATLAS and CMS Collaborations has spin zero and\n(mostly) positive parity, and that its couplings to other particles are\ncorrelated with their masses. Beyond any reasonable doubt, it is a Higgs boson,\nand here we examine the extent to which its couplings resemble those of the\nsingle Higgs boson of the Standard Model. Our global analysis of its couplings\nto fermions and massive bosons determines that they have the same relative sign\nas in the Standard Model. We also show directly that these couplings are highly\nconsistent with a dependence on particle masses that is linear to within a few\n%, and scaled by the conventional electroweak symmetry-breaking scale to within\n10%. We also give constraints on loop-induced couplings, on the total Higgs\ndecay width, and on possible invisible decays of the Higgs boson under various\nassumptions.", "positive": "Recent Progress in Leptogenesis: After recalling the general virtues of leptogenesis we compare two\nrealizations, Affleck-Dine leptogenesis and thermal leptogenesis, which\ngenerically lead to different predictions for neutrino masses. Finally, we\ndescribe the progress towards a full quantum mechanical description of the\nbasic non-equilibrium process of leptogenesis beyond the approximations\ninvolved in Boltzmann's equations." }, { "anchor": "Revisiting Axial-Vector Meson Mixing: Various phenomenological studies indicate that the mixing angle\n$\\theta_{K_1}$ of $K_{1A}$ and $K_{1B}$, the strange partners of the\naxial-vector mesons $a_1(1260)$ and $b_1(1235)$, respectively, lies in the\nvicinity of $35^\\circ$ or $55^\\circ$, but whether this angle is larger or\nsmaller than $45^\\circ$ still remains controversial. When the\n$f_1(1285)$-$f_1(1420)$ mixing angle $\\theta_{^3P_1}$ and the\n$h_1(1170)$-$h_1(1380)$ mixing angle $\\theta_{^1P_1}$ are determined from the\nmass relations, they depend on the masses of $K_{1A}$ and $K_{1B}$, which in\nturn depend on the mixing angle $\\theta_{K_1}$. We show that the approximate\ndecoupling of the light $q\\bar q$ state from the heavier $s \\bar s$ state,\nwhich is empirically valid for vector, tensor and $3^{--}$ mesons, when applied\nto isoscalar axial-vector mesons, will enable us to discriminate different\nsolutions of $\\theta_{^3P_1}$ and $\\theta_{^1P_1}$ and pick up\n$\\theta_{K_1}\\sim 35^\\circ$. Indeed, for $\\theta_{K_1}\\sim 55^\\circ$, the\npredicted $\\theta_{^1P_1}$ disagrees sharply with the recent lattice\ncalculation and the implied large $s\\bar s$ content of $h_1(1170)$ and $q\\bar\nq$ component of $h_1(1380)$ cannot explain the observation of their strong\ndecays. We conclude that $\\theta_{K_1}$ is smaller than $45^\\circ$.", "positive": "Constraining the parameter space of branon dark matter using white dwarf\n stars: In the present work we study the branon dark matter particles impact on\ncompact objects, and we provide the first constraints of the parameter space\nusing white dwarf stars. The branon dark matter model is characterized by two\nfree parameters, namely the branon mass particle M and the brane tension factor\n$f$. The latter determines the strength of the interaction of branon dark\nmatter particles with baryons. By considering a typical white dwarf star we\nwere able to obtain constraints on branon dark matter and compare with current\nlimits obtained by direct detection searches and dark matter abundance. In\nparticular our results show that i) for heavy branons with a mass $M > 10 GeV$\nwhite dwarfs fail to provide us with bounds better than current limits from DM\ndirect detection searches, and ii) for light branons in the mass range $2 keV <\nM < 1 GeV$, which cannot be probed neither with current dark matter experiments\nnor with the next generation of detectors, the dark matter abundance constrain\ndetermines $f$ as a function of $M$ in the range $0.1 GeV < M < 1 GeV$ for the\nbranon mass and $1 GeV < f < 5 GeV$ for the brane tension factor. Furthermore,\nour findings indicate that the limits from white dwarfs are not stronger than\nthe dark matter abundance constrain." }, { "anchor": "Leptogenesis from first principles in the resonant regime: The lepton asymmetry generated by the out-of-equilibrium decays of heavy\nMajorana neutrinos with a quasi-degenerate mass spectrum is resonantly\nenhanced. In this work, we study this scenario within a first-principle\napproach. The quantum field theoretical treatment is applicable for mass\nsplittings of the order of the width of the Majorana neutrinos, for which the\nenhancement is maximally large. The non-equilibrium evolution of the mixing\nMajorana neutrino fields is described by a formal analytical solution of the\nKadanoff-Baym equations, that is obtained by neglecting the back-reaction.\nBased on this solution, we derive approximate analytical expressions for the\ngenerated asymmetry and compare them to the Boltzmann result. We find that the\nresonant enhancement obtained from the Kadanoff-Baym approach is smaller\ncompared to the Boltzmann approach, due to additional contributions that\ndescribe coherent transitions between the Majorana neutrino species. We also\ndiscuss corrections to the masses and widths of the degenerate pair of Majorana\nneutrinos that are relevant for very small mass splitting, and compare the\napproximate analytical result for the lepton asymmetry with numerical results.", "positive": "Reduction of Feynman Integrals in the Parametric Representation II:\n Reduction of Tensor Integrals: In a recent paper by the author (Chen in JHEP 02:115, 2020), the reduction of\nFeynman integrals in the parametric representation was considered. Tensor\nintegrals were directly parametrized by using a generator method. The resulting\nparametric integrals were reduced by constructing and solving parametric\nintegration-by-parts (IBP) identities. In this paper, we furthermore show that\npolynomial equations for the operators that generate tensor integrals can be\nderived. Based on these equations, two methods to reduce tensor integrals are\ndeveloped. In the first method, by introducing some auxiliary parameters,\ntensor integrals are parametrized without shifting the spacetime dimension. The\nresulting parametric integrals can be reduced by using the standard IBP method.\nIn the second method, tensor integrals are (partially) reduced by using the\ntechnique of Gr\\\"obner basis combined with the application of symbolic rules.\nThe unreduced integrals can further be reduced by solving parametric IBP\nidentities." }, { "anchor": "New Production Mechanism for Heavy Neutrinos at the LHC: We study a new production mechanism for heavy neutrinos at the LHC, which\ndominates over the usually considered $s$-channel $W$-exchange diagram for\nheavy-neutrino masses larger than 100 - 200 GeV. The new mechanism is\ninfrared-enhanced by $t$-channel $W\\gamma$-fusion processes. This has important\nimplications for experimental tests of the seesaw mechanism of neutrino masses,\nand in particular, for the ongoing heavy neutrino searches at the LHC. We find\nthat the direct collider limits on the light-to-heavy neutrino mixing can be\nsignificantly improved, when this new production channel is properly taken into\naccount. The scope of this new mechanism can equally well be extended to other\nexotic searches at the LHC.", "positive": "Symmetry Restoration at High Temperature in Little Higgs Models?: In this work, we show that the apparent symmetry non-restoration at high\ntemperature for Little Higgs (LH), is not intrinsic feature for LH. We show\nthat when including such dominant thermal corrections, the EW symmetry gets\nrestored." }, { "anchor": "Examination of thermalization of quarkonia at energies available at the\n CERN Large Hadron Collider: We analyze the relative yields of different bottomonia and charmonia states\nproduced in Pb-Pb, p-Pb and high multiplicity p-p collisions at LHC, within a\nsemi-classical grand canonical ensemble approach. The underlying assumption is\nthe early thermalization and subsequent freezeout of these heavy hadrons\nresulting in their chemical freezeout at a temperature of approximately\n$230$~MeV, significantly higher than that of light and strange hadrons. The\nsystematic dependence of the freezeout temperature on the collision centrality\nis also investigated in details.", "positive": "High-energy resummation in $\u039b_c$ baryon production: We present a study on inclusive emissions of a double $\\Lambda_c$ or of a\n$\\Lambda_c$ plus a light-flavored jet system as probe channels in the semi-hard\nregime of QCD. Our formalism relies on the so-called hybrid\nhigh-energy/collinear factorization, where the standard collinear description\nis supplemented by the $t$-channel resummation \\`a la BFKL of energy logarithms\nup to the next-to-leading accuracy. We make use of the JETHAD modular\ninterface, suited to the analysis of different semi-hard reactions, employing\nthe novel KKSS19 parameterization for the description of parton fragmentation\ninto $\\Lambda_c$ baryons. We provide predictions for rapidity distributions and\nazimuthal correlations, that can be studied at current and forthcoming LHC\nconfigurations, hunting for possible stabilizing effects of the high-energy\nseries." }, { "anchor": "Observable contributions of new exotic quarks to quark mixing: Models with new vector-like quarks can produce observable quark mixing\neffects which are forbidden in the Standard Model. We classify all such models\nand write down the effective Lagrangian that results from integrating out the\nnew quarks. We study the relations between neutral and charged currents and\ndiscuss how to distinguish among the different possibilities.", "positive": "Higgs and Dark Matter Hints of an Oasis in the Desert: Recent LHC results suggest a standard model (SM)-like Higgs boson in the\nvicinity of 125 GeV with no clear indications yet of physics beyond the SM. At\nthe same time, the SM is incomplete, since additional dynamics are required to\naccommodate cosmological dark matter (DM). In this paper we show that\ninteractions between weak scale DM and the Higgs which are strong enough to\nyield a thermal relic abundance consistent with observation can easily\ndestabilize the electroweak vacuum or drive the theory into a non-perturbative\nregime at a low scale. As a consequence, new physics--beyond the DM\nitself--must enter at a cutoff well below the Planck scale and in some cases as\nlow as O(10 - 1000 TeV), a range relevant to indirect probes of flavor and CP\nviolation. In addition, this cutoff is correlated with the DM mass and\nscattering cross-section in a parameter space which will be probed\nexperimentally in the near term. Specifically, we consider the SM plus\nadditional spin 0 or 1/2 states with singlet, triplet, or doublet electroweak\nquantum numbers and quartic or Yukawa couplings to the Higgs boson. We derive\nexplicit expressions for the full two-loop RGEs and one-loop threshold\ncorrections for these theories." }, { "anchor": "Effects of CP Violation from Neutral Heavy Fermions on Neutrino\n Oscillations, and the LSND/MiniBooNE Anomalies: Neutrinos may mix with ultralight fermions, which gives flavor oscillations,\nand with heavier fermions, which yields short distance flavor change. I\nconsider the case where both effects are present. I show that in the limit\nwhere a single oscillation length is experimentally accessible, the effects of\nheavier fermions on neutrino oscillations can generically be accounted for by a\nsimple formula containing four parameters, including observable CP violation. I\nconsider the anomalous LSND and MiniBooNE results, and show that these can be\nfit in a model with CP violation and two additional sterile neutrinos, one in\nthe mass range between 0.1 and 20 eV, and the other with mass between 33 eV and\n40 GeV. I also show that this model can avoid conflict with constraints from\nexisting null short baseline experimental results.", "positive": "Precise photoproduction of the charged top-pions at the LHC with forward\n detector acceptances: We study the photoproduction of the charged top-pion predicted by the top\ntriangle moose ($TTM$) model (a deconstructed version of the topcolor-assisted\ntechnicolor $TC2$ model) via the processes $pp\\rightarrow p \\gamma p\n\\rightarrow \\pi^\\pm_t t +X$ at the 14 $TeV$ Large Hadron Collider ($LHC$)\nincluding next-to-leading order ($NLO$) $QCD$ corrections. Our results show\nthat the production cross sections and distributions are sensitive to the free\nparameters $\\sin\\omega$ and $M_{\\pi_t}$. Typical $QCD$ correction value is $7\\%\n\\sim 11\\%$ and does not depend much on $\\sin\\omega$ as well as the forward\ndetector acceptances." }, { "anchor": "Testing for New Physics with Low-Energy Anti-Neutrino Sources: LAMA as a\n Case Study: Some electroweak models with extended neutral currents, such as those based\non the $E_6$ group, lead to an increase of the $\\bar{\\nu}-e$ scattering cross\nsection at energies below 100 keV. We propose to search for the heavy Z' boson\ncontribution in an experiment with a high-activity artificial neutrino source\nand with a large-mass detector. We present the case for the LAMA experiment\nwith a large NaI(Tl) detector located at the Gran Sasso underground laboratory.\nThe neutrino flux is known to within a one percent accuracy, in contrast to the\nreactor case and one can reach lower neutrino energies. Both features make our\nproposed experiment more sensitive to extended gauge models, such as the $\\chi$\nmodel. For a low enough background the sensitivity to the $Z_\\chi$ boson mass\nwould reach 600 GeV for one year running of the experiment.", "positive": "Characterization of quark gluon plasma as seen through the energy loss\n of heavy quarks: The shear viscosity to entropy density ratio ({\\eta}/s) of quark gluon plasma\nproduced in ultra- relativistic heavy-ion collisions has been studied from the\nenergy loss of heavy quarks in QGP medium. We have also studied the bulk\nviscosity to entropy density ratio ({\\zeta}/s) and fluidity measure(F) of the\nmedium using the obtained {\\eta}/s values. In addition to that, we have\nestimated the heavy quark bound state potential (V) inside this medium. Our\nfinding of {\\eta}/s agrees well with the results obtained by Lattice QCD (LQCD)\nand functional renormalization group technique." }, { "anchor": "Radiative generation of realistic neutrino mixing with $A4$: Radiative generation of realistic mixing in neutrino sector is studied at\none-loop level in a scotogenic $A4\\times Z_2$ symmetric framework. A scheme of\nobtaining non-zero $\\theta_{13}$ through small mass splitting in right-handed\nneutrino sector is proposed. The model consists of three right-handed\nneutrinos, two of which were required to be degenerate in masses to yield the\ncommon structure of the left-handed neutrino mass matrix that corresponds to\n$\\theta_{13}=0$, $\\theta_{23}=\\pi/4$ and any $\\theta_{12}^0$ in particular the\nchoices specific to the Tribimaximal (TBM), Bimaximal (BM) and Golden Ratio\n(GR) mixings. Non-zero $\\theta_{13}$, deviations of $\\theta_{23}$ from\nmaximality and small corrections to the solar mixing angle $\\theta_{12}$ can be\ngenerated in one stroke by shifting from this degeneracy in the right-handed\nneutrino sector by a small amount. The lightest among the three $Z_2$ odd inert\n$SU(2)_L$ doublet scalars present in the model can be a potential dark matter\ncandidate.", "positive": "Parton Distributions in the Virtual Photon Target and Factorization\n Scheme Dependence: We investigate parton distributions in the virtual photon target, both\npolarized and unpolarized, up to the next-leading order (NLO) in QCD. Parton\ndistributions can be predicted completely up to NLO, but they are\nfactorization-scheme-dependent. We analyze parton distributions in several\nfactorization schemes and discuss their scheme dependence. Particular\nattentions are paid to the axial anomaly effect on the first moments of the\npolarized quark parton distributions, and also to the large-$x$ behaviors of\npolarized and unpolarized parton distributions." }, { "anchor": "Cosmological Consequences of Superconducting String Networks: We consider the cosmological consequences of a network of superconducting\ncosmic strings. For strong enough current the period of friction domination\nnever ends. Instead a plasma scaling solution is reached. We demonstrate that\nthis gives rise to a very different cosmology than the usual horizon scaling\nsolution. In particular the string network gives rise to adistinct imprint on\nthe microwave sky, giving non-Gaussian features on much smaller angular scales.\nIt also gives rise to a filament structure in string wakes. Because of the\npresence of the string magnetocylinder, the string magnetic field cannot create\na primordial magnetic field. Similarly, it evades nucleosynthesis constraints.\nWe also show that strings formed at the supersymmetry breaking scale can create\nthe required baryon asymmetry of the universe.", "positive": "Closing in on a perturbative fourth generation: A perturbative new family of fermions is now severely constrained, though not\nexcluded yet. We reconsider the current bounds (i.e., direct and from Higgs\nsearches, R_b, oblique parameters) on the fourth generation parameter space\nassuming the case of a small CKM mixing with the third generation. We identify\nviable scenarios featuring either a light or a heavy Higgs boson. A set of\nrepresentative benchmark points targeted for LHC searches is proposed with a\nnormal (inverted) quark mass hierarchy where t' -> b'W (b' -> tW) decays are\nsizable. In the case where the fourth generation couplings to the lighter quark\nfamilies are small, we suggest that search strategies at the LHC should include\nboth pair (strong) and single (weak) production with bb+nW (n=2,...,6) final\nstate signatures." }, { "anchor": "Nucleosynthesis at Finite Temperature and Density: We study the finite temperature and density effects on beta decay rates to\ncompute their contributions to nucleosynthesis in the early universe and\ncompact stars. We express nucleosynthesis parameters as a function of\ntemperature and density in different astronomical systems of interest. It is\nexplicitly shown that the chemical potential in the core of supermassive and\nsuperdense stars affect beta decay and their helium abundance but the\nbackground contributions is still dependent on relative temperature. We\ncalculate this contribution for temperature below the chemical potential. It\nhas been noticed that the acceptable background contribution are obtained for\ncomparatively larger values of T as temperature plays a role of regulating\nparameter in an extremely dense system.", "positive": "Extinction of the TeV Gamma-Ray Background by Sunlight: I show that pair production on sunlight introduces a sizable anisotropy in\nthe cosmic background of TeV gamma-rays. The anisotropy amplitude in the\ndirection of the Sun exceeds the cosmic dipole anisotropy from the motion of\nthe Sun relative to the cosmic rest-frame." }, { "anchor": "Possible Dark Matter Signals from White Dwarfs: In our galaxy, the white dwarfs (WDs) will inevitably capture the dark matter\n(DM) particles streaming through them, if there exist interactions between DM\nparticles and nuclei/electrons. At the same time, these DM particles can also\nbe evaporated by the nuclei/electrons in a WD if they have proper mass and the\nWD is not too cold. The evaporation of DM particles will lead to a faster\ncooling evolution than that predicted by the stellar evolution theory. In this\nwork, we ascribe the faster cooling evolution of three observed WDs to the\ncapture and evaporation of DM particles, and get the possible DM particle's\nmass and DM-electron cross section as follows: for $F(q) = 1$, $40\\\n\\mathrm{MeV}/c^{2} \\lesssim m_{\\chi} \\lesssim 70\\ \\mathrm{MeV}/c^{2}$ and\n$10^{-57} \\mathrm{cm}^{2} \\lesssim \\sigma_{\\chi,e} \\lesssim 10^{-55}\n\\mathrm{cm}^{2}$; for $F(q) = (\\alpha m_{e})^{2}/q^{2}$, $30\\\n\\mathrm{MeV}/c^{2} \\lesssim m_{\\chi} \\lesssim 60\\ \\mathrm{MeV}/c^{2}$ and\n$10^{-53} \\mathrm{cm}^{2} \\lesssim \\sigma_{\\chi,e} \\lesssim 10^{-51}\n\\mathrm{cm}^{2}$. These results are beyond the detection capabilities of\ncurrent direct detection experiments and should be cross checked by more novel\nscenarios in the future.", "positive": "Calculational Techniques in Particle Theory: In this contribution, I review some of the latest advances in calculational\ntechniques in theoretical particle physics. I focus, in particular, on their\napplication to the calculation of highly non-trivial scattering processes,\nwhich are relevant for precision phenomenology studies at the Large Hadron\nCollider at CERN." }, { "anchor": "Inclusive Production of Single Hadrons with Finite Transverse Momenta in\n Deep-Inelastic Scattering at Next-to-Leading Order: We calculate the cross section for the inclusive production of single hadrons\nwith finite transverse momenta in deep-inelastic scattering at next-to-leading\norder (NLO), i.e. through O(alpha_s^2), in the parton model of QCD endowed with\nnon-perturbative parton distribution functions (PDFs) and fragmentation\nfunctions (FFs). The NLO correction is found to produce a sizeable enhancement\nin cross section, of up to one order of magnitude, bringing the theoretical\nprediction to good agreement with recent measurements for neutral pions and\ncharged hadrons at DESY HERA. This provides a useful test for the universality\nand the scaling violations of the FFs predicted by the factorization theorem.\nSuch comparisons can also be used to constrain the gluon PDF of the proton.", "positive": "Heavy Vectors in Higgs-less models: One or more heavy spin-1 fields may replace the Higgs boson in keeping\nperturbative unitarity up to a few TeV. By means of two prototype chiral models\nfor the heavy spin-1 bosons, a \"composite\" model or a \"gauge\" model, we discuss\nif and how the sole exchange of the same fields can also account for the\nElectroWeak Precision Tests. While this proves impossible in the gauge model,\nthe composite model hints to a positive solution, which we exploit to constrain\nthe phenomenological properties of the heavy vectors." }, { "anchor": "J/Psi and Psi' total cross sections and formation times from data for\n charmonium suppression in $pA$ collisions: The recent data for E866 experiment on the x_F dependence for charmonium\nsuppression in pA collisions at 800 GeV are analyzed using a time- and\nenergy-dependent preformed charmonium absorption cross section\n\\sigma_{abs}^\\psi(\\tau,\\sqrt{s}). For \\sqrt{s}=10 GeV the initially (\\tau=0)\nproduced premeson has an absorption cross section of \\sigma_{pr}~3mb. At the\nsame energy but for \\tau -> \\infty one deduces for the total cross sections\n\\sigma_{tot}^{J/Psi N}=(2.8\\pm 0.3)mb, \\sigma_{tot}^{J/Psi N}= (10.5\\pm 3.6)mb.\nThe date are compatible with a formation time \\tau_{1/2}=0.6 fm/c.", "positive": "Next-to-leading order thermal photon production in a weakly coupled\n quark-gluon plasma: We compute the next-to-leading order O(g) correction to the thermal photon\nproduction rate in a QCD plasma. The NLO contributions can be expressed in\nterms of gauge invariant condensates on the light cone, which are amenable to\nnovel sum rules and Euclidean techniques. We expect these technologies to be\ngeneralizable to other NLO calculations. For the phenomenologically interesting\nvalue of alpha_s=0.3, the NLO correction represents a 20% increase and has a\nfunctional form similar to the LO result." }, { "anchor": "Phase transitions in perturbative walking dynamics: In this paper, we investigate the dynamics of the confinement-deconfinement\nphase transition in a toy model where the walking dynamics is realized\nperturbatively. We study the properties of the phase transition focusing on the\npossible cosmological signatures it can provide. Interestingly the model is\nwell under perturbative control only when the mass of the lightest field - the\ndilaton/scalon is much lighter than the rest of the fields and the phase\ntransition proceeds slowly leading to strong signals in the stochastic\ngravitational wave spectrum.", "positive": "Exclusive production of $\u03c1$-mesons in high-energy factorization at\n HERA and EIC: We calculate cross sections for the exclusive diffractive leptoproduction of\n$\\rho$-mesons, $\\gamma^*~p~\\to~\\rho~p$, within the framework of high-energy\nfactorization. Cross sections for longitudinally and transversally polarized\nmesons are shown. We employ a wide variety of unintegrated gluon distributions\navailable in the literature and compare to HERA data. The resulting cross\nsections strongly depend on the choice of unintegrated gluon distribution. We\nalso present predictions for the proton target in the kinematics of the\nBrookhaven EIC." }, { "anchor": "Double-Lepton Polarization Asymmetries and Branching Ratio of the $B\\rar\n \u03b3l^+ l^- $ transition in Universal Extra Dimension: We study the radiative dileptonic $B \\rar \\gamma l^+ l^- $ transition in the\npresence of a universal extra dimension in the Applequist-Cheng-Dobrescu model.\nIn particular, using the corresponding form factors calculated via light cone\nQCD sum rules, we analyze the branching ratio and double lepton polarization\nasymmetries related to this channel and compare the results with the\npredictions of the standard model. We show how the results deviate from\npredictions of the standard model at lower values of the compactification\nfactor ($1/R $) of extra dimension.", "positive": "Theoretical Review of B-physics: Weak decays and mixing of B-hadrons play a special role in our understanding\nof the physics of the Standard Model and beyond. The measured amplitudes,\nhowever, result from a complicated interplay of weak and strong interaction\neffects. Understanding strong interaction dynamics, which becomes simpler for\nheavy quarks, is thus a fundamental part of the game. In this review, several\ntheoretical aspects of B dynamics which are relevant for current and future\nexperimental measurements are discussed." }, { "anchor": "Where are $\u03c7_{cJ}(3P)$?: In the present work, we propose $Y(4140)$ as the $\\chi_{c1}(3P)$ state by\nstudying the $\\chi_{c1} \\pi^+ \\pi^-$ invariant mass spectrum of the $B\\to K\n\\chi_{c1} \\pi^+ \\pi^-$ process. In the $D\\bar{D}$ invariant mass spectrum of\nthe $B\\to K D\\bar{D}$ process, we find a new resonance with the mass and width\nto be $ (4083.0 \\pm 5.0) $ and $ (24.1 \\pm 15.4) $ MeV, respectively, which\ncould be a good candidate of the $\\chi_{c0}(3P)$ state. The theoretical\ninvestigations on the decay behaviors of the $\\chi_{cJ}(3P)$ in the present\nwork support the assignments of the $Y(4140)$ and $Y(4080)$ as the\n$\\chi_{c1}(3P)$ and $\\chi_{c0}(3P)$ states, respectively. In addition, the\n$\\chi_{c2}(3P)$ state is predicted to be a very narrow state. The results in\nthe present work could be tested by further experiments in the LHCb and\nforthcoming Belle II.", "positive": "Probing the Majorana nature of the neutrino with neutrinoless double\n beta decay: Neutrinoless double beta decay (NDBD) is the only experiment that could probe\nthe Majorana nature of the neutrino. Here we study the theoretical implications\nof NDBD for models yielding tri-bimaximal lepton mixing like A4 and S4." }, { "anchor": "Strong Isospin Breaking in Heavy-Meson Decay Constants: Employing\n Borelized QCD Sum Rules in Local-Duality Limit: Applying the QCD sum-rule machinery in the so-called local-duality shape to\nheavy-light mesons reveals that, as a consequence of the non-zero mass gap\nbetween up and down quarks, the leptonic decay constants of the neutral and\ncharged versions of the $D,$ $D^\\ast,$ $B$ and $B^\\ast$ mesons differ by\napproximately 1 MeV.", "positive": "Linear power corrections to top quark pair production in hadron\n collisions: We compute, in the framework of renormalon calculus, the ${\\cal\nO}(\\Lambda_{\\rm QCD})$ corrections to the production of $t\\bar{t}$ pairs in\nhadron collisions under the assumption that $q \\bar q \\to t \\bar t$ is the\ndominant partonic channel. This assumption is not applicable to top quark pair\nproduction at the LHC but it is valid for the Tevatron where collisions of\nprotons and anti-protons were studied. We show that the linear power correction\nto the total $t \\bar t$ production cross section vanishes provided one uses a\nshort-distance scheme for the top quark mass. We also derive relatively simple\nformulas for the power corrections to top quark kinematic distributions.\nAlthough small numerically, these power corrections exhibit interesting\ndependencies on top quark kinematics." }, { "anchor": "Nonperturbative Flavor Breaking in Topological Susceptibility at Chiral\n Crossover: We demonstrate that the QCD topological susceptibility nonperturbatively gets\na significant contribution signaled by flavor-nonuniversal quark condensates at\naround the pseudo-critical temperature of the chiral crossover. It implies a\nremarkable flavor breaking in the axial anomaly as well as the QCD theta vacuum\nin high temperature QCD, which are almost flavor universal in the vacuum. A\nnontrivial flavor breaking is triggered by nonperturbative thermal loop\ncorrections at around the chiral crossover, which is different from the trivial\nflavor violation just scaled by the quark mass ratio, observed at\nasymptotically high temperatures. This critical flavor violation cannot be\ndictated by the chiral perturbation theory with that lattice QCD usually\ncompares, or the dilute instanton gas approximation based on that its\nastrophysical implications have conventionally been made. This would give an\nimpact on the thermal history and the cosmological evolution of QCD axion\nincluding the estimate of the relic abundance as a dark matter candidate.", "positive": "The Many Uses of Excited Heavy Hadrons: I discuss a variety of issues in the physics of excited bottom and charmed\nhadrons. Recent developments in spectroscopy, strong decays, and production in\nfragmentation and weak decays are reviewed." }, { "anchor": "Signature of the Fragmentation of a Color Flux Tube: The production of quark-antiquark pairs along a color flux tube precedes the\nfragmentation of the tube. Because of local conservation laws, the production\nof a $q$-$\\bar q$ pair will lead to correlations of adjacently produced mesons\n(mostly pions). Adjacently produced mesons however can be signalled by their\nrapidity difference $\\Delta y$ falling within the window of $|\\Delta y |\n$$\\lesssim$$ 1/(dN/dy)$, on account of the space-time-rapidity ordering of\nproduced mesons in a flux tube fragmentation. Therefore, the local conservation\nlaws of momentum, charge, and flavor will lead to a suppression of angular\ncorrelation function $dN/(d\\Delta \\phi\\, d\\Delta y)$ for two mesons with\nopposite charges or strangeness on the near side at $(\\Delta \\phi, \\Delta y)$$\n\\sim$0, but an enhanced correlation on the back-to-back, away side at $\\Delta\n\\phi$$\\sim$$ \\pi$, within the window of $|\\Delta y |$$\\lesssim$$ 1/(dN/dy)$.\nThese properties can be used as signatures for the fragmentation of a color\nflux tube. The gross features of the signature of flux tube fragmentation for\ntwo oppositely charged mesons are qualitatively consistent with the STAR and\nNA61/SHINE angular correlation data for two hadrons with opposite charges in\nthe low-$p_T$ region in high-energy $pp$ collisions.", "positive": "3.5 keV X-ray Line Signal from Dark Matter Decay in Local $U(1)_{B-L}$\n Extension of Zee-Babu Model: We consider a local $U(1)_{B-L}$ extension of Zee-Babu model to explain the\nrecently observed 3.5 keV X-ray line signal. The model has three Standard model\n(SM)-singlet Dirac fermions with different $U(1)_{B-L}$ charges. A complex\nscalar field charged under $U(1)_{B-L}$ is introduced to break the $U(1)_{B-L}$\nsymmetry. After $U(1)_{B-L}$ symmetry breaking a remnant discrete symmetry\nstabilizes the lightest state of the Dirac fermions, which can be a stable dark\nmatter (DM). The second lightest state, if mass splitting with the stable DM is\nabout 3.5 keV, decays dominantly to the stable DM and 3.5 keV photon through\ntwo-loop diagrams, explaining the X-ray line signal. Two-loop suppression of\nthe decay amplitude makes its lifetime much longer than the age of the universe\nand it can be a decaying DM candidate in large parameter region. We also\nintroduce a real scalar field which is singlet under both the SM and\n$U(1)_{B-L}$ and can explain the current relic abundance of the Dirac fermionic\nDMs. If the mixing with the SM Higgs boson is small, it does not contribute to\nDM direct detection. The main contribution to the scattering of DM off atomic\nnuclei comes from the exchange of $U(1)_{B-L}$ gauge boson, $Z'$, and is\nsuppressed below current experimental bound when $Z'$ mass is heavy ($\\gtrsim\n10$ TeV). If the singlet scalar mass is about 0.1-10 MeV, the DM\nself-interaction can be large enough to solve small scale structure problems in\nsimulations with the cold DM, such as, the core-vs-cusp problem and\ntoo-big-to-fail problem." }, { "anchor": "Sizable Stop Mixing in Flavored Gauge Mediation Models with Discrete\n Non-Abelian Symmetries: We analyze a minimal flavored gauge mediation model in which the electroweak\nHiggs and messenger doublets are embedded in multiplets of a discrete\nnon-Abelian symmetry. In this scenario, the minimal Higgs-messenger sector that\nis consistent with the 125 GeV Higgs mass has two vectorlike pairs of messenger\nfields. This scenario is obtained in a specific limit of the superpotential\ninteractions of the Higgs-messenger fields and the matter fields. Due to the\nstructure of the messenger-matter Yukawa couplings in this limit, sizable stop\nmixing and flavor-diagonal soft supersymmetry breaking parameters are achieved.\nIn most of the parameter space, the masses of the colored superpartners are at\nmost in the 5-6 TeV range.", "positive": "Review of QCD, QGP, Heavy Quark Meson Production Enhancement and\n Suppression: This review of the Quantum Chromodynamics (QCD),the early universe\nCosmoloical Phase Transition from the Quark-Gluon Plasma (QGP) to our present\nuniverse (QCDPT), Relativistic Heavy Ion Collisions (RHIC) which can produce\nthe QGP, the possible detection of the QGP produced by the production of mixed\nhybrid heavy quark mesons. We also review recent studies of the production of\nmixed heavy quark hybrids via RHIC and heavy quark meson supression in p-Pb and\nPb-Pb collisions." }, { "anchor": "Modeling of Charged-Neutral Kaon Fluctuations as a Signature of DCC\n Production in A--A Collisions: Anomalous event-by-event fluctuations of the relative yields of neutral\n(K$^0_s$) and charged kaon (K$^\\pm$) have been predicted to yield a signature\nfor the formation of Disoriented Chiral Condensate (DCC) in relativistic\nheavy-ion collisions. In this work, we model the production and decay of DCCs\nin the context of heavy-ion collisions at the Large Hadron Collider, and\nestimate the sensitivity of large acceptance detectors, such as the ALICE\ndetector, towards the identification of such anomalous decays. Our study is\nbased on the robust statistical observable, $\\nu_{\\rm dyn}$, known for its\nsensitivity to dynamical fluctuations. We first present simulations without\nDCCs, based on the HIJING and AMPT models, in order to establish an approximate\nreference for the magnitude of $\\nu_{\\rm dyn}({\\rm K}^{\\pm},{\\rm K}^{0}_{s})$\nand its centrality evolution in Pb--Pb collisions at the TeV energy scale. We\nnext introduce simple phenomenological models of K$^0_s$ vs. K$^\\pm$\nevent-by-event yield fluctuations, which we use to study the feasibility and\nsensitivity of detection of the production of DCCs in heavy-ion collisions.\nAlthough the precision of models such as HIJING and AMPT limit their use as\nabsolute references and thus render anomalous fluctuations difficult to define\nprecisely, our studies demonstrate that the magnitude of $\\nu_{\\rm dyn}({\\rm\nK}^{\\pm},{\\rm K}^{0}_{s})$ is in fact very sensitive to the presence of small\nadmixture of DCCs in normal non-DCC events. Consequently, while large values of\n$\\nu_{\\rm dyn}({\\rm K}^{\\pm},{\\rm K}^{0}_{s})$ may not be sufficient to\nidentify the existence of DCCs, nonetheless they constitute a first and\nnecessary condition to signal their possible production in heavy-ion\ncollisions.", "positive": "Antenna subtraction method for jet calculations at NNLO: We describe the antenna subtraction method for treating real emission\nsingularities in the calculation of jet observables at NNLO accuracy, in\nparticular in view of the computation $e^+e^- \\to 3$ jets at NNLO." }, { "anchor": "Zeros, Dips and Signs in pp and p$\\rm\\bf\\bar p$ Elastic Amplitudes: The dips observed in the differential cross sections of elastic pp and\np$\\bar{\\rm p}$ scattering are studied in terms of the locations of the zeros of\nthe real and imaginary parts of the amplitude and of the sign of real part at\nlarge $|t|$. It is confirmed that the differences in shapes of the dips in the\npp and p$\\bar{\\rm p}$ systems are determined by a change of sign of the real\ntail, which seems to be determined by perturbative QCD contributions.", "positive": "A minimal seesaw model with mu-tau symmetry: We analyse a flavour model for a lepton sector which is based on type I\nseesaw mechanism, a Z_2 symmetry for lepton flavours, a mu-tau interchange\nsymmetry and a CP symmetry. This model fits well the data of neutrino mass\nsquared differences and oscillation angles. The model predicts an overall\nneutrino mass scale for normal and inverted neutrino mass hierarchy and the\neffective mass m_beta, which is used in the neutrinoless double beta decay." }, { "anchor": "General Form of $s$, $t$, $u$ Symmetric Polynomial and Heavy Quarkonium\n physics: Induced by three gluons symmetry, Mandelstam variables $s$, $t$, $u$\nsymmetric expressions are widely involved in collider physics, especially in\nheavy quarkonium physics. In this work we study general form of $s$, $t$, $u$\nsymmetric polynomials, and find that they can be expressed as polynomials where\nthe symmetry is manifest. The general form is then used to simplify expressions\nwhich asymptotically reduces the length of original expression to one-sixth.\nBased on the general form, we reproduce the exact differential cross section of\n$J/\\psi$ hadron production at leading order in $v^2$ up to four unknown\nconstant numbers by simple analysis. Furthermore, we prove that differential\ncross section at higher order in $v^2$ is proportional to that at leading\norder. This proof explains the proportion relation at next-to-leading order in\n$v^2$ found in previous work and generalizes it to all order.", "positive": "The Restraint of Breit-wigner Formula on Fermion Wave-function\n Renormalization: This manuscript has been withdrawn due to less meaning." }, { "anchor": "Heavy quark induced effective action for gauge fields in the SU(N_c) x\n U(1) model and the low-energy structure of heavy quark current correlators: We calculate the low-energy limit of heavy quark current correlators within\nan expansion in the inverse heavy quark mass. The induced low-energy currents\nbuilt from the gluon fields corresponding to the initial heavy quark currents\nare obtained from an effective action for gauge fields in the one-loop\napproximation at the leading order of the 1/m expansion. Explicit formulae for\nthe low-energy spectra of electromagnetic and tensor heavy quark current\ncorrelators are given. Consequences of the appearance of a nonvanishing\nspectral density below the two-particle threshold for high precision\nphenomenology of heavy quarks are discussed quantitatively.", "positive": "Global constraints on neutral-current generalized neutrino interactions: We study generalized neutrino interactions (GNI) for several neutrino\nprocesses, including neutrinos from electron-positron collisions,\nneutrino-electron scattering, and neutrino deep inelastic scattering. We\nconstrain scalar, pseudoscalar, and tensor new physics effective couplings,\nbased on the standard model effective field theory at low energies. We have\nperformed a global analysis for the different effective couplings. We also\npresent the different individual constraints for each effective parameter\n(scalar, pseudoscalar, and tensor). Being a global analysis, we show robust\nresults for the restrictions on the different GNI parameters and improve some\nof these bounds." }, { "anchor": "Spontaneous magnetization of quark matter in the inhomogeneous chiral\n phase: Considering the density wave of scalar and pseudoscalar condensates, we study\nthe response of quark matter to a weak external magnetic field. In an external\nmagnetic field, the energy spectrum of the lowest Landau level becomes\nasymmetric about zero, which is closely related to chiral anomaly, and gives\nrise to the spontaneous magnetization. This mechanism may be one of candidates\nfor the origin of the strong magnetic field in pulsars and/or magnetars.", "positive": "Multipion coherent effects in high energy heavy-ion collisions: Multipion production in high energy nucleus-nucleus collisions is considered\nin the model of the pion radiation by classical current. Strong coherent\neffects of narrowing of pion longitudinal and transverse momenta distributions\nare predicted at the RHIC energy. The coherence enhances the large\npseudorapidities producing the bump in the distribution. The growth of the\naverage pion multiplicity and the oscillation effect in the multiplicity\ndistribution are caused by the coherence as well." }, { "anchor": "Again on hidden sector of the Universe, accessible through photonic\n portal: We describe more precisely the mechanism of spontaneous mass generation in\nthe previously proposed model of hidden sector of the Universe. The hidden\nsector is conjectured to consist of sterile spin-1/2 fermions (sterinos) whose\nmass is spontaneously generated by sterile scalar bosons (sterons), while their\ninteractions are mediated by sterile antisymmetric-tensor bosons (A bosons).\nSuch a sector communicates with the familiar Standard Model sector through a\nphotonic portal acting weakly between both sectors (but stronger than the\nuniversal gravity). This is due to photons which, beside sterinos and sterons,\ncontribute to the source of the A bosons. Sterinos can be candidates for\nthermal cold dark matter. They can be also produced in sterino-antisterino\npairs through virtual photons emitted in high-energy collisions of Standard\nModel charged particles. Sterinos display a tiny magnetic moment spontaneously\ngenerated by sterons.", "positive": "Probing proton intrinsic charm in photon or Z boson production\n accompanied by heavy jets at LHC: We consider an observable very sensitive to the non-zero intrinsic charm (IC)\ncontribution to the proton density. It is the ratio between the differential\ncross sections of the photon or $Z$-boson and $c$-jet production in the $pp$\ncollision, $\\gamma(Z) + c$, and the $\\gamma(Z)$ and the $b$-jet production. It\nis shown that this ratio can be approximately flat or increasing at large\n$\\gamma(Z)$ transverse momenta $p_T$ and their pseudo-rapidities $1.5 < \\eta <\n2.4$ if the IC contribution is taken into account. On the contrary, in the\nabsence of the IC this ratio decreases as $p_T$ grows. We also present the\nratios of the cross sections integrated over $p_T$ as a function of the IC\nprobability $w$. It is shown that these ratios are mostly independent on the\ntheoretical uncertainties, and such predictions could therefore be much more\npromising for the search for the intrinsic charm signal at the LHC compared to\nthe predictions for $p_T$-spectra, which significantly depend on these\nuncertainties." }, { "anchor": "NLO Standard model effective field theory for Higgs and EW precision\n data: A set of constructs, definitions, and propositions that present a systematic\nview of the Standard Model Effective Field Theory (SMEFT), i.e. how the\ninfluence of higher energy processes is localizable in a few structural\nproperties which can be captured by a handful of Wilson coefficients.", "positive": "Magnetic susceptibility of QCD vacuum at finite density from the\n nonlocal chiral quark model: We present in this talk a recent investigation on the magnetic susceptibility\n(chi) of the QCD vacuum at finite density, utilizing the nonlocal chiral quark\nmodel from the instanton vacuum. We take into account the nonzero current-quark\nmass (m_q) explicitly to consider the effect of explicit flavor SU(3) symmetry\nbreaking. It turns out that, when we turn on the current-quark mass, chi\nbecomes smaller, indicating less response to the externally induced\nelectromagnetic field, in comparison to that for m_q=0." }, { "anchor": "On the QCD dipole content of hard photon and gluon probes: A gluon forward jet playing the role of a deep probe in high energy\nscattering, we analyze its infinite momentum QCD wave function in terms of\ndipole (color-singlet quark-antiquark) configurations using k_T-factorization\nproperties. The comparison is made with virtual photon quark-antiquark\nconfigurations. Some implications for hard processes with forward jets at Hera\nand Tevatron are suggested.", "positive": "Impact of the Dresden-II and COHERENT neutrino scattering data on\n neutrino electromagnetic properties and electroweak physics: Coherent elastic neutrino-nucleus scattering (CE$\\nu$NS) represents a\npowerful tool to investigate key electroweak physics parameters and neutrino\nproperties since its first observation in 2017 by the COHERENT experiment\nexploiting the spallation neutron source at Oak Ridge National Laboratory. In\nlight of the recent detection of such a process with antineutrinos produced by\nthe Dresden-II reactor scattering off a germanium detector, we revisit the\nlimits so far set on the neutrino magnetic moments, charge radii and\nmillicharges as well as on the weak mixing angle. In order to do so, we also\ninclude the contribution of elastic neutrino-electron scattering, whose effect\nbecomes non negligible in some beyond the Standard Model theories. By using\ndifferent hypotheses for the germanium quenching factor and the reactor\nantineutrino flux, we provide a measurement of the weak mixing angle at the\nlow-energy scale of the Dresden-II reactor experiment and, thanks to a combined\nanalysis with the latest cesium iodide and argon data set released by the\nCOHERENT Collaboration, we deliver updated limits for the neutrino\nelectromagnetic properties. Interestingly, we are able to set a new best upper\nlimit on the electron neutrino charge radius and significantly improve the\nother CE$\\nu$NS-related limits on the neutrino electric charge and magnetic\nmoment." }, { "anchor": "Higgs Sector in Anomaly-Mediated Supersymmetry Breaking Scenario: In the minimal anomaly-mediated supersymmetry breaking (AMSB) model, a\nuniversal contribution $m_{0}$ to all the scalar masses is introduced in order\nto avoid the negative slepton mass problem. The Higgs spectrum and couplings\nare determined by four parameters: $m_{\\rm aux}, m_{0}, \\tan\\beta$ and sign\n($\\mu$). The sign of $\\mu$ affects $m_A$ at large $\\tan\\beta$ and $m_h$ at\nsmall $\\tan\\beta$. The CP-odd Higgs mass $m_A$ is usually much larger than\n${m}_{Z}$ and the lightest CP-even Higgs is simply analogous to the one in the\nstandard model. The current and future Higgs searches in LEP, Tevatron and LHC\nprovide a test ground for the AMSB scenario. The current LEP bounds and LEP\n192/196 preliminary results have already excluded a small $m_{0}$ and $m_{\\rm\naux}$ region for small $\\tan\\beta$. While the entire parameter space will be\nexcluded if no Higgs is found at Tevatron RUN II with 2 ${\\rm fb}^{-1}$\nluminosity. However, if the AMSB scenario is true, a Higgs can be found at\n5$\\sigma$ significance level at both Tevatron running at luminosity 10 ${\\rm\nfb}^{-1}$ or higher and LHC.", "positive": "T-Quarks at the Large Hadron Collider: 2010-12: We study the potential of the current Large Hadron Collider (LHC) 7 TeV run\nto search for heavy, colored vector-like fermions, which are assumed to carry a\nconserved Z2 quantum number forcing them to be pair-produced. Each fermion is\nassumed to decay directly into a Standard Model quark and an invisible stable\nparticle. T-odd quarks (T-quarks) and the lightest T-odd particle (LTP) of the\nLittlest Higgs model with T-parity provide an example of this setup. We\nestimate the bounds based on the published CMS search for events with jets and\nmissing transverse energy in the 35 pb-1 data set collected in the 2010 run. We\nfind that T-quark masses below about 450 GeV are ruled out for the LTP mass\nabout 100 GeV. This bound is somewhat stronger than the published Tevatron\nconstraint. We also estimate the reach with higher integrated luminosities\nexpected in the 2011-12 run. If no deviation from the SM is observed, we expect\nthat a bound on the T-quark mass of about 650 GeV, for the LTP mass of 300 GeV\nand below, can be achieved with 1 fb-1 of data. We comment on the possibility\nof using initial-state radiation jets to constrain the region with\nnearly-degenerate T-quark and LTP." }, { "anchor": "Indirect measurement of triple-Higgs coupling at an electron-positron\n collider with polarized beams: We examine the possibility of using single-Higgs production at an $e^+e^-$\ncollider with polarized beams to measure, or constrain, indirectly a possible\nanomalous triple-Higgs coupling, which can contribute to the process via\none-loop diagrams. In the dominant process $e^+e^- \\to ZH$, longitudinally\npolarized beams can lead to an improvement in the cross section by 50\\% for\n$e^-$ and $e^+$ polarizations of $-0.8$ and $+0.3$, respectively. This\ncorresponds to an improvement in the sensitivity to the triple-Higgs coupling\nof about 18\\% for a centre-of-mass energy of 250 GeV and an integrated\nluminosity of 2 ab$^{-1}$, making a strong case of beam polarization. This also\nimplies that with polarized beams, the luminosity needed to get a particular\nsensitivity is less by about 33\\% as compared to that needed with unpolarized\nbeams. Even when only the $e^-$ beam is polarized $-0.8$, the improvement in\nthe sensitivity is about 8\\%. We also study the effect of longitudinal beam\npolarization on the sensitivity to the triple-Higgs coupling of Higgs\nproduction through the subdominant process $e^+e^- \\to H \\nu \\bar \\nu$\noccurring through $WW$ fusion.", "positive": "Sieving parton distribution function moments via the moment problem: We apply a classical mathematical problem, the moment problem, with its\nrelated mathematical achievements, to the study of the parton distribution\nfunction (PDF) in hadron physics, and propose a strategy to sieve the moments\nof the PDF by exploiting its properties such as continuity, unimodality, and\nsymmetry. Through an error-inclusive sifting process, we refine three sets of\nPDF moments from Lattice QCD. This refinement significantly reduces the errors,\nparticularly for higher order moments, and locates the peak of PDF\nsimultaneously. As our strategy is universally applicable to PDF moments from\nany method, we strongly advocate its integration into all PDF moment\ncalculations." }, { "anchor": "ILC Higgs White Paper: The ILC Higgs White Paper is a review of Higgs Boson theory and experiment at\nthe International Linear Collider (ILC). Theory topics include the Standard\nModel Higgs, the two-Higgs doublet model, alternative approaches to electroweak\nsymmetry breaking, and precision goals for Higgs boson experiments.\nExperimental topics include the measurement of the Higgs cross section times\nbranching ratio for various Higgs decay modes at ILC center of mass energies of\n250, 500, and 1000 GeV, and the extraction of Higgs couplings and the total\nHiggs width from these measurements. Luminosity scenarios based on the ILC TDR\nmachine design are used throughout. The gamma-gamma collider option at the ILC\nis also discussed.", "positive": "Supersymmetric corrections to Higgs decays and b-> s gamma for large tan\n beta: If tan beta is large, supersymmetric QCD corrections can become large,\nputting naive perturbation theory into doubt. I show how these\ntan-beta-enhanced corrections can be controlled to all orders in alpha_s\ntanbeta. The result is shown for the decays H^+ -> t b-bar and b -> s gamma." }, { "anchor": "KL to pi0 e+ e- and KL to pi0 mu+ mu- : A binary star on the stage of\n flavor physics: A systematic analysis of New Physics impacts on the rare decays KL to pi0 l+\nl- is performed. Thanks to their different sensitivities to flavor-changing\nlocal effective interactions, these two modes could provide valuable\ninformation on the nature of the possible New Physics at play. In particular, a\ncombined measurement of both modes could disentangle scalar/pseudoscalar from\nvector or axial-vector contributions. For the latter, model-independent bounds\nare derived. Finally, the KL to pi0 mu+ mu- forward-backward CP-asymmetry is\nconsidered, and shown to give interesting complementary information.", "positive": "$\u03c4- \u03bc- e$ Universality in $\u03c4$ Decays and Constraints on the\n Slepton Masses: The leptonic $\\tau$ decays are calculated at the 1-loop level in the Minimal\nSupersymmetric Standard Model. The deviation from the $\\tau - \\mu - e$\nuniversality is studied as a function of the supersymmetric parameters and\ndiscussed in the context of the expected improvement of the experimental\naccuracy." }, { "anchor": "Invariance group important for the interpretation of Bose-Einstein\n correlations: A group of transformations changing the phases of the elements of the\nsingle-particle density matrix, but leaving unchanged the predictions for\nidentical particles concerning the momentum distributions, momentum\ncorrelations etc., is identified. Its implications for the determinations of\nthe interaction regions from studies of Bose-Einstein correlations are\ndiscussed.", "positive": "The Shape of Polarized Gluon Distributions: The recent high precision SMC data on polarized $\\mu p$ scatterings have\nagain confirmed that very little of the proton spin is carried by quarks. To\nunravel the mystery of the proton spin structure, it is quite important to know\nthe behavior of the polarized gluon distribution. By using the positivity\ncondition of distribution functions together with the unpolarized and polarized\nexperimental data, we restrict the $x$ dependence of the polarized gluon\ndistribution." }, { "anchor": "Phenomenology of the Little Higgs model with X-Parity: In the popular littlest Higgs model, T-parity can be broken by\nWess-Zumino-Witten (WZW) terms induced by a strongly coupled UV completion. On\nthe other hand, certain models with multiple scalar multiplets (called moose\nmodels) permit the implementation of an exchange symmetry (X-parity) such that\nit is not broken by the WZW terms. Here we present a concrete and realistic\nconstruction of such a model. The little Higgs model with X-Parity is a\nconcrete and realistic implementation of this idea. In this contribution, the\nproperties of the model are reviewed and the collider phenomenology is\ndiscussed in some detail. We also present new results on the decay properties\nand LHC signatures of the light triplet scalars that are predicted by this\nmodel.", "positive": "Universal factorized formula for the cross-section of two-particle\n scattering: We analyze the process of two-particle scattering with unstable particle in\nan intermediate state. It was shown that the cross-section can be represented\nin the universal factorized form for an arbitrary set of particles.\nPhenomenological analysis of factorization effect is fulfilled." }, { "anchor": "Can extra dimensions accessible to the SM explain the recent measurement\n of anomalous magnetic moment of the muon?: We investigate whether models with flat extra dimensions in which SM fields\npropagate can give a significant contribution to the anomalous magnetic moment\nof the muon (MMM). In models with only SM gauge and Higgs fields in the bulk,\nthe contribution to the MMM from Kaluza-Klein (KK) excitations of gauge bosons\nis very small. This is due to the constraint on the size of the extra\ndimensions from tree-level effects of KK excitations of gauge bosons on\nprecision electroweak observables such as Fermi constant. If the quarks and\nleptons are also allowed to propagate in the (same) bulk (``universal'' extra\ndimensions), then there are no contributions to precision electroweak\nobservables at tree-level. However, in this case, the constraint from one-loop\ncontribution of KK excitations of (mainly) the top quark to T parameter again\nimplies that the contribution to the MMM is small. We show that in models with\nleptons, electroweak gauge and Higgs fields propagating in the (same) bulk, but\nwith quarks and gluon propagating in a sub-space of this bulk, both the above\nconstraints can be relaxed. However, with only one Higgs doublet, the\nconstraint from the process b -> s gamma requires the contribution to the MMM\nto be smaller than the SM electroweak correction. This constraint can be\nrelaxed in models with more than one Higgs doublet.", "positive": "Energy dependent nuclear suppression from gluon saturation in exclusive\n vector meson production: We calculate the exclusive $\\mathrm{J}/\\psi$ photoproduction cross section at\nhigh energies from the Color Glass Condensate approach. The results are\ncompared to the center-of-mass energy dependent $\\gamma+A\\to\\mathrm{J}/\\psi+A$\ncross sections extracted from measurements in ultra peripheral heavy ion\ncollisions at RHIC and LHC. We predict strong saturation-driven nuclear\nsuppression at high energies, while LHC data prefers even stronger suppression.\nWe explore the effect of nucleon shape fluctuations on the nuclear suppression\nin the coherent and incoherent cross sections, and show that the most recent\nmeasurement of the $|t|$-differential incoherent $\\mathrm{J}/\\psi$ cross\nsection prefers large event-by-event fluctuations of the nucleon substructure\nin heavy nuclei, comparable to that found for a free proton." }, { "anchor": "A Definitive Signal of Multiple Supersymmetry Breaking: If the lightest observable-sector supersymmetric particle (LOSP) is charged\nand long-lived, then it may be possible to indirectly measure the Planck mass\nat the LHC and provide a spectacular confirmation of supergravity as a symmetry\nof nature. Unfortunately, this proposal is only feasible if the gravitino is\nheavy enough to be measured at colliders, and this condition is in direct\nconflict with constraints from big bang nucleosynthesis (BBN). In this work, we\nshow that the BBN bound can be naturally evaded in the presence of multiple\nsectors which independently break supersymmetry, since there is a new decay\nchannel of the LOSP to a goldstino. Certain regions of parameter space allow\nfor a direct measurement of LOSP decays into both the goldstino and the\ngravitino at the LHC. If the goldstino/gravitino mass ratio is measured to be\n2, as suggested by theory, then this would provide dramatic verification of the\nexistence of multiple supersymmetry breaking and sequestering. A variety of\nconsistent cosmological scenarios are obtained within this framework. In\nparticular, if an R symmetry is imposed, then the gauge-gaugino-goldstino\ninteraction vertices can be forbidden. In this case, there is no bound on the\nreheating temperature from goldstino overproduction, and thermal leptogenesis\ncan be accommodated consistently with gravitino dark matter.", "positive": "Collider signature of $U_1$ Leptoquark and constraints from $b\\to c$\n observables: One of the most popular models that is known to be able to solve the lepton\nflavour universality violating charged ($b\\to c$) and neutral current ($b\\to\ns$) anomalies is the Leptoquark Model. In this work we examine the {\\it\nmultijet} + $\\mET$ collider signature of a vector leptoquark ($U_1$) which has\nthe potential to mediate both the charged and neutral current processes at tree\nlevel. From our collider analysis we derive the exclusion limits on mass for\nthe $U_1$ leptoquark at 95\\% C.L. at the current and future experiment of the\nLarge Hadron Collider. We also calculate the effect of such a leptoquark in\n$b\\to c$ observables." }, { "anchor": "Soft pattern of Rutherford scattering from heavy target mass expansion: We investigate the soft behavior of the tree-level Rutherford scattering\nprocess. We consider two types of Rutherford scattering, a low-energy massless\npoint-like projectile (say, a spin-${1\\over 2}$ or spin-$0$ electron) to hit a\nstatic massive composite target particle carrying various spins (up to\nspin-$2$), and a slowly-moving light projectile hits a heavy static composite\ntarget. For the first type, the unpolarized cross sections in the laboratory\nframe are found to exhibit universal forms in the first two orders of $1/M$\nexpansion, yet differ at the next-to-next-to-leading order (though some terms\nat this order still remain to be universal or depend on the target spin in a\ndefinite manner). For the second type, at the lowest order in electron velocity\nexpansion, through all orders in $1/M$, the unpolarized cross section is\nuniversal (also not sensitive to the projectile spin). The universality\npartially breaks down at relative order-$v^2/M^2$, though some terms at this\norder are still universal or depend on the target spin in a specific manner. We\nalso employ the effective field theory approach to reproduce the soft behavior\nof the differential cross sections for the target particle being a composite\nDirac fermion.", "positive": "Quasi Yukawa Fixed Point due to Decoupling of SUSY Particles: We study effects of SUSY particle decouplings on a quasi fixed point (QFP) of\nYukawa coupling. From renormalization group analysis it is shown that if the\nSUSY breaking scale $M_S$ is large ($\\simg 1$TeV), effects of decoupling of\nHiggsinos and squarks raise the top Yukawa QFP. This tendency is enhanced in\nmost cases of non-universal SUSY breaking. For the case of $M_S\\siml 1$TeV, the\ndecoupling of gluinos lowers $m_t^{\\rm QFP}$. We checked some parameter\ndependencies for the top Yukawa QFP. The bottom-top Yukawa unified case is also\nstudied. When top quark mass is measured more precisely, some patterns of soft\nmass spectra could be excluded if rather large initial top Yukawa coupling is\nrealized by underlying theory." }, { "anchor": "Higgs Inflation With Four-form Couplings: We consider a new inflationary model in which an antisymmetric tensor field\n$A_{\\nu\\rho\\sigma}$ and its four-form field strength\n$F_{\\mu\\nu\\rho\\sigma}=4\\partial_{[\\mu} A_{\\nu\\rho\\sigma]}$ are coupled to the\nscalar sector of the standard model and to the Ricci scalar $\\mathcal{R}$. The\nfour-form field induces modifications to the Higgs self-coupling constant, the\ncosmological constant, and the non-minimal coupling constant, which results in\nthe modification to the inflaton potential. We also show that there is no need\nfor the Higgs-gravity coupling in the presence of four-form-gravity\ninteraction, but still can produce the right amount of density perturbation for\ninflation.", "positive": "A Scaling Law for Quark Masses: We show that the observed quark masses seem to be consistent with a simple\nscaling law. Due to the precise values of the heavy quarks we are able to\ncalculate the quark masses in the light quark sector. We discuss a possible\nvalue for the strange quark mass. We show that the u-type quark masses obey the\nscaling law very well." }, { "anchor": "Second Class Current in QCD Sum Rules: Induced tensor charge of the nucleon $g_T$, which originates from G-parity\nviolation, is evaluated from QCD sum rules. We find that $g_T/g_A$ with $g_A$\nbeing the axial charge is $ -$0.0152 $\\pm$ 0.0053 which is proportional to u-d\nquark mass difference. This result is small compared to preliminary analysis of\nthe experiment, but is consistent with the estimate in the MIT bag model.", "positive": "Mass Anomalous Dimension at Large N: In this work we attempt to determine the mass anomalous dimension of the\nSU(N) gauge theory with two Dirac fermions in the adjoint representation, in\nthe limit of large N. The method uses the mode number of the Dirac operator, as\ndone in arXiv:1204.4432 for the SU(2) theory in a large volume. Taking\nadvantage of large-N volume reduction we do this on a 2^4 lattice, but we\nshould still get infinite-volume physics in the large-N limit. We find\npromising initial results, both volume reduction and the mode number method\nseem to work, but the effective volume of our lattices is probably still too\nsmall to reliably determine the mass anomalous dimension at the IRFP, and so\nresults at larger N are required." }, { "anchor": "Lepton $g-2$ and $W$-boson mass anomalies in the DFSZ axion model: With regard to the leptonic magnetic dipole moment anomaly as well as the\n$W$-boson mass excess, we study the DFSZ axion model. Considering theoretical\nand experimental constraints, we show that the muon and electron $g-2$\nanomalies can be explained within the parameter space of the model for extra\nHiggs bosons with mass spectra around the electroweak scale and for an almost\nequivalent contribution of one- and two-loop diagrams. A negative electron\n$g-2$ could be achieved by introducing heavy neutrinos. Furthermore, the $W$\nboson mass excess can be consistently addressed within the mass range of the\nmatter content testable at collider experiments.", "positive": "Electroweak Interaction Model with an Undegenerate Double Symmetry: The initial $P$-invariance of the electroweak interaction Lagrangian together\nwith the low-energy results of the Weinberg-Salam model is provided by a local\nsecondary symmetry. Among the transformation parameters of this symmetry there\nare both scalars, and pseudo-scalars with respect to the orthochronous Lorentz\ngroup. Such symmetry does admissible existence of a light (massless) axial\ngauge boson and its possible nonuniversal interaction with the leptons of\nvarious types." }, { "anchor": "Studying W+W- production at the Fermilab Tevatron with SHERPA: The merging procedure of tree-level matrix elements with the subsequent\nparton shower as implemented in SHERPA will be studied for the example of W\nboson pair production at the Fermilab Tevatron. Comparisons with fixed order\ncalculations at leading and next-to-leading order in the strong coupling\nconstant and with other Monte Carlo simulations validate once more the impact\nand the quality of the merging algorithm and its implementation.", "positive": "Baryon and lepton number transport in electroweak phase transition: We consider the baryon number generation by charge transport mechanism in the\nelectroweak phase transition taking properly into account thermal fluxes\nthrough the wall separating true and false vacuum in the spatial space. We show\nthat the diffusion from the true vacuum to the false one has a large\ndiminishing effect on the baryon number unless the wall velocity is near to,\nbut less than, the speed of sound in the medium and the ratio between the\ncollision rate and wall thickness is about 0.3. The maximum net baryon density\ngenerated is $\\rho_B/s\\simeq 0.2\\times 10^{-10}$, where $s$ is the entropy\ndensity of the Universe. If the wall proceeds as a detonation, no baryon number\nis produced." }, { "anchor": "Hybrid Textures of Majorana Neutrino Mass Matrix and Current\n Experimental Tests: Motivated by recent measurements of a relatively large \\theta_{13} in the\nDaya Bay and RENO reactor neutrino experiments, we carry out a systematic\nanalysis of the hybrid textures of Majorana neutrino mass matrix $M_\\nu$, which\ncontain one texture zero and two equal nonzero matrix elements. We show that\nthree neutrino masses (m_1, m_2, m_3) and three leptonic CP-violating phases\n(\\delta, \\rho, \\sigma) can fully be determined from two neutrino mass-squared\ndifferences (\\delta m^2, \\Delta m^2) and three flavor mixing angles\n(\\theta_{12}, \\theta_{23}, \\theta_{13}). Out of sixty logically possible\npatterns of $M_\\nu$, thirty-nine are found to be compatible with current\nexperimental data at the 3\\sigma level. We demonstrate that the texture zero of\n$M_\\nu$ is stable against one-loop quantum corrections, while the equality\nbetween two independent elements not. Phenomenological implications of $M_\\nu$\nfor the neutrinoless double-beta decay and leptonic CP violation are discussed,\nand a realization of the texture zero and equality by means of discrete flavor\nsymmetries is illustrated.", "positive": "Interactions of MeV and GeV sterile neutrinos with matter: Both cosmology and astrophysics suggest the possible existence of sterile\nneutrino which is a dark matter candidate. The interaction of sterile neutrinos\nwith matter in keV energy scale has been studied in the literature. In this\npaper we study the interaction of sterile neutrinos with atoms and their role\non ionization of atoms in MeV and GeV energy scale. We also study the\ninteraction of sterile neutrinos with nuclei in the MeV and GeV energy scale.\nWe obtain the relevant cross sections for both these two interactions. Finally\nwe compare our results with the results of keV energy range." }, { "anchor": "Status of the Standard Model Prediction of the Muon g-2: The current status of the Standard Model prediction for the anomalous\nmagnetic moment of the muon is briefly reviewed and compared with the present\nexperimental value.", "positive": "Gravitational Trapping for Extended Extra Dimension: The solution of Einsteins equations for 4-brane embedded in 5-dimensional\nAnti-de-Sitter space-time is found. It is shown that the cosmological constant\ncan provide the existence of ordinary 4-dimensional Newton's low and trapping\nof a matter on the brane." }, { "anchor": "Radiative $\u039e_{b}^{-}\\rightarrow \u039e^{-}\u03b3$ decay: Recently, the LHCb Collaboration performed first search for the rare\nradiative $\\Xi_{b}^{-}\\rightarrow \\Xi^{-}\\gamma$ decay and put an upper limit,\n${\\cal B}(\\Xi_{b}^{-}\\to \\Xi^{-}\\gamma) < 1.3 \\times 10^{-4}$, on its branching\nratio. The measurement agrees well with existing theory prediction using SU(3)\nflavor symmetry method, but shows a slight tension with the previous prediction\nfrom light-cone sum rules. Inspired by this, we investigate this decay as well\nas other radiative decays of $\\Xi_b^{0(-)}(\\Xi^{'-}_{b})$ to $\\Xi^{0(-)}$ and\n$\\Sigma^{0(-)}$ baryons using the form factors calculated from light-cone QCD\nsum rules in full theory. we obtain $ {\\cal B}(\\Xi_{b}^{-}\\to\n\\Xi^{-}\\gamma)=1.08^{+0.63}_{-0.49} \\times 10^{-5} $, which lies below the\nupper limit set by LHCb and is consistent with flavor-symmetry driven\nprediction. Our predictions on other channels may be checked in experiment and\nby other phenomenological approaches.", "positive": "Summary of the CKM 2010 Working Group on Rare Decays: Rare decays were essential in the discovery of the CKM mechanism of flavour\nand CP violation and are highly sensitive probes of physics beyond the Standard\nModel. In this summary the current status and future prospects of experimental\nmeasurements and the Standard Model theory predictions of various rare B, D and\nK decay observables are discussed. The specific new physics sensitivities of\neach mode are also briefly reviewed." }, { "anchor": "Threshold resummation for nonleptonic B meson decays: We investigate the double logarithmic corrections $\\alpha_s\\ln^2 x$, x being\na parton momentum fraction, in two-body nonleptonic B meson decays in collinear\nfactorization theorem of perturbative QCD (PQCD). It is found that these\ncorrections are universal for factorizable amplitudes, {\\it i.e.}, at the\nleading power, and that their threshold resummation smears the end-point\nsingularities from $x\\to 0$. The double logarithmic corrections, depending on\nthe topologies of nonfactorizable amplitudes at the subleading power, are\nnegligible due to the color-transparency argument and to the overlap of three\nmeson distribution amplitudes. We show that the PQCD approach to two-body\nnonleptonic B meson decays respects the factorization assumption in the\nheavy-quark limit.", "positive": "Supergravity Grand Unification, Proton Decay and Cosmological\n Constraints: Properties and experimental predictions of a broad class of supergravity\ngrand unified models possessing an $SU(5)$-type proton decay and $R$ parity are\ndescribed. Models of this type can be described in terms of four parameters at\nthe Gut scale in addition to those of the Standard Model i.e. $m_o$ (universal\nscalar mass), $m_{1/2}$ (universal gaugino mass), $A_o$ (cubic soft breaking\nparameter) and $\\tan\\beta=/$. Thus the 32 SUSY masses can be\nexpressed in terms of $m_o, m_{1/2}, A_o \\tan\\beta$ and the as yet unknown\nt-quark mass $m_t$. Gut thresholds are examined and a simple model leads to\ngrand unification consistent with $p$-decay data when $0.114<\\alpha_3\n(M_z)<0.135$, in agreement with current values of $\\alpha_3 (M_Z)$.Proton decay\nis examined for the superheavy Higgs triplet mass $M_{H_3}<10M_G(M_G\\simeq 1.5\n\\times10^{16}$~GeV) and squarks and gluinos lighter than 1 TeV. Throughout most\nof the parameter space chargino-neutralino scaling relations are predicted to\nhold: $2m_{\\tilde{Z}_1}\\cong m_{\\tilde{W}_1}\\cong m_{\\tilde{Z}_2},\nm_{\\tilde{W}_1}\\simeq(1/4)m_{\\tilde{g}}$ (for $\\mu>0$) or $m_{\\tilde{W}_1}\n\\simeq(1/3)m_{\\tilde{g}}$ (for $\\mu<0$), while $m_{\\tilde{W}_2}\\cong\nm_{\\tilde{Z}_3}\\cong m_{\\tilde{Z}_4}>>m_{\\tilde{Z}_1}$. Future proton decay\nexperiments combined with LEP2 lead to further predictions, e.g. for the entire\nparameter space either proton decay should be seen at these or the$\\tilde{W}_1$\nseen at LEP2. Relic density constraints on the $\\tilde{Z}_1$ further constrain\nthe parameter space e.g. so that $m_t<165$~GeV, $m_h<105$~GeV, $m_{\\tilde{W}_1}\n<100$~GeV and $m_{\\tilde{Z}_1}<50$~GeV when $M_{H_3}/M_G < 6$. (Invited talk at\nLes Rencontres de Physique de la Vallee D'Aoste}" }, { "anchor": "Theory of eps'/eps: I shortly review the present status of the theoretical estimates of eps'/eps.\nI consider a few aspects of the theoretical calculations which may be relevant\nin understanding the present experimental results. I discuss the role of higher\norder chiral corrections and in general of non-factorizable contributions for\nthe explanation of the Delta I = 1/2 selection rule in kaon decays and\neps'/eps. Lacking reliable lattice calculations, the 1/N expansion and\nphenomenological approaches may help in understanding correlations among\ntheoretical effects and the experimental data. The same dynamics which\nunderlies the CP conserving selection rule appears to drive eps'/eps in the\nrange of the recent experimental measurements.", "positive": "Gluonic effects in eta- and etaprime-nucleon and nucleus interactions: Gluonic degrees of freedom play an important role in the masses of the eta\nand etaprime mesons. We discuss eta- and etaprime-nucleon and nucleus\ninteractions where this glue may be manifest. Interesting processes being\nstudied in experiments are etaprime production in proton-nucleon collisions\nclose to threshold and possible eta-nucleus bound-states." }, { "anchor": "Constraints on the virtual Compton scattering on the nucleon in a new\n dispersive formalism: The dispersive representation of the virtual Compton forward scattering\namplitude has been recently reexamined in connection with the evaluation of the\nCottingham formula for the proton-neutron electromagnetic mass difference. The\nmost difficult part of the analysis is related to one of the invariant\namplitudes, denoted as $T_1(\\nu, Q^2)$, which requires a subtraction in the\nstandard dispersion relation with respect to the energy $\\nu$ at fixed photon\nmomentum squared $q^2=-Q^2$. We propose an alternative dispersive framework,\nwhich implements analyticity and unitarity by combining the Cauchy integral\nrelation at low and moderate energies with the modulus representation of the\namplitude at high energies. Using techniques of functional analysis, we derive\na necessary and sufficient condition for the consistency with analyticity of\nthe subtraction function $S_1(Q^2)=T_1(0, Q^2)$, the electron-proton cross\nsections measured at low and moderate energies and the Regge model assumed to\nbe valid at high energies. From this condition we obtain model-independent\nconstraints on the subtraction function, confronting them with the available\ninformation on nucleon magnetic polarizabilities and results reported recently\nin the literature. The formalism can be used also for testing the existence of\na fixed pole at $J=0$ in the angular momentum plane, but more accurate data are\nnecessary for a definite answer.", "positive": "Gluon-Photon mixing in dense QCD: At high baryonic density with the formation of a diquark condensate $\\Delta\n\\neq 0$, the QCD color symmetry is spontaneously broken.\n Being massive by the Anderson-Higgs mechanism, gluon and photon should mix\ntogether within two linear combinations due to the color non-conservation.\nConsequently a gluon $\\widetilde{G}$ could decay into an $e^- e^+$ pair via its\nphoton component. With a low invariant mass (about a few ten MeV) and an\nextremely narrow width peaking above the continuum background, the purely\nleptonic decay of a strongly-interacting gluon $\\widetilde{G} \\to e^- + e^+$\nconstitutes a very distinctive signature of the color superconductivity phase.\nBy a similar scenario of gluon-$Z$ mixing, another \"missing-energy\" decay into\ninvisible neutrinos $\\widetilde{G} \\to \\nu +\\bar{\\nu}$ could arise, its\namplitude is however $(\\Delta/M_Z)^2$ power-suppressed." }, { "anchor": "Neutrinophilic Dark Matter in the epoch of IceCube and Fermi-LAT: The recent observation of the blazar TXS 0506+056 suggests the presence of a\nhard power-law component in the extraterrestrial TeV-PeV neutrino flux, in\nagreement with the IceCube analysis on the 8-year through-going muon neutrinos\nfrom the Northern Sky. This is slightly in tension with the soft power-law\nneutrino flux deduced by the IceCube 6-year High Energy Starting Events data. A\npossible solution to such a puzzle is assuming a two-component neutrino flux.\nIn this paper, we focus on the case where, in addition to an astrophysical\npower-law, the second component is a pure neutrino line produced by decaying\nDark Matter particles. We investigate how to realize a neutrinophilic decaying\nDark Matter in an extension of the Standard Model. The main features of the\nmodel are: i) the requirement of a new symmetry like a global $U(1)$ charge;\nii) the Dirac nature of active neutrinos; iii) a low-reheating temperature of\nthe Universe of about 1 TeV. We perform a likelihood statistical analysis to\nfit the IceCube data according to the present Fermi-LAT gamma-rays constraints.", "positive": "Perturbative Corrections to Heavy Quark-Diquark Symmetry Predictions for\n Doubly Heavy Baryon Hyperfine Splittings: Doubly heavy baryons $\\left(QQq\\right)$ and singly heavy antimesons\n$\\left(\\bar{Q}q\\right)$ are related by the heavy quark-diquark (HQDQ) symmetry\nbecause in the $m_Q \\to \\infty$ limit, the light degrees of freedom in both the\nhadrons are expected to be in identical configurations. Hyperfine splittings of\nthe ground states in both systems are nonvanishing at $O(1/m_Q)$ in the heavy\nquark mass expansion and HQDQ symmetry relates the hyperfine splittings in the\ntwo sectors. In this paper, working within the framework of Non-Relativistic\nQCD (NRQCD), we point out the existence of an operator that couples four heavy\nquark fields to the chromomagnetic field with a coefficient that is enhanced by\na factor from Coulomb exchange. This operator gives a correction to doubly\nheavy baryon hyperfine splittings that scales as $1/m_Q^2 \\times \\alpha_S/r$,\nwhere $r$ is the separation between the heavy quarks in the diquark. This\ncorrection can be calculated analytically in the extreme heavy quark limit in\nwhich the potential between the quarks in the diquark is Coulombic. In this\nlimit, the correction is $O(\\alpha_s^2/m_Q)$ and comes with a small\ncoefficient. For values of $\\alpha_s$ relevant to doubly charm and doubly\nbottom systems, the correction to the hyperfine splittings in doubly heavy\nbaryons is only a few percent or smaller. We also argue that nonperturbative\ncorrections to the prediction for the hyperfine splittings are suppressed by\n$\\Lambda^2_{\\rm QCD}/m_Q^2$ rather than $\\Lambda_{\\rm QCD}/m_Q$. Corrections\nshould be $\\approx 10\\%$ in the charm sector and smaller in heavier systems." }, { "anchor": "A Note on One Loop Electroweak Contributions to g-2: a Companion to\n BUHEP-01-16: In this note we present general expressions at one loop order that can be\nused to calculate the contributions to the anomalous magnetic moment of\nfundamental, charged Dirac fermions. In particular, we provide the expressions\nfor charged and neutral scalar and charged and neutral gauge boson\ncontributions with general vector and axial couplings to the fermion of\ninterest. The calculations presented in this note were originally derived for\nuse in the author's letter, hep-ph/0108080. We have chosen to document and make\navailable the results and derivations in the hope that they will also be useful\nto others. Our expressions reproduce the Standard Model electroweak\ncontributions to a_muon in the appropriate mass limits, and are flexible enough\nto allow us to handle many scenarios of new physics beyond the Standard Model.", "positive": "Viability of MSSM scenarios at very large tan(beta): We investigate the MSSM with very large tan(beta) > 50, where the fermion\nmasses are strongly affected by loop-induced couplings to the \"wrong\" Higgs,\nimposing perturbative Yukawa couplings and constraints from flavour physics.\nPerforming a low-energy scan of the MSSM with flavour-blind soft terms, we find\nthat the branching ratio of B->tau nu and the anomalous magnetic moment of the\nmuon are the strongest constraints at very large tan(beta) and identify the\nviable regions in parameter space. Furthermore we determine the scale at which\nthe perturbativity of the Yukawa sector breaks down, depending on the\nlow-energy MSSM parameters. Next, we analyse the very large tan(beta) regime of\nGeneral Gauge Mediation (GGM) with a low mediation scale. We investigate the\nrequirements on the parameter space and discuss the implied flavour\nphenomenology. We point out that the possibility of a vanishing Bmu term at a\nmediation scale M = 100 TeV is challenged by the experimental data on B->tau nu\nand the anomalous magnetic moment of the muon." }, { "anchor": "A Conserved Vector Current test using low energy beta-beams: We discuss the possibility of testing the weak currents and, in particular,\nthe weak magnetism term through the measurement of the electron anti-neutrinos\ncapture by protons at a low energy beta-beam facility. We analyze the\nsensitivity using both the total number of events and the angular distribution\nof the positrons emitted in a water Cerenkov detector. We show that the weak\nmagnetism form factor might be determined with better than several percent\naccuracy using the angular distribution. This offers a new way of testing the\nConserved Vector Current hypothesis.", "positive": "Complementarity of muon-conversion and linear collider-based experiments\n for lepton-flavor violating U(1) gauge bosons: In general, attempts to extend the standard model will include extra gauge\nstructure. We parameterize string and technicolor models for a Z' boson with\nprimitive lepton flavor violating interactions. Calculations for its muon\nconversion rate (mu N -> e N) on Titanium are made and used to show the\npotential of forthcoming experiments MECO at Brookhaven National Laboratory and\nPRIME at the Japan Hadron Facility (to be renamed). For reasonable choices of\nparameters, such U(1) bosons with masses the order 10 TeV and mu-e Z' charge as\nlow as ~10^-5 are demonstrated to be accessible for MECO and PRIME. Also, a\ndemonstration of the complementarity of parameter space coverage for future\ncolliders and muon conversion experiments is given." }, { "anchor": "Imprints of Cosmic Phase Transition in Inflationary Gravitational Waves: We discuss the effects of cosmic phase transition on the spectrum of\nprimordial gravitational waves generated during inflation. The energy density\nof the scalar condensation responsible for the phase transition may become\nsizable at the epoch of phase transition, which significantly affects the\nevolution of the universe. As a result, the amplitudes of the gravitational\nwaves at high frequency modes are suppressed. Thus the gravitational wave\nspectrum can be a probe of phase transition in the early universe.", "positive": "Quark Masses: An Environmental Impact Statement: We investigate worlds that lie on a slice through the parameter space of the\nStandard Model over which quark masses vary. We allow as many as three quarks\nto participate in nuclei, while fixing the mass of the electron and the average\nmass of the lightest baryon flavor multiplet. We classify as \"congenial\" worlds\nthat satisfy the environmental constraint that the quark masses allow for\nstable nuclei with charges one, six, and eight, making organic chemistry\npossible. Whether a congenial world actually produces observers depends on a\nmultitude of historical contingencies, beginning with primordial\nnucleosynthesis, which we do not explore. Such constraints may be independently\nsuperimposed on our results. Environmental constraints such as the ones we\nstudy may be combined with information about the a priori distribution of quark\nmasses over the landscape of possible universes to determine whether the\nmeasured values of the quark masses are determined environmentally, but our\nanalysis is independent of such an anthropic approach.\n We estimate baryon masses as functions of quark masses and nuclear masses as\nfunctions of baryon masses. We check for the stability of nuclei against\nfission, strong particle emission, and weak nucleon emission. For two light\nquarks with charges 2/3 and -1/3, we find a band of congeniality roughly 29 MeV\nwide in their mass difference. We also find another, less robust region of\ncongeniality with one light, charge -1/3 quark, and two heavier, approximately\ndegenerate charge -1/3 and 2/3 quarks. No other assignment of light quark\ncharges yields congenial worlds with two baryons participating in nuclei. We\nidentify and discuss the region in quark-mass space where nuclei would be made\nfrom three or more baryon species." }, { "anchor": "Soft and hard QCD in charmonium production: Hard and soft QCD dynamics are both important in charmonium hadroproduction,\nas presented here through a next-to-leading order QCD matrix element\ncalculation combined with the colour evaporation model. Observed $x_F$ and\n$p_\\perp$ distributions of $J/\\psi$ in hadroproduction are reproduced. Quite\nsimilar results can also be obtained with a Monte Carlo event generator where\n\\ccbar pairs are instead produced through leading order matrix elements and the\nparton shower approximation of higher order processes. The soft dynamics may\nalternatively be described by the soft colour interaction model. We also\ndiscuss the relative rates of different charmonium states and introduce an\nimproved model for mapping the continuous ccbar mass spectrum on the physical\ncharmonium resonances.", "positive": "Back to 1974: The $\\mathcal Q$-onium: We show that the 750 GeV di-photon excess could be explained by the\n${\\mathcal Q}-$onium system of a new QCD-like theory with fermions vectorial\nunder the SM. Beside the spin-0 di-photon singlet this scenario predicts almost\ndegenerate colored scalars and spin-1 resonances analogous to the $J/\\Psi$ in\nQCD. All these states are within the reach of the LHC. An apparent large width\ncan be explained as due to production of excited states with splitting $\\Delta\nm\\sim \\Gamma$." }, { "anchor": "Precise determination of proton magnetic radius from electron scattering\n data: We extract the proton magnetic radius from the high-precision electron-proton\nelastic scattering cross section data. Our theoretical framework combines\ndispersion analysis and chiral effective field theory and implements the\ndynamics governing the shape of the low-$Q^2$ form factors. It allows us to use\ndata up to $Q^2\\sim$ 0.5 GeV$^2$ for constraining the radii and overcomes the\ndifficulties of empirical fits and $Q^2 \\rightarrow 0$ extrapolation. We obtain\na magnetic radius $r_M^p$ = 0.850 $\\pm$0.001 (fit 68%) $\\pm$0.010 (theory full\nrange) fm, significantly different from earlier results obtained from the same\ndata, and close to the extracted electric radius $r_E^p$ = 0.842 $\\pm$0.002\n(fit) $\\pm$0.010 (theory) fm.", "positive": "Finite width effects in the model of unstable particles with random mass: A phenomenological model of unstable particles based on uncertainty principle\nis discussed in quantum field approach. We show that the simplest quantum field\ndescription of mass uncertainty makes it possible to account finite width\neffects for particles with large decay widths." }, { "anchor": "Light Dark Matter from Inelastic Cosmic Ray Collisions: Direct detection experiments relying on nuclear recoil signatures lose\nsensitivity to sub-GeV dark matter for typical galactic velocities. This\nsensitivity is recovered if there exists another source of flux with higher\nmomenta. Such an energetic flux of light dark matter could originate from the\ndecay of mesons produced in inelastic cosmic ray collisions. We compute this\nnovel production mechanism---a cosmic beam dump experiment---and estimate the\nresulting limits from XENON1T and LZ. We find that the dark matter flux from\ninelastic cosmic rays colliding with atmospheric nuclei can dominate over the\nflux from elastic collisions with relic dark matter. The limits that we obtain\nfor hadrophilic scalar mediator models are competitive with those from\nMiniBoone for light MeV-scale mediator masses.", "positive": "Muon and electron $g-2$ and lepton masses in flavor models: The stringent experimental bound on $\\mu \\rightarrow e \\gamma$ is compatible\nwith a simultaneous and sizable new physics contribution to the electron and\nmuon anomalous magnetic moments $(g-2)_\\ell$ ($\\ell=e,\\,\\mu$), only if we\nassume a non-trivial flavor structure of the dipole operator coefficients. We\npropose a mechanism in which the realization of the $(g-2)_\\ell$ correction is\nmanifestly related to the mass generation through a flavor symmetry. A\nradiative flavon correction to the fermion mass gives a contribution to the\nanomalous magnetic moment. In this framework, we introduce a chiral enhancement\nfrom a non-trivial $\\mathcal{O}(1)$ quartic coupling of the scalar potential.\nWe show that the muon and electron anomalies can be simultaneously explained in\na vast region of the parameter space with predicted vector-like mediators of\nmasses as large as $M_\\chi\\in [0.6,2.5]$~TeV." }, { "anchor": "Lepton-number-violating decays of heavy flavors induced by\n doubly-charged Higgs boson: We study lepton-number-violating (LNV) decays of heavy flavors ($\\tau$ lepton\nand top quark) induced by doubly-charged Higgs boson in the Higgs triplet\nmodel. It is found that the branching fractions of LNV $\\tau^- \\to\n\\ell^{+}M_1^-M_2^-$ decays are highly suppressed compared with the current\nexperimental limits. On the other hand, for LNV top quark decays, the most\noptimistic branching ratios for $t \\to b\\ell^{+}\\ell^{+}W^{-}$ turn out to be\nat the level of $\\sim 10^{-7} - 10^{-8}$. The observation of these rare top\nquark decays would be a clear signal of LNV processes, and their\nnon-observation would allow us to constraint the parameters of the Higgs\ntriplet model.", "positive": "Simulating W/Z+jets production at the CERN LHC: The merging procedure of tree-level matrix elements and the subsequent parton\nshower as implemented in the new event generator SHERPA will be validated for\nthe example of single gauge boson production at the LHC. The validation\nincludes consistency checks and comparisons to results obtained from other\nevent generators. In particular, comparisons with full next-to-leading order\nQCD calculations prove SHERPA's ability to correctly account for additional\nhard QCD radiation present in these processes." }, { "anchor": "Looking for defects in the 2PI correlator: Truncations of the 2PI effective action are seen as a promising way of\nstudying non-equilibrium dynamics in quantum field theories. We probe their\napplicability in the non-perturbative setting of topological defect formation\nin a symmetry-breaking phase transition, by comparing full classical lattice\nfield simulations and the 2PI formulation for classical fields in an O($N$)\nsymmetric scalar field theory. At next-to-leading order in 1/N, the 2PI\nformalism fails to reproduce any signals of defects in the two-point function.\nThis suggests that one should be careful when applying the 2PI formalism for\nsymmetry breaking phase transitions.", "positive": "Three-loop Phi-derivable Approximation in QED: In this paper we examine Phi-derivable approximations in QED. General\ntheorems tell us that the gauge dependence of the n-loop Phi-derivable\napproximation shows up at order g^(2n) where g is the coupling constant. We\nconsider the gauge dependence of the two-loop Phi-derivable approximation to\nthe Debye mass and show that it is of order e^4 as expected. We solve the\nthree-loop Phi-derivable approximation in QED by expanding sum-integrals in\npowers of e^2 and m/T, where m is the Debye mass which satisfies a variational\ngap equation. The results for the pressure and the Debye mass are accurate to\norder e^5." }, { "anchor": "Multiboson signals in the UN2HDM: We address multiboson production from a heavy $Z'$ resonance in the context\nof the UN2HDM, a standard model extension with an additional $\\text{U}(1)'$\nsymmetry and an enlarged scalar sector with an extra doublet and a singlet.\nAfter taking into account theoretical and experimental constraints on the\nmodel, it turns out this type of signals - mostly uncovered by current searches\n- could be sizeable. We focus on three benchmark scenarios, each of them\npredicting up to 4000 multiboson events with the LHC Run 2 collected\nluminosity. Anomaly-detection methods could uncover those signals, if present\nin data.", "positive": "Transport properties in magnetized compact stars: Transport properties of dense quark matter are discussed in the strong\nmagnetic field, B. B dependence as well as density dependence of the Hall\nconductivity is discussed in the inhomogeneous chiral phase. Anomalous Hall\neffect is intrinsic to the inhomogeneous chiral phase and resembles the one in\nWeyl semimetals in condensed matter physics. Some theoretical aspects inherent\nin anomalous Hall effect are revealed." }, { "anchor": "Skyrmion vibrational energies with a generalized mass term: We study various properties of a one parameter mass term for the Skyrme\nmodel, originating from the works of Kopeliovich, Piette and Zakrzewski,\nthrough the use of axially symmetric solutions obtained numerically by\nsimulated-annealing. These solutions allow us to observe asymptotic behaviors\nof the B=2 binding energies that differ to those previously obtained. We also\ndecipher the characteristics of three distinct vibrational modes that appear as\neigenstates of the vibrational Hamiltonian. This analysis further examine the\nassertion that the one parameter mass term offers a better account of baryonic\nmatter than the traditional mass term.", "positive": "Neutrinoless Double Beta Decay and Physics Beyond the Standard Model: The various mechanisms for neutrinoless double beta decay in gauge theories\nare reviewed and the present experimental data is used to set limits on physics\nscenarios beyond the standard model. The positive indications for nonzero\nneutrino masses in various experiments such as those involving solar,\natmospheric and accelerator neutrinos are discussed and it is pointed out how\nsome neutrino mass textures consistent with all data can be tested by the\nongoing double beta decay experiments. Finally, the outlook for observable\nneutrinoless double beta decay signal in grand unified theories is discussed." }, { "anchor": "Near threshold ppbar enhancement in the J/psi -> omega ppbar decay: The near-threshold behavior of the ppbar invariant mass spectrum from the\nJ/psi -> omega ppbar decay reported recently by the BES Collaboration is\nanalyzed. Contrary to the statement made by the BES Collaboration itself our\nstudy demonstrates that there is indeed a noticeable enhancement in the ppbar\ninvariant mass spectrum near threshold. Moreover, this enhancement is nicely\nreproduced by the final state interaction in the relevant 11S0 ppbar partial\nwave as given by the Julich nucleon--antinucleon model. Therefore, and again\ncontrary to the statement by the BES Collaboration, their new data on J/psi ->\nomega ppbar decay in fact strongly support the FSI interpretation of the ppbar\nenhancement, seen also in other decay reactions.", "positive": "CP Violating Metastable States and Baryogenesis in the Hot Standard\n Model: We discuss a novel form of CP violation in the standard model. It takes place\nat temperatures of the order of the electroweak transition, when two regions\nwith different values of the Wilson line are juxtaposed. This CP violation is\nmaximal. A sufficient condition is simply the existence of a long-lived\nmetastable state; this can occur for fewer than three generations, and also in\nthe minimal susy standard model. It leads to baryogenesis in all of these\nmodels." }, { "anchor": "Higher order conserved charge fluctuations inside the mixed phase: General formulas are presented for higher order cumulants of the conserved\ncharge statistical fluctuations inside the mixed phase. As a particular example\nthe van der Waals model in the grand canonical ensemble is used. The higher\norder measures of the conserved charge fluctuations up to the hyperkurtosis are\ncalculated in a vicinity of the critical point (CP). The analysis includes both\nthe mixed phase region and the pure phases on the phase diagram. It is shown\nthat even-order fluctuation measures, e.g. scaled variance, kurtosis, and\nhyperkurtosis, have only positive values in the mixed phase, and go to infinity\nat the CP. For odd-order measures, such as skewness and hyperskewness, the\nregions of positive and negative values are found near the left and right\nbinodals, respectively. The obtained results are discussed in a context of the\nevent-by-event fluctuation measurements in heavy-ion collisions.", "positive": "Global Fit of Modified Quark Couplings to EW Gauge Bosons and\n Vector-Like Quarks in Light of the Cabibbo Angle Anomaly: There are two tensions related to the Cabibbo angle of the CKM matrix. First,\nthe determinations of $V_{us}$ from $K_{\\mu 2}$, $K_{\\ell3}$, and $\\tau$ decays\ndisagree at the $3\\sigma$ level. Second, using the average of these results in\ncombination with $\\beta$ decays (including super-allowed $\\beta$ decays and\nneutron decay), a deficit in first-row CKM unitarity with a significance of\nagain about $3\\sigma$ is found. These discrepancies, known as the Cabibbo Angle\nanomaly, can in principle be solved by modifications of $W$ boson couplings to\nquarks. However, due to $SU(2)_L$ invariance, $Z$ couplings to quarks are also\nmodified and flavour changing neutral currents can occur. In order to\nconsistently assess the agreement of a new physics hypothesis with data, we\nperform a combined analysis for all dimension-six Standard Model Effective\nField Theory operators that generate modified $W$ couplings to first and second\ngeneration quarks. We then study models with vector-like quarks, which are\nprime candidates for a corresponding UV completion as they can affect $W$-quark\ncouplings at tree level, and we perform a global fit including flavour\nobservables (in particular loop effects in $\\Delta F=2$ processes). We find\nthat the best fit can be obtained for the $SU(2)_L$ doublet vector-like quark\n$Q$ as it can generate right-handed $W$-$u$-$d$ and $W$-$u$-$s$ couplings as\npreferred by data." }, { "anchor": "Effective potential between static sources in quenched light-front\n Yukawa theory: We compute a nonperturbative effective potential between two static fermions\nin light-front Yukawa theory as a Hamiltonian eigenvalue problem. Fermion pair\nproduction is suppressed, to make possible an exact analytic solution in the\nform of a coherent state of bosons that form clouds around the sources. The\neffective potential is essentially an interference term between individual\nclouds. The model is regulated with Pauli-Villars bosons and fermions, to\nachieve consistent quantization and renormalization of masses and couplings.\nThis extends earlier work on scalar Yukawa theory where Pauli-Villars\nregularization did not play a central role. The key result is that the\nnonperturbative solution restores rotational symmetry even though the\nlight-front formulation of Yukawa theory, with its preferred axis, appears\nantithetical to such a symmetry.", "positive": "$\u03b5'/\u03b5$ from charged-Higgs-induced gluonic dipole operators: We study the effect of charged-Higgs-induced chromomagnetic operator,\n$Q_{8G}(-) \\equiv \\bar s \\sigma^{\\mu \\nu} T^a \\gamma_5 d G^a_{\\mu \\nu}$, on the\nKaon direct CP violation $Re(\\epsilon'/\\epsilon)$. Using the matrix element\n$\\langle \\pi \\pi | O_{8G}(-) | K^0 \\rangle$ recently obtained by a large $N_c$\ndual QCD approach, we find that if the Kobayashi-Maskawa phase is the origin of\nCP violation, the charged-Higgs-induced gluon penguin dipole operator in the\ntype-III two-Higgs-doublet model can explain the measured\n$Re(\\epsilon'/\\epsilon)$ when the constraints from the relevant low energy\nflavor physics, such as $\\Delta B(K)=2$, $B\\to X_s \\gamma$, and Kaon indirect\nCP violation parameter $\\epsilon$, are included." }, { "anchor": "Factorization Breaking in Diffractive Photoproduction of Dijets: We have calculated the diffractive dijet cross section in low-Q^2 ep\nscattering in the HERA regime. The results of the calculation in LO and NLO are\ncompared to recent experimental data of the H1 collaboration. We find that in\nLO the calculated cross sections are in reasonable agreement with the\nexperimental results. In NLO, however, some of the cross sections disagree,\nshowing that factorization breaking occurs in that order. By suppressing the\nresolved contribution by a factor of approximately three, good agreement with\nall the data is found. The size of the factorization breaking effects in\ndiffractive dijet photoproduction agrees well with absorptive model\npredictions.", "positive": "Twist-3 Distribution Amplitudes of K* and phi Mesons: We present a systematic study of twist-3 light-cone distribution amplitudes\nof $K^*$ and $\\phi$ mesons in QCD. The structure of SU(3)-breaking corrections\nis studied in detail. Non-perturbative input parameters are estimated from QCD\nsum rules. As a by-product, we update the parameters describing the twist-3\ndistribution amplitudes of the $\\rho$ meson. We also review and update\npredictions for the twist-2 distribution amplitudes of $\\rho$, $K^*$ and\n$\\phi$." }, { "anchor": "Pseudo-Goldstone Dark Matter Model with CP violation: We consider an explicitly CP-violating model with two Higgs doublets and one\ncomplex singlet scalar. The singlet $S$ is charged under a global $\\rm U(1)$\nsymmetry which is softly broken by a mass term $\\mu^2 S^2+\\hc$. Imaginary part\nof $S$ is a stable dark matter candidate which at the tree level, in the limit\nof zero momentum transfer, decouples from nucleons naturally satisfying all\nexisting direct detection limits on dark matter scattering cross-section. It is\nexplicitly shown that within this framework in the alignment limit CP-violation\nis still present in contrast to a popular version of a 2-Higgs doublet model\nwith softly broken $Z_2$ symmetry. In this context, we investigate dark matter\nimplications of the model both with and without CP violation in the scalar\nsector. In particular, dark matter relic abundance is calculated and the\npossibility for its indirect detection is discussed.", "positive": "Parton Fragmentation within an Identified Jet at NNLL: The fragmentation of a light parton i to a jet containing a light energetic\nhadron h, where the momentum fraction of this hadron as well as the invariant\nmass of the jet is measured, is described by \"fragmenting jet functions\". We\ncalculate the one-loop matching coefficients J_{ij} that relate the fragmenting\njet functions G_i^h to the standard, unpolarized fragmentation functions D_j^h\nfor quark and gluon jets. We perform this calculation using various IR\nregulators and show explicitly how the IR divergences cancel in the matching.\nWe derive the relationship between the coefficients J_{ij} and the quark and\ngluon jet functions. This provides a cross-check of our results. As an\napplication we study the process e+ e- to X pi+ on the Upsilon(4S) resonance\nwhere we measure the momentum fraction of the pi+ and restrict to the dijet\nlimit by imposing a cut on thrust T. In our analysis we sum the logarithms of\ntau=1-T in the cross section to next-to-next-to-leading-logarithmic accuracy\n(NNLL). We find that including contributions up to NNLL (or NLO) can have a\nlarge impact on extracting fragmentation functions from e+ e- to dijet + h." }, { "anchor": "Doubly Charged Higgs Production at Future $ep$ Colliders: The Higgs sector of the standard model can be extended by introducing an\n$SU(2)_L$ Higgs triplet $\\Delta$ to generate the tiny neutrino masses in the\nframework of type-II seesaw mechanism. In this paper, we study the pair\nproduction of the introduced Higgs triplet at future $e^{-}p$ colliders. The\ncorresponding production cross sections via vector boson fusion process at\nFCC-ep and ILC$\\otimes$FCC are predicted, where the production of a pair of\ndoubly charged Higgs is found to be dominant and then used to investigate the\ncollider phenomenology of the Higgs triplet. Depending on the size of the Higgs\ntriplet vacuum expectation value, the doubly charged Higgs may decay into a\npair of same-sign charged leptons or a pair of same-sign $W$ bosons. In order\nto explore the discovery potential of the doubly charged Higgs at future\n$e^{-}p$ colliders, we discuss these two decay scenarios in detail and show\nrespectively the detection sensitivity on the mass of the doubly charged Higgs.", "positive": "Implications of Canonical Gauge Coupling Unification in High-Scale\n Supersymmetry Breaking: We systematically construct two kinds of models with canonical gauge coupling\nunification and universal high-scale supersymmetry breaking. In the first we\nintroduce standard vector-like particles while in the second we also include\nnon-standard vector-like particles. We require that the gauge coupling\nunification scale is from 5 x 10^{15} GeV to the Planck scale, that the\nuniversal supersymmetry breaking scale is from 10 TeV to the unification scale,\nand that the masses of the vector-like particles (M_V) are universal and in the\nrange from 200 GeV to 1 TeV. Using two-loop renormalization group equation\n(RGE) running for the gauge couplings and one-loop RGE running for Yukawa\ncouplings and the Higgs quartic coupling, we calculate the supersymmetry\nbreaking scales, the gauge coupling unification scales, and the corresponding\nHiggs mass ranges. When the vector-like particle masses are less than 1 TeV,\nthese models can be tested at the LHC." }, { "anchor": "Completing the Standard Model with right-handed neutrinos and Z': In this lecture I review the most relevant modifications of the Standard\nModel of particle physics that result from inclusion of right-handed neutrinos\nand a new neutral gauge boson Z'.", "positive": "Automatized analytic continuation of Mellin-Barnes integrals: I describe a package written in MATHEMATICA that automatizes typical\noperations performed during evaluation of Feynman graphs with Mellin-Barnes\n(MB) techniques. The main procedure allows to analytically continue a MB\nintegral in a given parameter without any intervention from the user and thus\nto resolve the singularity structure in this parameter. The package can also\nperform numerical integrations at specified kinematic points, as long as the\nintegrands have satisfactory convergence properties. I demonstrate that, at\nleast in the case of massive graphs in the physical region, the convergence may\nturn out to be poor, making naive numerical integration of MB integrals\nunusable. I present possible solutions to this problem, but argue that full\nautomatization in such cases may not be achievable." }, { "anchor": "The $B_c$ meson and its scalar cousin with the QCD sum rules: In this work, we use optical theorem to calculate the next-to-leading order\ncorrections to the spectral densities directly in the QCD sum rules for the\npseudoscalar and scalar $B_c$ mesons. We take the experimental data as guides\nto perform updated analysis, and obtain the masses and decay constants,\ntherefore the leptonic decay widths, which can be confronted to the\nexperimental data in the future.", "positive": "Higher order string effects and the properties of the Pomeron: We revisit the description of the Pomeron within the effective string theory\nof QCD. Using a string duality relation, we show how the static potential maps\nonto the high-energy scattering amplitude that exhibits the Pomeron behavior.\nBesides the Pomeron intercept and slope, new additional terms stemming from the\nhigher order string corrections are shown to affect both the growth of the\nnucleon's size at high energies and its profile in impact parameter space. The\nstringy description also allows for an odderon that only disappears in critical\ndimension. Some of the Pomeron's features that emerge within the effective\nstring description can be studied at the future EIC collider." }, { "anchor": "Three-Body Non-Leptonic B Decays and QCD Factorization: We extend the framework of QCD factorization to non-leptonic $B$ decays into\nthree light mesons, taking as an example the decay $B^+ \\to \\pi^+ \\pi^+ \\pi^-$.\nWe discuss the factorization properties of this decay in different regions of\nphase space. We argue that, in the limit of very large $b$-quark mass, the\ncentral region of the Dalitz plot can be described in terms of the $B \\to \\pi$\nform factor and the $B$ and $\\pi$ light-cone distribution amplitudes. The edges\nof the Dalitz plot, on the other hand, require different non-perturbative\ninput: the $B \\to \\pi \\pi$ form factor and the two-pion distribution amplitude.\nWe present the set-up for both regions to leading order in both $\\alpha_s$ and\n$\\Lambda_{\\rm QCD} / m_b$ and discuss how well the two descriptions merge. We\nargue that for realistic $B$-meson masses there is no perturbative center in\nthe Dalitz plot, but that a systematic description might be possible in the\ncontext of two-pion states. As an example, we estimate the $B\\to\\rho\\pi$\nbranching fraction beyond the quasi-particle approximation. We also discuss the\nprospects for studies of three-body and quasi-two-body non-leptonic $B$ decays\nfrom QCD.", "positive": "Analysis of the $X_0(2900)$ as the scalar tetraquark state via the QCD\n sum rules: In this article, we study the axialvector-diquark-axialvector-antidiquark\n($AA$) type and scalar-diquark-scalar-antidiquark ($SS$) type fully open flavor\n$cs\\bar{u}\\bar{d}$ tetraquark states with the spin-parity $J^P={0}^+$ via the\nQCD sum rules. The predicted masses $M_{AA}=2.91\\pm0.12\\,\\rm{GeV}$ and\n$M_{SS}=3.05\\pm0.10\\,\\rm{GeV}$ support assigning the $X_0(2900)$ to be the\n$AA$-type scalar $cs\\bar{u}\\bar{d}$ tetraquark state." }, { "anchor": "CP Violation and FCNC in the Third Family from Effective Supersymmetry: I discuss a ``more minimal'' modification of the minimal supersymmetric\nstandard model, in which supersymmetry breaking is connected with the physics\nof flavor. Flavor Changing Neutral Currents (FCNC) for the first two families\nare suppressed, and for the third family may be of comparable size to the FCNC\nin the Standard Model.", "positive": "Testing the nature of the $\u039b$(1520) in the\n $J/\u03c8\\to\\bar\u039bK^-p$ and $J/\u03c8\\to\\bar\u039b\u03c0^+\u03c0^-\u039b$\n reactions: We study the reactions $J/\\psi\\to\\bar{\\Lambda}K^-p$ and\n$J/\\psi\\to\\bar{\\Lambda}\\pi^+\\pi^-\\Lambda$ with a unitary chiral approach. We\npredict the ratio of the invariant mass distributions of these two reactions at\nthe $\\Lambda(1520)$ peak position, which is free of the unknown production\nmechanism and reflects only the properties of the $\\Lambda(1520)$. An\nexperimental measurement of this ratio will provide the couplings of the\n$\\Lambda(1520)$ to its decay channels, allowing to test the predictions of the\nchiral unitary approach on this resonance, which appears as dynamically\ngenerated in that approach." }, { "anchor": "On the two-loop corrections to the Higgs mass in trilinear R-parity\n violation: We study the impact of large trilinear R-parity violating couplings on the\nlightest CP-even Higgs boson mass in supersymmetric models. We use the publicly\navailable computer codes SARAH and SPheno to compute the leading two-loop\ncorrections. We use the effective potential approach. For not too heavy third\ngeneration squarks (< 1 TeV) and couplings close to the unitarity bound we find\npositive corrections up to a few GeV in the Higgs mass.", "positive": "Neutrinoless Double Beta Decay with Negligible Neutrino Mass: If the electron neutrino has an effective nonzero Majorana mass, then\nneutrinoless double beta decay will occur. However, the latter is possible also\nwith a negligible neutrino mass. We show how this may happen in a simple model\nof scalar diquarks and dileptons. This possibility allows neutrino masses to be\nsmall and hierarchical, without conflicting with the possible experimental\nevidence of neutrinoless double beta decay." }, { "anchor": "Vacuum (meta-)stability in the $\u03bc\u03bd$SSM: We perform an analysis of the vacuum stability of the neutral scalar\npotential of the $\\mu$-from-$\\nu$ Supersymmetric Standard Model ($\\mu\\nu$SSM).\nAs an example scenario, we discuss the alignment-without-decoupling limit of\nthe $\\mu\\nu$SSM, for which the required conditions on the Higgs sector are\nderived. We demonstrate that in this limit large parts of the parameter space\nfeature unphysical minima that are deeper than the electroweak minimum. In\norder to estimate the lifetime of the electroweak vacuum, we calculate the\nrates for the tunneling process into each unphysical minimum. We find that in\nmany cases the resulting lifetime is longer than the age of the universe, such\nthat the considered parameter region is not excluded. On the other hand, we\nalso find parameter regions in which the electroweak vacuum is short-lived. We\ninvestigate how the different regions of stability are related to the presence\nof light right-handed sneutrinos. Accordingly, a vacuum stability analysis that\naccurately takes into account the possibility of long-lived metastable vacua is\ncrucial for a reliable assessment of the phenomenological viability of the\nparameter space of the $\\mu\\nu$SSM and its resulting phenomenology at the\n(HL)-LHC.", "positive": "Andreev reflection at Hadron/Color superconductor interface: We consider the phenomenon of the Andreev reflection of \"hadrons\" at the\ninterface between hadronic and color superconducting phases, which are expected\nto appear in the neutron star interior. Here, hadrons are defined as a\nsuperposition of constituent quarks, each of which is Andreev-reflected. We\nstudy what kind of reflections are possible to come out of incident mesons and\nbaryons in the hadronic phase, attached to different color superconducting\nphases. Then, some peculiar patterns of the reflections are obtained." }, { "anchor": "Damping of an oscillating scalar field indirectly coupled to a thermal\n bath: The damping process of a homogeneous oscillating scalar field that indirectly\ninteracts with a thermal bath through a mediator field is investigated over a\nwide range of model parameters. We consider two types of mediator fields, those\nthat can decay to the thermal bath and those that are individually stable but\npair annihilate. The former case has been extensively studied in the literature\nby treating the damping as a local effect after integrating out the assumed\nclose-to-equilibrium mediator field. The same approach does not apply if the\nmediator field is stable and freezes out of equilibrium. To account for the\nlatter case, we adopt a non-local description of damping that is only\nmeaningful when we consider full half-oscillations of the field being damped.\nThe damping rates of the oscillating scalar field and the corresponding heating\nrate of the thermal bath in all bulk parameter regions are calculated in both\ncases, corroborating previous results in the direct decay case. Using the\nobtained results, the time it takes for the amplitude of the scalar field to be\nsubstantially damped is estimated.", "positive": "Does $K_L-K_S$ mass difference constraints or \\\\ claims new physics\n beyond the Standard Model?: The ratio $\\Delta m_K/m_K$ within the standard model with 3 generations is\ncalculated as a function of the CP nonconserving phase $\\delta_{13}$ and the\nquark masses $m_c,m_t$ assuming the current values of the\nCabibbo-Kobayashi-Maskawa mixing angles. We have found that varying\n$\\delta_{13}$ and $m_c$ within the allowed range, not all the values for the\ntop quark mass fit the experimental value for that ratio." }, { "anchor": "Entropy production in the Early Universe. A new mechanism: We expose briefly the role of entropy in the early universe and in particular\nthe importance of searching for new mechanisms of entropy production. We\ndescribe a mechanism that shows how entropy is produced during early\nannihilations and under which conditions the production is not negligible. A\nMeV tau neutrino provides an interesting application.", "positive": "Quarkonium production in the LHC era: a polarized perspective: Polarization measurements are usually considered as the most difficult\nchallenge for the QCD description of quarkonium production. In fact, global\ndata fits for the determination of the non-perturbative parameters of\nbound-state formation traditionally exclude polarization observables and use\nthem as a posteriori verifications of the predictions, with perplexing results.\nWith a change of perspective, we move polarization data to the centre of the\nstudy, advocating that they actually provide the strongest fundamental\nindications about the production mechanisms, even before we explicitly consider\nperturbative calculations.\n Considering psi(2S) and Y(3S) measurements from LHC experiments and\nstate-of-the-art NLO short-distance calculations in the framework of\nnon-relativistic QCD factorization (NRQCD), we perform a search for a kinematic\ndomain where the polarizations can be correctly reproduced together with the\ncross sections, by systematically scanning the phase space and accurately\ntreating the experimental uncertainties. This strategy provides a\nstraightforward solution to the \"quarkonium polarization puzzle\" and reassuring\nsigns that the theoretical framework is reliable. At the same time, the results\nexpose unexpected hierarchies in the non-perturbative NRQCD parameters, that\nopen new paths towards the understanding of bound-state formation in QCD." }, { "anchor": "Interplay between Appearance and Disappearance Channels for Precision\n Measurements of $\u03b8_{23}$ and $\u03b4$: We discuss how the CP violating phase $\\delta$ and the mixing angle\n$\\theta_{23}$ can be measured precisely in an environment where there are\nstrong correlations between them. This is achieved by paying special attention\nto the mutual roles and the interplay between the appearance and the\ndisappearance channels in long-baseline neutrino oscillation experiments. We\nanalyze and clarify the general structure of the $\\theta_{23} - \\theta_{13} -\n\\delta$ degeneracy for both the appearance and disappearance channels in a more\ncomplete fashion than what has previously been discussed in the literature. A\nfull understanding of this degeneracy is of vital importance if $\\theta_{23}$\nis close to maximal mixing. The relative importance between the appearance and\ndisappearance channels depends upon the particular setup and how close to\nmaximal mixing Nature has chosen the value for $\\theta_{23}$. For facilities\nthat operate with a narrow band beam or a wide band beam centered on the first\noscillation extremum, the contribution of the disappearance channel depends\ncritically on the systematic uncertainties assumed for this channel. Whereas\nfor facilities that operate at energies above the first oscillation extremum or\nat the second oscillation extremum the appearance channels dominate. On the\nother hand, for $\\delta$ we find that the disappearance channel usually\nimproves the sensitivity, modestly for facilities around the first oscillation\nextremum and more significantly for facilities operating at an energy above the\nfirst oscillation extremum, especially near $\\delta \\sim \\pm \\pi/2$.", "positive": "Angular Momentum Mixing in a Non-spherical Color Superconductor: We study the angular momentum mixing effects in the color superconductor with\nnon-spherical pairing. We first clarify the concept of the angular momentum\nmixing with a toy model for non-relativistic and spinless fermions. Then we\nderive the gap equation for the polar phase of dense QCD by minimizing the CJT\nfree energy. The solution of the gap equation consists of all angular momentum\npartial waves of odd parity. The corresponding free energy is found to be lower\nthan that reported in the literature with p-wave only." }, { "anchor": "The Theory of Deeply Inelastic Scattering: The nucleon structure functions probed in deep-inelastic scattering at large\nvirtualities form an important tool to test Quantum Chromdynamics (QCD) through\nprecision measurements of the strong coupling constant $\\alpha_s(M_Z^2)$ and\nthe different parton distribution functions. The exact knowledge of these\nquantities is also of importance for all precision measurements at hadron\ncolliders. During the last two decades very significant progress has been made\nin performing precision calculations. We review the theoretical status reached\nfor both unpolarized and polarized lepton-hadron scattering based on\nperturbative QCD.", "positive": "Color Transparency or the Standard Inelastic Shadowing?: The standard first-order inelastic correction (IC) well known in the pre-QCD\nera, causes a rising $Q^2$-dependence of nuclear transparency in the\nquasielastic electron scattering, $A(e,e'p)A'$, at moderate $Q^2$, similar to\nwhat is supposed to be the onset of color transparency (CT). Although IC is a\npart of the whole pattern of CT, it contains no explicit QCD dynamics.\nEvaluation of this correction is based on experimental data on diffraction\ndissociation and is independent of whether CP phenomenon exists or not. The\ngrowth of nuclear transparency is numerically comparable with the expected\nsignal of CT up to about $Q^2\\approx 20\\ GeV^2$. Analogous effect in\n$A(p,2p)A'$ reaction is estimated as well." }, { "anchor": "Pentaquarks and Radially Excited Baryons: In this talk I report on a computation of the spectra of exotic pentaquarks\nand radial excitations of the low--lying ${1/2}^+$ and ${3/2}^+$ baryons in a\nchiral soliton model.", "positive": "On sub-GeV Dark Matter Production at Fixed-Target Experiments: We analyze the sensitivity of fixed-target experiments to sub-GeV thermal\nrelic dark matter models, accounting for variations in both mediator and dark\nmatter mass, and including dark matter production through both on- and\noff-shell mediators. It is commonly thought that the sensitivity of such\nexperiments is predicated on the existence of an on-shell mediator that is\nproduced and then decays to dark matter. While accelerators do provide a unique\nopportunity to probe the mediator directly, our analysis demonstrates that\ntheir sensitivity extends beyond this commonly discussed regime. In particular,\nwe provide sensitivity calculations that extend into both the effective field\ntheory regime where the mediator is much heavier than the dark matter and the\nregime of an off-shell mediator lighter than a dark matter\nparticle-antiparticle pair. Our calculations also elucidate the resonance\nregime, making it clear that all but a fine-tuned region of thermal freeze-out\nparameter space for a range of simple models is well covered." }, { "anchor": "Flavored Gauge-Mediation: The messengers of Gauge-Mediation Models can couple to standard-model matter\nfields through renormalizable superpotential couplings. These matter-messenger\ncouplings generate generation-dependent sfermion masses and are therefore\nusually forbidden by discrete symmetries. However, the non-trivial structure of\nthe standard-model Yukawa couplings hints at some underlying flavor theory,\nwhich would necessarily control the sizes of the matter-messenger couplings as\nwell. Thus for example, if the doublet messenger and the Higgs have the same\nproperties under the flavor theory, the resulting messenger-lepton couplings\nare parametrically of the same order as the lepton Yukawas, so that slepton\nmass-splittings are similar to those of minimally-flavor-violating models and\ntherefore satisfy bounds on flavor-violation, with, however, slepton mixings\nthat are potentially large. Assuming that fermion masses are explained by a\nflavor symmetry, we construct viable and natural models with messenger-lepton\ncouplings controlled by the flavor symmetry. The resulting slepton spectra are\nunusual and interesting, with slepton mass-splittings and mixings that may be\nprobed at the LHC. In particular, since the new contributions are typically\nnegative, and since they are often larger for the first- and second-generation\nsleptons, some of these examples have the selectron or the smuon as the\nlightest slepton, with mass splittings of a few to tens of GeV.", "positive": "The Horizontal Symmetry for Neutrino Mixing: We argue that the best way to determine horizontal symmetry is from neutrino\nmixing, and proceed to show that the only finite group capable of yielding the\ntri-bimaximal mixing for all Yukawa couplings is $S_4$, or any group containing\nit. The method used is largely group theoretical, but it can be implemented by\ndynamical schemes in which the Higgs expectation values introduced to break\n$S_4$ spontaneously are uniquely determined up to an unknown scale for each." }, { "anchor": "Soft gluon evolution and non-global logarithms: We consider soft-gluon evolution at the amplitude level. Our evolution\nincludes Coulomb exchanges and applies to generic hard-scattering processes\ninvolving any number of coloured partons. We emphasise the special role played\nby a Lorentz-invariant evolution variable, which coincides with the transverse\nmomentum of the latest emission in a suitably defined dipole zero-momentum\nframe. We also relate the evolution algorithm, which was used originally in the\nderivation of super-leading logarithms, to renormalization group evolution\nequations that have been encountered recently. Handling large colour matrices\npresents the most significant challenge to numerical implementations and we\npresent a means to expand systematically about the leading colour\napproximation.", "positive": "A New Method for Analysing Dark Matter Direct Detection Data: The experimental situation of Dark Matter Direct Detection has reached an\nexciting cross-roads, with potential hints of a discovery of Dark Matter (DM)\nfrom the CDMS, CoGeNT, CRESST-II and DAMA experiments in tension with\nnull-results from xenon-based experiments such as XENON100 and LUX. Given the\npresent controversial experimental status, it is important that the analytical\nmethod used to search for DM in Direct Detection experiments is both robust and\nflexible enough to deal with data for which the distinction between signal and\nbackground points is difficult, and hence where the choice between setting a\nlimit or defining a discovery region is debatable. In this article we propose a\nnovel (Bayesian) analytical method, which can be applied to all Direct\nDetection experiments and which extracts the maximum amount of information from\nthe data. We apply our method to the XENON100 experiment data as a worked\nexample, and show that firstly our exclusion limit at 90% confidence is in\nagreement with their own for the 225 Live Days data, but is several times\nstronger for the 100 Live Days data. Secondly we find that, due to the two\npoints at low values of S1 and S2 in the 225 days data-set, our analysis points\nto either weak consistency with low-mass Dark Matter or the possible presence\nof an unknown background. Given the null-result from LUX, the latter scenario\nseems the more plausible." }, { "anchor": "Integrand reduction of one-loop scattering amplitudes through Laurent\n series expansion: We present a semi-analytic method for the integrand reduction of one-loop\namplitudes, based on the systematic application of the Laurent expansions to\nthe integrand-decomposition. In the asymptotic limit, the coefficients of the\nmaster integrals are the solutions of a diagonal system of equations, properly\ncorrected by counterterms whose parametric form is konwn a priori. The Laurent\nexpansion of the integrand is implemented through polynomial division. The\nextension of the integrand-reduction to the case of numerators with rank larger\nthan the number of propagators is discussed as well.", "positive": "Longitudinal structure function from the parton parameterization: We present a set of formulas to extract the longitudinal structure function\nfrom the proton structure function and its derivatives with respect to lnQ2 in\nthe next-to-next-to-leading order of the perturbative theory at low x based on\na hard poemron exchange. The behavior of the DIS cross section ratio R(x;Q2)\nand the ratio FL(x;Q2)=F2(x;Q2) studied and compared with the experimental\ndata, also these behaviors controlled by the color dipole model bound. These\nresults show a good agreement with the DIS experimental data throughout the low\nvalues of x. These results within the next-to-next-to-leading order\napproximation at very low x can be applied in the LHeC region for analyses of\nultra-high energy processes." }, { "anchor": "The proton charge radius: Nucleons (protons and neutrons) are the building blocks of atomic nuclei, and\nare responsible for more than 99\\% of the visible matter in the universe.\nDespite decades of efforts in studying its internal structure, there are still\na number of puzzles surrounding the proton such as its spin, and charge radius.\nAccurate knowledge about the proton charge radius is not only essential for\nunderstanding how quantum chromodynamics (QCD) works in the non-perturbative\nregion, but also important for bound state quantum electrodynamics (QED)\ncalculations of atomic energy levels. It also has an impact on the Rydberg\nconstant, one of the most precisely measured fundamental constants in nature.\nThis article reviews the latest situation concerning the proton charge radius\nin light of the new experimental results from both atomic hydrogen spectroscopy\nand electron scattering measurements, with particular focus on the latter. We\nalso present the related theoretical developments and backgrounds concerning\nthe determination of the proton charge radius using different experimental\ntechniques. We discuss upcoming experiments, and briefly mention the deuteron\ncharge radius puzzle at the end.", "positive": "Unification of Gauge Couplings in the E(6)SSM: We argue that in the two-loop approximation gauge coupling unification in the\nexceptional supersymmetric standard model can be achieved for any\nphenomenologically reasonable value of strong gauge coupling at the electroweak\nscale consistent with the experimentally measured central value." }, { "anchor": "Buckets of Higgs and Tops: We show that associated production of a Higgs with a top pair can be observed\nin purely hadronic decays. Reconstructing the top quarks in the form of jet\nbuckets allows us to control QCD backgrounds as well as signal combinatorics.\nThe background can be measured from side bands in the reconstructed Higgs mass.\nWe back up our claims with a detailed study of the QCD event simulation, both\nfor the signal and for the backgrounds.", "positive": "DVCS on the nucleon to the twist-3 accuracy: The amplitude of the deeply virtual Compton scattering off nucleon is\ncomputed to the twist-3 accuracy in the Wandzura-Wilczek (WW) approximation.\nThe result is presented in the form which can be easily used for the analysis\nof DVCS observables." }, { "anchor": "A QFT-induced phase in neutrino flavour oscillations: In the extended Standard Model of particle physics, each neutrino mass\neigenstate is predicted to have a tiny but non vanishing magnetic moment\ninduced by quantum field theoretic corrections. These QFT-induced magnetic\nmomenta depend linearly on masses of the underlying mass eigenstates with a\nproportionality constant ${3eG_{F}}/{(8\\sqrt{2}\\pi^{2})} $. As a consequence\nwhen neutrinos are embedded in an environment containing magnetic fields the\nflavour oscillations get a contribution from the induced relative phases.", "positive": "Novel approaches in Hadron Spectroscopy: The last two decades have witnessed the discovery of a myriad of new and\nunexpected hadrons. The future holds more surprises for us, thanks to\nnew-generation experiments. Understanding the signals and determining the\nproperties of the states requires a parallel theoretical effort. To make full\nuse of available and forthcoming data, a careful amplitude modeling is\nrequired, together with a sound treatment of the statistical uncertainties, and\na systematic survey of the model dependencies. We review the contributions made\nby the Joint Physics Analysis Center to the field of hadron spectroscopy." }, { "anchor": "Symmetry structure and phase transitions: We study chiral symmetry structure at finite density and temperature in the\npresence of external magnetic field and gravity, a situation relevant in the\nearly Universe and in the core of compact stars.\n We then investigate the dynamical evolution of phase transition in the\nexpanding early Universe and possible formation of quark nuggets and their\nsurvival.", "positive": "Determination of the QCD Coupling from ALEPH $\u03c4$ Decay Data: We present a comprehensive study of the determination of the strong coupling\nfrom $\\tau$ decay, using the most recent release of the experimental ALEPH\ndata. We critically review all theoretical strategies used in previous works\nand put forward various novel approaches which allow to study complementary\naspects of the problem. We investigate the advantages and disadvantages of the\ndifferent methods, trying to uncover their potential hidden weaknesses and test\nthe stability of the obtained results under slight variations of the assumed\ninputs. We perform several determinations, using different methodologies, and\nfind a very consistent set of results. All determinations are in excellent\nagreement, and allow us to extract a very reliable value for\n$\\alpha_s(m_\\tau^2)$. The main uncertainty originates in the pure perturbative\nerror from unknown higher orders. Taking into account the systematic\ndifferences between the results obtained with the CIPT and FOPT prescriptions,\nwe find $\\alpha_{s}^{(n_f=3)}(m_\\tau^2) = 0.328 \\pm 0.013$ which implies\n$\\alpha_{s}^{(n_f=5)}(M_Z^{2}) = 0.1197\\pm 0.0015$." }, { "anchor": "Probing Non-leptonic Two-body Decays of $B_c$ meson: Rates and CP asymmetries of the non-leptonic two-body decay of $B_c$ are\ncalculated based on the low energy effective Hamiltonian. We concentrate on\nsuch $b$ quark decays of the processes with $0^-$ and $1^-$ S-wave particles\nand/or $0^+$ and $1^+$ P-wave particles in the final states. The Salpeter\nmethod, which is the relativistic instantaneous approximation of the original\nBethe-Salpeter equation, is used to derive hadron transition matrix elements.\nBased on the calculation, it is found that the best decay channels to observe\nCP violation are $B_c^-\\rightarrow \\eta_c +D^-(D^{*-}_0)$, which need about\n$\\sim10^7$ $B_c$ events in experiment. Decays to $ \\eta_c +D^{*-}(D_s^-),\nh_c+D^-(D^{*-})(D^{*-}_0), J/\\Psi+D^{*-}$ are also hopeful channels.", "positive": "Proceedings of the 2014 Asia-Europe-Pacific School of High-Energy\n Physics: The Asia-Europe-Pacific School of High-Energy Physics is intended to give\nyoung physicists an introduction to the theoretical aspects of recent advances\nin elementary particle physics. These proceedings contain lecture notes on\nquantum field theory and the electroweak Standard Model, the theory of quantum\nchromodynamics, flavour physics and CP violation, neutrino physics, heavy-ion\nphysics, cosmology and a brief introduction to the principles of\ninstrumentation and detectors for particle physics." }, { "anchor": "Gauge Dependence of the High-Temperature 2-Loop Effective Potential for\n the Higgs Field: The high-temperature limit of the 2-loop effective potential for the Higgs\nfield is calculated from an effective 3d theory, in a general covariant gauge.\nIt is shown explicitly that a gauge-independent result can be extracted for the\nequation of state from the gauge-dependent effective potential. The convergence\nof perturbation theory is estimated in the broken phase, utilizing the gauge\ndependence of the effective potential.", "positive": "Tevatron-for-LHC Report: Top and Electroweak Physics: The top quark and electroweak bosons (W and Z) represent the most massive\nfundamental particles yet discovered, and as such refer directly to the\nStandard Model's greatest remaining mystery: the mechanism by which all\nparticles gained mass. This report summarizes the work done within the top-ew\ngroup of the Tevatron-for-LHC workshop. It represents a collection of both\nTevatron results, and LHC predictions. The hope is that by considering and\ncomparing both machines, the LHC program can be improved and aided by knowledge\nfrom the Tevatron, and that particle physics as a whole can be enriched. The\nreport includes measurements of the top quark mass, searches for single top\nquark production, and physics of the electroweak bosons at hadron colliders." }, { "anchor": "Skewness Dependence of GPD / DVCS, Conformal OPE and AdS/CFT\n Correspondence II: a holographic model of GPD: Traditional idea of Pomeron/Reggeon description for hadron scattering is now\nbeing given theoretical foundation in gravity dual descriptions, where Pomeron\ncorresponds to exchange of spin-$j \\in 2\\mathbb{Z}$ states in the graviton\ntrajectory. Deeply virtual Compton scattering (DVCS) is essentially a 2 to 2\nscattering process of a hadron and a photon, and hence one should be able to\nstudy non-perturbative aspects (GPD) of this process by the Pomeron/Reggeon\nprocess in gravity dual. We find, however, that even one of the most developed\nformulations of gravity dual Pomeron (Brower--Polchinski--Strassler--Tan (BPST)\n2006) is not able to capture skewness dependence of GPD properly. In Part I\n(arXiv:1212.3322), therefore, we computed Reggeon wavefunctions on AdS$_5$ so\nthat the formalism of BPST can be generalized. In this article, Part II, we use\nthe wavefunctions to determine the DVCS amplitude, bring it to the form of\nconformal OPE/collinear factorization, and extract a holographic model of GPD,\nwhich naturally fits into the framework known as \"dual parametrization\" or\n\"(conformal) collinear factorization approach\".", "positive": "Light Charged and CP-odd Higgses in MSSM-like Models: We study the Higgs sector of supersymmetric models containing two Higgs\ndoublets with a light MSSM-like CP odd Higgs, $m_A \\lesssim 10$ GeV, and $\\tan\n\\beta \\lesssim 2.5$. In this scenario all Higgses resulting from two Higgs\ndoublets: light and heavy CP even Higgses, $h$ and $H$, the CP odd Higgs, $A$,\nand the charged Higgs, $H^\\pm$, could have been produced at LEP or the\nTevatron, but would have escaped detection because they decay in modes that\nhave not been searched for or the experiments are not sensitive to. Especially\n$H \\to ZA$ and $H^\\pm \\to W^{\\pm \\star} A$ with $A \\to c \\bar c, \\tau^+ \\tau^-$\npresent an opportunity to discover some of the Higgses at LEP, the Tevatron and\nalso at B factories. In addition, the $2.8 \\sigma$ excess of the branching\nratio $W \\to \\tau \\nu$ with respect to the other leptons measured at LEP\ncorrelates well with the existence of the charged Higgs with properties typical\nfor this scenario. Dominant $\\tau$- and $c$-rich decay products of all Higgses\nrequire modified strategies for their discovery at the LHC." }, { "anchor": "Non-Zero $\u03b8_{13}$ and $\u03b4_{CP}$ in a Neutrino Mass Model with\n $A_4$ Symmetry: In this paper, we consider a neutrino mass model based on $A_4$ symmetry. The\nspontaneous symmetry breaking in this model is chosen to obtain tribimaximal\nmixing in the neutrino sector. We introduce $Z_2 \\times Z_2$ invariant\nperturbations in this model which can give rise to acceptable values of\n$\\theta_{13}$ and $\\delta_{CP}$. Perturbation in the charged lepton sector\nalone can lead to viable values of $\\theta_{13}$, but cannot generate\n$\\delta_{CP}$. Perturbation in the neutrino sector alone can lead to acceptable\n$\\theta_{13}$ and maximal CP violation. By adjusting the magnitudes of\nperturbations in both sectors, it is possible to obtain any value of\n$\\delta_{CP}$.", "positive": "Isospectral Potentials and Quarkonia Low Energy Spectra: A Possibility\n of simultaneous fit to Masses and leptonic decay widths\": Some of the non-relativistic QQ/bar interaction potentials and its\nisospectral partner-potentials have been employed to evaluate the masses and\nleptonic decay widths of Charmonium and Upsilon states. An attempt has been\nmade to develop a prescription to provide a simultaneous fit to Masses and\nleptonic decay widths of Quarkonia. Preliminary calculation shows that the\nclass of isospectral-potentials corresponding to: V(r)= -(alphas/r)+ar^n\nappears to yield the desired results. The various associated theoretical and\nphenomenological issues are discussed in light of recent data. The possible\nrelation with the 'Wrinkled potentials' is also discussed." }, { "anchor": "Evaluation of a Class of Two-Scale Three-Loop Vacuum Diagrams: As a generalization of a previous work [Phys. Rev. D. {\\bf 59}, 105014\n(1999)], we compute analytically a class of three-loop vacuum diagrams with two\n{\\em arbitrarily} different mass scales. We use a decomposition algorithm in\nwhich the integrand of the final integral for the third momentum vector, say,\n$k$, becomes independent of the angles of $k$-vector in spherical polar\ncoordinates. This algorithm proves to be very efficient in obtaining\nexclusively all $\\e$-pole terms of the given diagram.", "positive": "Nuclear PDFs from the LHeC perspective: We study the prospects for constraining the nuclear parton distribution\nfunctions by small-x deep inelastic scattering. Performing a global fit of\nnuclear parton distribution functions including a sample of pseudodata\nrepresenting expected measurements at the planned LHeC collider, we demonstrate\nthat the accuracy of the present nuclear parton distributions could be be\nimproved substantially. We also discuss the impact of flavour-tagged data." }, { "anchor": "Calculation of the R-ratio of $e^{+}e^{-}\\to$ hadrons at the higher-loop\n levels: The calculation of the R-ratio of electron-positron annihilation into hadrons\nis discussed. The method, which enables one to properly account for all the\neffects due to continuation of the spacelike perturbative results into the\ntimelike domain at an arbitrary loop level, is delineated.", "positive": "Higgs look-alikes at the LHC: The discovery of a Higgs particle is possible in a variety of search channels\nat the LHC. However the true identity of any putative Higgs boson will at first\nremain ambiguous, until one has experimentally excluded other possible\nassignments of quantum numbers and couplings. We quantify to what degree one\ncan discriminate a Standard Model Higgs boson from \"look-alikes\" at, or close\nto, the moment of discovery at the LHC. We focus on the fully-reconstructible\n\"golden\" decay mode to a pair of Z bosons and a four-lepton final state,\nsimulating sPlot-weighted samples of signal and background events. Considering\nboth on-shell and off-shell Z's, we show how to utilize the full decay\ninformation from the events, including the distributions and correlations of\nthe five relevant angular variables. We demonstrate how the finite phase space\nacceptance of any LHC detector sculpts the decay distributions, a feature\nneglected in previous studies. We use likelihood ratios to discriminate a\nStandard Model Higgs from look-alikes with other spins or nonstandard parity,\nCP, or form factors. For a benchmark resonance mass of 200 GeV/c^2, we achieve\na median expected discrimination significance of 3 sigma with as few as 19\nevents, and even better discrimination for the off-shell decays of a 145\nGeV/c^2 resonance." }, { "anchor": "BRANECODE: A Program for Simulations of Braneworld Dynamics: We describe an algorithm and a C++ implementation that we have written and\nmade available for calculating the fully nonlinear evolution of 5D braneworld\nmodels with scalar fields. Bulk fields allow for the stabilization of the extra\nspace. However, they complicate the dynamics of the system, so that analytic\ncalculations (performed within an effective 4D theory) are typically only\nreliable close to stabilized configurations or when the evolution of the extra\nspace is negligible. In the general case, a numerical study of the 5D equations\nis necessary, and the algorithm and code we describe are the first ones\ndesigned for this task. The program and its full documentation are available on\nthe Web at http://www.cita.utoronto.ca/~jmartin/BRANECODE/. In this paper we\nprovide a brief overview of what the program does and how to use it.", "positive": "Inclusive radiative decays of charmonium: We discuss the theoretical status of inclusive radiative decays of\ncharmonium, with a particular emphasis on the QCD description of the photon\nspectrum, where progress has occurred in recent years. We also comment on the\npossible extraction of alpha_s (M_J/psi) and on the possibility to gain\nimportant information on the nature of J/psi and psi (2S)." }, { "anchor": "The number density of a charged relic: We investigate scenarios in which a charged, long-lived scalar particle\ndecouples from the primordial plasma in the Early Universe. We compute the\nnumber density at time of freeze-out considering both the cases of abelian and\nnon-abelian interactions and including the effect of Sommerfeld enhancement at\nlow initial velocity. We also discuss as extreme case the maximal cross section\nthat fulfils the unitarity bound. We then compare these number densities to the\nexotic nuclei searches for stable relics and to the BBN bounds on unstable\nrelics and draw conclusions for the cases of a stau or stop NLSP in\nsupersymmetric models with a gravitino or axino LSP.", "positive": "Exploring meson correlators in the model with four-quark interaction\n Lagrangian: Meson correlation functions are studied in the model with four-fermion\ninteraction Lagrangian. We demonstrate that despite the singular character of\nsystem mean energy and corresponding quark condensate found out the meson\nobservables are finite, quite well identified and compatible with experimental\nenergy scale. It allows one to use the similar model Hamiltonians for\ndescribing the nonequilibrium features of quark/hadron systems which reveal\nthemselves in studying ultrarelativistic heavy ion collisions. The analytical\nresults for meson correlation functions in the Keldysh model are given." }, { "anchor": "Inhomogeneous charged pion condensation in chiral asymmetric dense quark\n matter in the framework of NJL$_2$ model: In this paper we investigate the phase structure of a (1+1)-dimensional quark\nmodel with four-quark interaction and in the presence of baryon ($\\mu_B$),\nisospin ($\\mu_I$) and chiral isospin ($\\mu_{I5}$) chemical potentials.\nSpatially inhomogeneous chiral density wave (for chiral condensate) and single\nwave (for charged pion condensate) approaches are used. It is established that\nin the large-$N_c$ limit ($N_c$ is the number of colored quarks) there exists a\nduality correspondence between the chiral symmetry breaking phase and the\ncharged pion condensation (PC) one. Moreover, it is shown that inhomogeneous\ncharged PC phase with nonzero baryon density is induced in the model by\narbitrary small values of the chemical potential $\\mu_{I5}$ (for a rather large\nregion of $\\mu_B$ and $\\mu_I$).", "positive": "Non-unitarity effects in the minimal inverse seesaw model: A minimal version of the inverse seesaw model featuring only two pairs of\nTeV-scale singlet neutrinos is discussed from the perspective of non-standard\nneutrino interactions. A particular attention is paid to the non-standard\npatterns of flavour and CP violation emerging due to the possibly enhanced\nnon-decoupling effects of the heavy sector and the associated non-unitarity of\nthe effective lepton mixing matrix." }, { "anchor": "Unparticle Decay of Neutrinos and its Possible Signatures at a ${\\rm\n Km}^2$ Detector for (3+1) Flavour Framework: We consider a scenario where ultra high energy neutrinos undergo unparticle\ndecay during its passage from its cosmological source to Earth. The idea of\nunparticle had been first proposed by Georgi by considering the possible\nexistence of an unknown scale invariant sector at high energies and the\nunparticles in this sector manifest itself below a dimensional transmutation\nscale $\\Lambda_{\\cal U}$. We then explore the possible signature of such\ndecaying neutrinos to unparticles at a square kilometer detector such as\nIceCube.", "positive": "New $I=J$ Rules for the Baryon Vertices in $1/N_c$ Expansion: We apply the $1/N_c$ expansion in QCD to the baryon vertices. We find new\nmodel independent properties for the isoscalar and isovector baryon vertices\nfrom the view point of $1/N_c$ expansion in QCD. One of these results, $I=J$\nrule, have been already found. The other properties, new $I=J$ rules, are the\nrules about the isospin and strangeness dependence for the baryon vertices." }, { "anchor": "Phenomenological aspects of CP violation: We present a pedagogical review of the phenomenology of CP violation, with\nemphasis on B decays. Main topics include the phenomenology of neutral meson\nsystems, CP violation in the Standard Model of electroweak interactions, and B\ndecays. We stress the importance of the reciprocal basis, sign conventions,\nrephasing invariance, general definitions of the CP transformation and the\nspurious phases they bring about, CP violation as originating from the clash of\ntwo contributions, the rho-eta plane, the four phases of a generalized CKM\nmatrix, and the impact of discrete ambiguities. Specific B decays are included\nin order to illustrate some general techniques used in extracting information\nfrom B physics experiments. We include a series of simple exercises. The style\nis informal.", "positive": "An Attempt to Study Pentaquark Baryons in String Theory: An attempt to study recently observed Pentaquark baryons is performed in the\ndual string theory of QCD. Mass formulae for Pentaquark baryons are naively\nestimated in the Maldacena's prototype model for supersymmetric QCD and a more\nrealistic model for the ordinary QCD." }, { "anchor": "Electric Charge Quantization in Standard Model: In the framework of Standard Model for the arbitrary values of Higgs and\nfermions fields hypercharges, taking into account parity invariance of\nelectromagnetic interaction, expressions for the fermions charges, testifying\nthe electric charge quantization are obtained. From the chiral anomalies\ncancellation condition within one family of leptons and quarks, numerical\nvalues of fermions charges, coinciding with standard values of charges have\nbeen obtained.", "positive": "Potential NRQCD: an effective theory for heavy quarkonium: Within an effective field theory framework we study heavy-quark--antiquark\nsystems with a typical distance between the heavy quark and the antiquark\nsmaller than $1/\\Lambda_{\\rm QCD}$. A suitable definition of the potential is\ngiven within this framework, while non-potential (retardation) effects are\ntaken into account in a systematic way. We explore different physical systems.\nModel-independent results on the short distance behavior of the energies of the\ngluonic excitations between static quarks are obtained. Finally, we show how\ninfrared renormalons affecting the static potential get cancelled in the\neffective theory." }, { "anchor": "The leading jet transverse momentum in inclusive jet production and with\n a loose jet veto: We study the transverse momentum of the leading jet in the limit where the\njet radius is small, $R\\ll 1$. We introduce the leading-jet function to\ncalculate this cross section for an inclusive jet sample, and the\nsubleading-jet function when a loose veto on additional jets is imposed, i.e.\n$p_{T,J} \\gtrsim p_T^{\\rm veto}$. These jet functions are calculated at\nnext-to-leading order in QCD and the resummation of jet radius logarithms is\nexplored. We present phenomenological results for Higgs + 1 jet production, for\nboth the jet and Higgs transverse momentum distribution. We find that, while\nthe $R \\ll 1$ limit of the cross section provides a good description of the\nfull NLO result, even for values as large as $R=0.8$, simply retaining the\nleading logarithm at this order does not. Indeed, the NLO contribution to the\nhard function and, to a lesser extent, non-logarithmic corrections to the jet\nfunction are sizable and must be included to obtain the correct cross section.\nIn the inclusive cross section we find that the $\\alpha_s^2 \\ln^2R$ corrections\nare several precent, while in exclusive cross sections at large $p_{T,J}$ and\nsmall $R$ they can reach 20%. However, it is not clear how important the\nresummation of these logarithms is, given the presence of other large\ncorrections at NNLO.", "positive": "Neutrinoless Double $\u03b2$-Decay: The neutrinoless double $\\beta$-decay is reviewed. Model independent evidence\nin favor of neutrino masses and mixing is briefly summarized. The data of the\nrecent experiments on the search for $0\\nu\\beta\\beta$-decay are presented and\nsome future experiments are discussed. The possible values of the effective\nMajorana mass, which can be predicted on the basis of the neutrino oscillation\ndata under different assumptions on the pattern of the neutrino mass spectrum,\nare considered. A possible model independent test of the nuclear matrix element\ncalculations is discussed." }, { "anchor": "On the Extraction of Cross Sections for pi0 and eta Photoproduction off\n Neutrons from Deuteron Data: We discuss the procedure of extracting the photoproduction cross section for\nneutral pseudoscalar mesons off neutrons from deuteron data. The main statement\nis that the final-state interaction (FSI) corrections for the proton and\nneutron target are in general not equal, but for pi0 production there are\nspecial cases were they have to be identical and there are large regions in the\nparameter space of incident photon energy and pion polar angle, \\theta^*, where\nthey happen to be quite similar. The corrections for both target nucleons are\npractically identical for $\\pi_0$ production in the energy range of the\nDelta(1232)3/2+ resonance due to the specific isospin structure of this\nexcitation. Also above the $\\Delta$-isobar range large differences between\nproton and neutron correction factors are only predicted for extreme forward\nangles ($\\theta^*$ < 20 deg), but the results are similar for larger angles.\nNumerical results for the gp-->pi0p and gn-->pi0n correction factors are\ndiscussed. Also the model description for the available data on the\ndifferential gd-->pi0pn cross sections are given.", "positive": "First-Order Phase Transitions in an Early-Universe Environment: In first-order phase transitions in the early universe, the bubble wall is\nexpected to be significantly slowed-down by its interaction with the\nsurrounding plasma. We examine the behaviour of the phase of the Higgs field\nafter two-bubble collisions, and find that phase differences equilibrate much\nmore quickly in slow-moving bubbles than in those which expand at the speed of\nlight. This could lead to a significant reduction in the initial density of\ntopological defects formed at a first-order phase transition." }, { "anchor": "Automated calculation of matrix elements and physics motivated\n observables: The central aspect of my personal scientific activity, has focused on\ncalculations useful for interpretation of High Energy accelerator experimental\nresults, especially in a domain of precision tests of the Standard Model. My\nactivities started in early 80's, when computer support for algebraic\nmanipulations was in its infancy. But already then it was important for my\nwork. It brought a multitude of benefits, but at the price of some\ninconvenience for physics intuition. Calculations became more complex, work had\nto be distributed over teams of researchers and due to automatization, some\naspects of the intermediate results became more difficult to identify.\n In my talk I will not be very exhaustive, I will present examples from my\npersonal research only: (i) calculations of spin effects for the process e+ e-\nto tau+tau- gamma at Petra/PEP energies, calculations (with the help of the\n{\\tt Grace} system of Minami-tateya group) and phenomenology of spin amplitudes\nfor (ii) e+ e- to 4f and for (iii) e+ e- to nu_e bar nu_e gamma gamma\nprocesses, (iv) phenomenology of CP-sensitive observables for Higgs boson\nparity in H to tau+ tau- , tau+- to nu 2(3)pi cascade decays", "positive": "A natural mechanism for approximate Higgs alignment in the 2HDM: The 2HDM possesses a neutral scalar interaction eigenstate whose tree-level\nproperties coincide with the Standard Model (SM) Higgs boson. In light of the\nLHC Higgs data which suggests that the observed Higgs boson is SM-like, it\nfollows that the mixing of the SM Higgs interaction eigenstate with the other\nneutral scalar interaction eigenstates of the 2HDM should be suppressed,\ncorresponding to the so-called Higgs alignment limit. The exact Higgs alignment\nlimit can arise naturally due to a global symmetry of the scalar potential. If\nthis symmetry is softly broken, then the Higgs alignment limit becomes\napproximate (although still potentially consistent with the current LHC Higgs\ndata). In this paper, we obtain the approximate Higgs alignment suggested by\nthe LHC Higgs data as a consequence of a softly broken global symmetry of the\nHiggs Lagrangian. However, this can only be accomplished if the Yukawa sector\nof the theory is extended. We propose an extended 2HDM with vector-like top\nquark partners, where explicit mass terms in the top sector provide the source\nof the soft symmetry breaking of a generalized CP symmetry. In this way, we can\nrealize approximate Higgs alignment without a significant fine-tuning of the\nmodel parameters. We then explore the implications of the current LHC bounds on\nvector-like top quark partners for the success of our proposed scenario." }, { "anchor": "Mass bounds of the lightest CP-even Higgs boson in the two-Higgs-doublet\n model: The upper and the lower bounds of the lightest CP-even Higgs-boson mass\n($m_h$) are discussed in the two-Higgs-doublet model (2HDM) with a\nsoftly-broken discrete symmetry. They are obtained as a function of a cut-off\nscale $\\Lambda$ ($\\leq 10^{19}$ GeV) by imposing the conditions in which the\nrunning coupling constants neither blow up nor fall down below $\\Lambda$. In\ncomparison with the standard model (SM), although the upper bound does not\nchange very much, the lower bound is considerably reduced. In the decoupling\nregime where only one Higgs boson ($h$) becomes much lighter than the others,\nthe lower bound is given, for example, by about 100 GeV for $\\Lambda = 10^{19}$\nGeV and $m_t = 175$ GeV, which is smaller by about 40 GeV than the\ncorresponding lower bound in the SM. In generic cases, $m_h$ is no longer\nbounded from below by these conditions. If we consider the $b \\to s \\gamma$\nconstraint, small values of $m_h$ are excluded in Model II of the 2HDM.", "positive": "Disentangling Higgs-Top Couplings in Associated Production: In the presence of CP violation, the Higgs-top coupling may have both scalar\nand pseudoscalar components, $\\kappa_t$ and ${\\tilde \\kappa_t}$, which are\nbounded indirectly but only weakly by the present experimental constraints on\nthe Higgs-gluon-gluon and Higgs-$\\gamma$-$\\gamma$ couplings, whereas upper\nlimits on electric dipole moments provide strong additional indirect\nconstraints on ${\\tilde \\kappa_t}$, if the Higgs-electron coupling is similar\nto that in the Standard Model and there are no cancellations with other\ncontributions. We discuss methods to measure directly the scalar and\npseudoscalar Higgs-top couplings by measurements of Higgs production in\nassociation with ${\\bar t} t$, single $t$ and single ${\\bar t}$ at the LHC.\nMeasurements of the total cross sections are very sensitive to variations in\nthe Higgs-top couplings that are consistent with the present indirect\nconstraints, as are invariant mass distributions in ${\\bar t} t H$, $tH$ and\n${\\bar t} H$ final states. We also investigate the additional information on\n$\\kappa_t$ and ${\\tilde \\kappa_t}$ that could be obtained from measurements of\nthe longitudinal and transverse $t$ polarization in the different associated\nproduction channels, and the ${\\bar t} t$ spin correlation in ${\\bar t} t H$\nevents." }, { "anchor": "Particle Ratios within a statistically corrected hadron resonance gas\n model and EPOS event-generator at AGS, SPS, RHIC and LHC Energies: We pursue the investigation of the validity of our recently proposed quantum\nmechanically correlated statistical hadron gas model (HRG) inspired by a\nBeth-Uhlenbeck corrected form of the equation of state (EoS) to the ideal\nhadron resonance gas model (IHRG). We calculate the ratios of some particle\nyields of equal masses, namely ($\\bar{p} / p$,$K^-/ K^+$, $\\pi^-/ \\pi^+$,\n$\\bar{\\Lambda}/ \\Lambda$, $\\bar{\\Sigma}/ \\Sigma$, $\\bar{\\Omega}/ \\Omega$), and\nsome particle yield with unequal masses, namely ($p/ \\pi^+$, $k^+/ \\pi^+$,\n$k^-/ \\pi^-$, $\\Lambda/ \\pi^-$, $\\bar{p}/ \\pi^-$, $\\Omega/\\pi^-$). We then\nstudy the center-of-mass energy variation of these ratios of particle yields\nobtained by our proposed HRG model. Our model results are then confronted with\nthe corresponding calculations obtained using the ideal hadron resonance gas\n(IHRG) model, the Cosmic Ray Monte Carlo (CRMC) EPOS $1.99$ simulations, as\nwell as the experimental data from AGS, SPS, RHIC, and ALICE. Our proposed HRG\nmodel results generally show very close agreement with the experimental data\ncompared with the other models considered. Especially remarkable is the very\ngood matching obtained by our new HRG model with the experimental data of\n$\\bar{p}/ \\pi^-$ and $p/ \\pi^+$, which suggests that our HRG model might be\nhelpful in describing the famous proton anomaly at top RHIC and LHC energies.\nHowever, some experimental data of the ratios of hadron pairs of unequal mass\nand (multi)strange content, like $\\Lambda/ \\pi^-$ and $\\Omega/ \\pi^-$, appear\nto be quite underestimated by both our HRG model and the IHRG model, which\nalert further investigation of the suitability of the thermal hadron gas\nmodel(s) and thereby motivate the need for further modification.", "positive": "Why should we care about the top quark Yukawa coupling?: In the cosmological context, for the Standard Model to be valid up to the\nscale of inflation, the top quark Yukawa coupling $y_t$ should not exceed the\ncritical value $y_t^{crit}$, coinciding with good precision (about 0.02%) with\nthe requirement of the stability of the electroweak vacuum. So, the exact\nmeasurements of $y_t$ may give an insight on the possible existence and the\nenergy scale of new physics above 100 GeV, which is extremely sensitive to\n$y_t$. We overview the most recent theoretical computations of $y_t^{crit}$ and\nthe experimental measurements of $y_t$. Within the theoretical and experimental\nuncertainties in $y_t$ the required scale of new physics varies from $10^7$ GeV\nto the Planck scale, urging for precise determination of the top quark Yukawa\ncoupling." }, { "anchor": "Higgs boson decay rate into gluons in a 5 dimensional calculable model: In an extension of the Standard Model with one compact extra dimension and\nN=1 supersymmetry, we compute the Higgs boson decay rate into two gluons,\nrelevant to the Higgs production in hadronic collisions. We find that at one\nloop the decay width is significantly suppressed with respect to the SM. In\nparticular, for a compactification radius 1/R=370 /pm 70 GeV and a Higgs mass\nm_H = 127 /pm 8 GeV we find it to be less than 15% of the SM result.", "positive": "Logarithmic EW corrections at one-loop: We present a fully automated implementation of next-to-leading order\nelectroweak (NLO EW) corrections in the logarithmic approximation in OpenLoops.\nFor energies above the electroweak scale NLO EW corrections are logarithmically\nenhanced and in tails of kinematic distributions of crucial LHC processes yield\ncorrection factors of several tens of percent. The implementation of the\nlogarithmic Sudakov EW approximation in the amplitude generator OpenLoops is\nfully general, largely model independent, it supports the computation of EW\ncorrections to resonant processes, and it is suitable for extensions to the\ntwo-loop NNLO EW level. The implementation is based on an efficient\nrepresentation of the logarithmic approximation in terms of an effective vertex\napproach. Investigating a set of representative LHC processes we find excellent\nagreement between the logarithmic approximation and full one-loop results in\nobservables where the assumptions of the EW Sudakov approximation are\nfulfilled." }, { "anchor": "Searching for lepton flavor violating decays tau to Pl in Minimal\n R-symmetric Supersymmetric Standard Model: We analyze the lepton flavor violating decays $\\tau\\rightarrow Pl$\n($P=\\pi,\\eta,\\eta';\\;l=e,\\mu$) in the scenario of the minimal R-symmetric\nsupersymmetric standard model. The prediction on the branching ratios\nBR$(\\tau\\rightarrow P e)$ and BR$(\\tau\\rightarrow P \\mu)$ is affected by the\nmass insertion parameters $\\delta^{13}$ and $\\delta^{23}$, respectively. These\nparameters are constrained by the experimental bounds on the branching ratios\nBR($\\tau\\rightarrow e (\\mu) \\gamma$) and BR($\\tau\\rightarrow 3e(\\mu)$). The\nresult shows $Z$ penguin dominates the prediction on BR($\\tau\\rightarrow Pl$)\nin a large region of the parameter space. The branching ratios for\nBR($\\tau\\rightarrow Pl$) are predicted to be, at least, five orders of\nmagnitude smaller than present experimental bounds and three orders of\nmagnitude smaller than future experimental sensitivities.", "positive": "First Order Quark-Gluon/Hadron Transition May Affect Cosmological\n Nucleosynthesis: In the model of a first order quark-gluon/hadron phase transition in which\nthe hadronic phase is considered as vacuum bubbles growing in the quark-gluon\nbackground with chiral symmetry broken inside the bubble, we find the estimate\nfor the length scale associated with inhomogeneities originated during the\ntransition, $10$ m $\\;\\stackrel{<}{\\sim }\\ell \\stackrel{<}{\\sim }40$ m, being\nsufficient to produce significant effects on cosmological nucleosynthesis." }, { "anchor": "Note on Thermalization of Non-resonantly Produced Sterile Neutrinos: Using an analytic treatment, we discuss the parameter regions of large\nactive-sterile neutrino mixing angles where sterile neutrinos produced in\nnon-resonant flavour oscillations can approach thermalization in several\ncosmologies. We show that thermalization affects only large active-sterile\nneutrino mixing already rejected by different limits. Hence, the allowed\nsterile neutrino parameter regions are unaffected.", "positive": "NLO exclusive diffractive processes with saturation: We present two NLO exclusive impact factors computed in the QCD shock wave\napproach. These are the very first steps towards precision studies of a wide\nrange of high energy exclusive processes with saturation effects in $ep$, $eA$,\n$pp$ and $pA$ collisions." }, { "anchor": "Renormalization group, trace anomaly and Feynman-Hellmann theorem: We show that the logarithmic derivative of the gauge coupling on the hadronic\nmass and the cosmological constant term of a gauge theory are related to the\ngluon condensate of the hadron and the vacuum respectively. These relations are\nakin to Feynman-Hellmann relations whose derivation for the case at hand are\ncomplicated by the construction of the gauge theory Hamiltonian. We bypass this\nproblem by using a renormalisation group equation for composite operators and\nthe trace anomaly. The relations serve as possible definitions of the gluon\ncondensates themselves which are plagued in direct approaches by power\ndivergences. In turn these results might help to determine the contribution of\nthe QCD phase transition to the cosmological constant and test speculative\nideas.", "positive": "Probing new physics through $B^*_s \\rightarrow \u03bc^+ \u03bc^-$ decay: We perform a model independent analysis of new physics in $B^*_s \\rightarrow\n\\mu^+ \\mu^-$ decay. We intend to identify new physics operator(s) which can\nprovide large enhancement in the branching ratio of $B^*_s \\rightarrow \\mu^+\n\\mu^-$ above its standard model prediction. For this, we consider new physics\nin the form of vector, axial-vector, scalar and pseudoscalar operators. We find\nthat scalar and pseudoscalar operators do not contribute to the branching ratio\nof $B^*_s \\rightarrow \\mu^+ \\mu^-$. We perform a global fit to all relevant $b\n\\to s \\mu^+ \\mu^-$ data for different new physics scenarios. For each of these\nscenarios, we predict $Br(B^*_s \\rightarrow \\mu^+ \\mu^-)$. We find that a\nsignificant enhancement in $Br(B^*_s \\rightarrow \\mu^+ \\mu^-)$ is not allowed\nby any of these new physics operators. In fact, for all new physics scenarios\nproviding a good fit to the data, the branching ratio of $B^*_s \\rightarrow\n\\mu^+ \\mu^-$ is suppressed as compared to the SM value. Hence the present $b\n\\to s \\mu^+ \\mu^-$ data indicates that the future measurements of $Br(B^*_s\n\\rightarrow \\mu^+ \\mu^-)$ is expected to be suppressed in comparison to the\nstandard model prediction." }, { "anchor": "Resonances $\u03c1(1450)^+$ and $\u03c1(1700)^+$ in $B \\to D KK$ decays: The contributions for the kaon pair from the intermediate states\n$\\rho(1450)^+$ and $\\rho(1700)^+$ in the decays $B^+ \\to \\bar{D}^0 K^+\n\\bar{K}^0$, $B^0 \\to D^- K^+ \\bar{K}^0$, and $B_s^0 \\to D_s^-K^+ \\bar{K}^0$ are\nanalyzed within the perturbative QCD factorization approach. The decay\namplitudes for all concerned decays in this work are dominated by the\nfactorizable Feynman diagrams with the emission of the kaon pair, and the\ncharged $\\rho$ mesons should be of great importance in the $KK$ channel of the\nrelated three-body $B$ decays. Moreover, these quasi-two-body decays are\nCKM-favored, and the relevant branching ratios are predicted to be in the order\nof $10^{-5}$, which have the potential to be measured by experiments. It is\nalso shown that the contributions of the subprocesses $\\rho(1450, 1700)^+ \\to\nKK$ for the three-body $B$ meson decays are considerable according to the total\nthree-body branching fractions presented by Belle. Therefore, the decays $B^+\n\\to \\bar{D}^0 K^+ \\bar{K}^0$, $B^0 \\to D^- K^+ \\bar{K}^0$, and $B_s^0 \\to\nD_s^-K^+ \\bar{K}^0$ can be employed to study the properties of $\\rho(1450)$ and\n$\\rho(1700)$ in the LHCb and Belle-II experiments.", "positive": "On refractive processes in strong laser field quantum electrodynamics: Refractive processes in strong-field QED are pure quantum processes, which\ninvolve only external photons and the background electromagnetic field. We show\nanalytically that such processes occurring in a plane-wave field and involving\nexternal real photons are all characterized by a surprisingly modest net\nexchange of energy and momentum with the laser field, corresponding to a few\nlaser photons, even in the limit of ultra-relativistic laser intensities. We\nobtain this result by a direct calculation of the transition matrix element of\nan arbitrary refractive QED process and accounting exactly for the background\nplane-wave field. A simple physical explanation of this modest net exchange of\nlaser photons is provided, based on the fact that the laser field couples with\nthe external photons only indirectly through virtual electron-positron pairs.\nFor stronger and stronger laser fields, the pairs cover a shorter and shorter\ndistance before they annihilate again, such that the laser can transfer to them\nan energy corresponding to only a few photons. These results can be relevant\nfor future experiments aiming to test strong-field QED at present and\nnext-generation facilities." }, { "anchor": "The Supersymmetric Georgi-Machacek Model: We show that the well known Georgi-Machacek (GM) model can be realized as a\nlimit of the recently constructed Supersymmetric Custodial Higgs Triplet Model\n(SCTM) which in general contains a significantly more complex scalar spectrum.\nWe dub this limit of the SCTM, which gives a weakly coupled origin for the GM\nmodel at the electroweak scale, the Supersymmetric GM (SGM) model. We derive a\nmapping between the SGM and GM models using it to show how a supersymmetric\norigin implies constraints on the Higgs potential in conventional GM model\nconstructions which would generically not be present. We then perform a\nsimplified phenomenological study of diphoton and ZZ signals for a pair of\nbenchmark scenarios to illustrate under what circumstances the GM model can\nmimic the SGM model and when they should be easily distinguishable.", "positive": "Combined Constraints on First Generation Leptoquarks: In this article we perform a combined analysis of low energy precision\nconstraints and LHC searches for leptoquarks which couple to first generation\nfermions. Considering all ten leptoquark representations, five scalar and five\nvector ones, we study at the precision frontier the constraints from\n$K\\to\\pi\\nu\\nu$, $K\\to\\pi e^+e^-$, $K^0-\\bar K^0$ and $D^0-\\bar D^0$ mixing, as\nwell as from experiments searching for parity violation (APV and QWEAK). We\ninclude LHC searches for $s$-channel single resonant production, pair\nproduction and Drell-Yan-like signatures of leptoquarks. Interestingly, we find\nthat the recent non-resonant di-lepton analysis of ATLAS provides stronger\nbounds than the resonant searches recasted so far to constrain $t$-channel\nproduction of leptoquarks. Taking into account all these bounds, we observe\nthat none of the leptoquark representations can address the so-called \"Cabibbo\nangle anomaly\" via a direct contribution to super-allowed beta decays." }, { "anchor": "Unbroken $SU(2)$ at a 100 TeV collider: A future 100 TeV pp collider will explore energies much higher than the scale\nof electroweak (EW) symmetry breaking. In this paper we study some of the\nphenomenological consequences of this fact, concentrating on enhanced\nbremsstrahlung of EW gauge bosons. We survey a handful of possible new physics\nexperimental searches one can pursue at a 100 TeV collider using this\nphenomenon. The most dramatic effect is the non-negligible radiation of EW\ngauge bosons from neutrinos, making them partly visible objects. The presence\nof collinear EW radiation allows for the full reconstruction of neutrinos under\ncertain circumstances. We also show that the presence of EW radiation allows\none to distinguish the $SU(2)$ quantum numbers of various new physics\nparticles. We consider examples of two completely different new physics\nparadigms, additional gauge groups and SUSY, where the bremsstrahlung radiation\nof $W$ and $Z$ from $W'$s, $Z'$s or stops allows one to determine the couplings\nand the mixing angles of the new particles (respectively). Finally, we show how\nthe emission of $W$s and $Z$s from high $p_T$ Higgs bosons can be used to test\nthe couplings of new physics to the Higgs boson.", "positive": "Dynamical Threshold Enhancement and Resummation in Drell-Yan Production: Partonic cross sections for the production of massive objects in hadronic\ncollisions receive large corrections when the invariant mass of the\ninitial-state partons is just above the production threshold. Since typically\nthe center-of-mass energy of the hadronic collision is much higher than the\nmass of the heavy objects, it is not obvious that these contributions translate\ninto large corrections to the hadronic cross section. Using a recent approach\nto threshold resummation based on effective field theory, we quantify to which\nextent the fall-off of the parton densities at high x leads to a dynamical\nenhancement of the partonic threshold region. With the example of Drell-Yan\nproduction, we study the emergence of an effective physical scale\ncharacterizing the soft emissions in the process. We derive compact analytical\nexpressions for the resummed Drell-Yan cross section and rapidity distribution\ndirectly in momentum space. They are free of Landau-pole singularities and are\ntrivially matched onto fixed-order perturbative calculations. Evaluating the\nresummed cross sections at NNNLL order and matching onto NNLO fixed-order\ncalculations, we perform a detailed numerical analysis of the cross section and\nrapidity distribution in proton-proton collisions." }, { "anchor": "Two-loop electroweak angular-dependent logarithms at high energies: We present results on the two-loop leading and angular-dependent\nnext-to-leading logarithmic virtual corrections to arbitrary processes at\nenergies above the electroweak scale. In the `t Hooft-Feynman gauge the\nrelevant Feynman diagrams involving soft and collinear gauge bosons \\gamma, Z,\nW^\\pm coupling to external legs are evaluated in the eikonal approximation in\nthe region where all kinematical invariants are much larger than the\nelectroweak scale. The logarithmic mass singularities are extracted from\nmassive multi-scale loop integrals using the Sudakov method and alternatively\nthe sector-decomposition method in the Feynman-parameter representation. The\nderivations are performed within the spontaneously broken phase of the\nelectroweak theory, and the two-loop results are in agreement with the\nexponentiation prescriptions that have been proposed in the literature based on\na symmetric SU(2) x U(1) theory matched with QED at the electroweak scale.", "positive": "$O(\u03b1_s)$ corrections to the correlator of finite mass baryon\n currents: We present analytical next-to-leading order results for the correlator of\nbaryonic currents at the three loop level with one finite mass quark. We obtain\nthe massless and the HQET limit of the correlator from the general formula as\nparticular cases. We also give explicit expressions for the moments of the\nspectral density." }, { "anchor": "One-loop renormalization of the chiral Lagrangian for spinless matter\n fields in the SU(N) fundamental representation: We perform the leading one-loop renormalization of the chiral Lagrangian for\nspinless matter fields living in the fundamental representation of SU(N). The\nLagrangian can also be applied to any theory with a spontaneous symmetry\nbreaking of $SU(N)_L\\times SU(N)_R$ to $SU(N)_V$ and spinless matter fields in\nthe fundamental representation. For QCD, the matter fields can be kaons or\npseudoscalar heavy mesons. Using the background field method and heat kernel\nexpansion techniques, the divergences of the one-loop effective generating\nfunctional for correlation functions of single matter fields are calculated up\nto $\\mathcal{O}(p^3)$. They are absorbed by counterterms not only from the\nthird order but also from the second order chiral Lagrangian.", "positive": "Bottomonium suppression in an open quantum system using the quantum\n trajectories method: We solve the Lindblad equation describing the Brownian motion of a Coulombic\nheavy quark-antiquark pair in a strongly coupled quark-gluon plasma using the\nhighly efficient Monte Carlo wave-function method. The Lindblad equation has\nbeen derived in the framework of pNRQCD and fully accounts for the quantum and\nnon-Abelian nature of the system. The hydrodynamics of the plasma is\nrealistically implemented through a 3+1D dissipative hydrodynamics code. We\ncompute the bottomonium nuclear modification factor and compare with the most\nrecent LHC data. The computation does not rely on any free parameter, as it\ndepends on two transport coefficients that have been evaluated independently in\nlattice QCD. Our final results, which include late-time feed down of excited\nstates, agree well with the available data from LHC 5.02 TeV PbPb collisions." }, { "anchor": "The $B^+ \\to J/\u03c8\u03c9K^+ $ reaction and $D^*\\bar{D}^*$ molecular\n states: We study the $B^+ \\to J/\\psi \\omega K^+ $ reaction, measured by the LHCb\ncollaboration, and show that it is driven by the presence of two resonances,\nthe $X(3940)$ and $X(3930)$, that are of molecular nature and couple most\nstrongly to $D^* \\bar{D}^*$, but also to $J/\\psi\\omega$. Because of that, in\nthe $J/\\psi\\omega$ mass distribution we find a peak related to the excitation\nof the resonances and a cusp with large strength at the $D^* \\bar{D}^*$\nthreshold.", "positive": "Discovery reach for generic supersymmetry at the LHC: MT2 versus missing\n transverse momentum selections for pMSSM searches: Different search strategies for supersymmetry have been employed by the LHC\ngeneral-purpose experiments using early data. As proven by their early results,\nthese strategies are promising, but raise the question of how well they will\ngeneralize for the future. We address this question by studying two thousand\nphenomenological minimal supersymmetric standard model parameter space points\nthat come from a fit to indirect and cosmological data. We examine the 5 sigma\ndiscoverability of the points employing a typical ATLAS-type search based on\nmissing transverse momentum (MET), a search based on an optimised MT2 cut and a\ncombination of the two, taking into account standard model backgrounds. The\ndiscovery reach of the strategies can depend strongly on the systematic\nuncertainty in the background, subject to the stringency of the cuts and the\ndetails of the background simulation. By combining the MET and MT2 based\nstrategies, with an integrated luminosity of 1 fb^-1 (10 fb^-1) at 7 TeV, 4-8%\n(42%) of the points are discoverable, depending on the systematic uncertainty\non the background. At 14 TeV and with 10 fb^-1, 96% of the points are\ndiscoverable. While the majority of points can be discovered by both strategies\nat sqrt{s} = 14 TeV and with 1 fb^-1, there are some that are left undiscovered\nby a MET search strategy, but which are discovered by the MT2 strategy, and\nvice versa, therefore it is essential that one performs both in parallel. We\ndiscuss some of the factors that can make points more difficult to observe." }, { "anchor": "Perturbative QCD estimation of the $B \\to K^{*} + \u03b3$ branching\n ratio: Working in a perturbative QCD model approach, we obtain the essential form\nfactor of the radiative transition $B \\rightarrow V^{*} \\gamma$ and estimate\nthe branching ratio $BR(B \\rightarrow K^{*} \\gamma)$. The results are\ndetermined by a parameter expressing the momentum distribution in the $B$ -\nmeson wave function. Our estimations are compared to other theoretical\npredictions as well as to experimental data.", "positive": "LHC/LC Interplay in the MSSM Higgs Sector: The interplay of prospective experimental information from both the Large\nHadron Collider (LHC) and the Linear Collider (LC) in the investigation of the\nMSSM Higgs sector is analyzed in the SPS~1a and SPS 1b benchmark scenarios.\nCombining LHC information on the heavy Higgs states of the MSSM with precise\nmeasurements of the mass and branching ratios of the lightest CP-even Higgs\nboson at the LC provides a sensitive consistency test of the MSSM. This allows\nto set bounds on the trilinear coupling A_t. In a scenario where LHC and LC\nonly detect one light Higgs boson, the prospects for an indirect determination\nof M_A are investigated. In particular, the impact of the experimental errors\nof the other SUSY parameters is analyzed in detail. We find that a precision of\nabout 20% (30%) can be achieved for M_A = 600 (800) GeV." }, { "anchor": "Towards NNLO accuracy for $\\varepsilon'/\\varepsilon$: The quantity $\\varepsilon'/\\varepsilon$ measures direct CP violation in Kaon\ndecays. Recent SM predictions show a $2.9\\sigma$ tension with data, with the\ntheoretical uncertainty dominating. As rapid progress on the lattice is\nbringing nonperturbative long-distance effects under control, a more precise\nknowledge of short-distance contributions is needed. We describe the first NNLO\nresults for $\\varepsilon'/\\varepsilon$ and discuss future prospects, as well as\nissues of scheme dependence and the separation of perturbative and\nnonperturbative effects. Finally we also comment on the solution of the\nrenormalisation-group evolution in one of the talks at this conference and\npresent the correct solution.", "positive": "New leptons with exotic decays: collider limits and dark matter\n complementarity: We describe current and future hadron collider limits on new vector-like\nleptons with exotic decays. We consider the possibility that, besides standard\ndecays, the new leptons can also decay into a Standard Model charged lepton and\na stable particle like a dark photon. To increase their applicability, our\nresults are given in terms of arbitrary branching ratios in the different decay\nchannels. In the case that the dark photon is stable at cosmological scales we\ndiscuss the interplay between the dark photon and the vector-like lepton in\ngenerating the observed dark matter relic abundance and the complementarity of\ncollider searches and dark matter phenomenology." }, { "anchor": "NeXSPheRIO Results on Elliptic-Flow Fluctuations at RHIC: By using the NexSPheRIO code, we study the elliptic-flow fluctuations in\nAu+Au collisions at 200A GeV. It is shown that, by fixing the parameters of the\nmodel to correctly reproduce the charged pseudo-rapidity and the\ntransverse-momentum distributions, reasonable agreement of with data is\nobtained, both as function of pseudo-rapidity as well as of transverse\nmomentum, for charged particles. Our results on elliptic-flow fluctuations are\nin good agreement with the recently measured data in experiments.", "positive": "Decays of Higgs Bosons in the Standard Model and Beyond: We make an updated review and a systematic and comprehensive analysis of the\ndecays of Higgs bosons in the Standard Model (SM) and its three well-defined\nprototype extensions such as the complex singlet extension of the SM (cxSM),\nthe four types of two Higgs-doublet models (2HDMs) without tree-level\nHiggs-mediated flavor-changing neutral current (FCNC) and the minimal\nsupersymmetric extension of the SM (MSSM). We summarize the theoretical\npredictions for the decay widths of the SM Higgs boson and those of Higgs\nbosons appearing in its extensions taking account of all possible decay modes.\nWe incorporate them to study and analyze decay patterns of CP-even, CP-odd, and\nCP-mixed neutral Higgs bosons and charged ones. We put special focus on the\nproperties of a neutral Higgs boson with mass about 125 GeV discovered at the\nLHC and present constraints obtained from precision analysis of it. This review\nis intended to be self-contained and consolidated by coherently integrating\nrelevant physics information for studying decays of Higgs bosons in the SM and\nbeyond." }, { "anchor": "The strange critical endpoint and isentropic trajectories in an Extended\n PNJL Model with Eight Quark Interactions: In this work, we explore the possible existence of several critical endpoints\nin the phase diagram of strongly interacting matter using an extended PNJL\nmodel with 't Hooft determinant and eight quark interactions in the up, down\nand strange sectors. Besides, we also study the isentropic trajectories\ncrossing both (light and strange) chiral phase transitions and around the\ncritical endpoint in both the crossover and first-order transition regions.", "positive": "Transverse structure of electron in momentum space in basis light-front\n quantization: We investigate the leading-twist transverse momentum-dependent distribution\nfunctions (TMDs) for a physical electron, a spin-1/2 composite system\nconsisting of a bare electron and a photon, using the Basis Light-front\nQuantization (BLFQ) framework. The light-front wave functions of the physical\nelectron are obtained from the eigenvectors of the light-front QED Hamiltonian.\nWe evaluate the TMDs using the overlaps of the light-front wave functions. The\nBLFQ results are found to be in excellent agreement with those TMDs calculated\nusing lowest-order perturbation theory." }, { "anchor": "Chiral dynamics with strange quarks: Mysteries and opportunities: Recent developments and open issues in chiral dynamics with strange quarks\nare reviewed. Topics include: Order parameters of chiral symmetry breaking, the\nflavor dependence of these order parameters, speculations about the phase\nstructure of QCD with varying number of flavors, OZI violation and its natural\nemergence in case of a small strange quark condensate, heavy kaon chiral\nperturbation theory, an update on pion-pion, pion-kaon and pion-nucleon sigma\nterms, the dynamics and nature of scalar mesons, the role of the scalar pion\nand kaon form factors, attempts to describe some strange baryons employing\ncoupled channel dynamics tied to unitarity and chiral perturbation theory, and\nthe role of final state interactions in Goldstone boson pair production in\nproton-proton collisions.", "positive": "Calculations with off-shell matrix elements, TMD parton densities and\n TMD parton showers: A new calculation using off-shell matrix elements with TMD parton densities\nsupplemented with a newly developed initial state TMD parton shower is\ndescribed. The calculation is based on the KaTie package for an automated\ncalculation of the partonic process in high-energy factorization, making use of\nTMD parton densities implemented in TMDlib. The partonic events are stored in\nan LHE file, similar to the conventional LHE files, but now containing the\ntransverse momenta of the initial partons. The LHE files are read in by the\nCASCADE package for the full TMD parton shower, final state shower and\nhadronization from PYTHIA where events in HEPMC format are produced. We have\ndetermined a full set of TMD parton densities and developed an initial state\nTMD parton shower, including all flavors following the TMD distribution. As an\nexample of application we have calculated the azimuthal de-correlation of high\npt dijets as measured at the LHC and found very good agreement with the\nmeasurement when including initial state TMD parton showers together with\nconventional final state parton showers and hadronization." }, { "anchor": "WPHACT 1.0 - A program for $WW$, Higgs and 4 fermion physics at $e^+\n e^-$ colliders: WPHACT (W W and Higgs Physics with PHACT) is a MC program and unweighted\nevent generator which computes all Standard Model processes with four fermion\nin the final state at $e^+ e^-$ colliders. It is based on an helicity amplitude\nmethod which allows precise and fast evaluations of the matrix elements both\nfor massless and massive fermions. Fermion masses for $b$ quarks are exactly\ntaken into account. QED initial state and Coulomb corrections are evaluated,\nwhile QCD final state corrections are included in an approximate formulation.\nCuts can be easily introduced and distributions for any variable at parton\nlevel can be implemented. The contributions to the processes of neutral\nStandard Model or Susy Higgs can be included. Anomalous couplings effects for\nthe triple coupling can be computed. An interface to hadronization is provided\nand Jetset can be directly called from the program.", "positive": "Belle II sensitivity to long-lived dark photons: In this letter we point out that the Belle II experiment has a unique\nsensitivity to visibly decaying long-lived dark photons. Concentrating on the\nsignatures with a single high energy photon in association with a displaced\npair of charged particles, we find that Belle II will be able to probe large\nregions of parameter space that cannot be covered by any other running or\nproposed experimental facility. While the signature with charged muons or pions\nin the final state is expected to be background-free after all selections are\napplied, the case of final state electrons is more involved and requires an\nin-depth study. We discuss possible ways to further suppress backgrounds and\nthe corresponding experimental prospects." }, { "anchor": "$\u03b5_b$ Constraints on Self--Couplings of Vector Bosons: We analyze the constraints on possible anomalous contributions to the\n$W^+W^-Z$ vertex coming from non-universal radiative corrections to the $Z\n\\rightarrow b \\bar{b}$ width. We parametrize these corrections in terms of\n$\\epsilon_b$ and use the LEP data to establish the allowed values for the\nanomalous triple couplings. We examine all CP conserving effective operators\nthat exhibit $SU(2)_L\\times U(1)_Y$ gauge invariance and do not give any tree\nlevel contribution to the present experimental observables. For some of these\noperators our constraints are comparable with the bounds coming from a global\nfit of the oblique parameters, which evidences the increasing relevance of the\nprecise measurement of the $b$--quark parameters at LEP for the search of new\nphysics.", "positive": "Spin asymmetries in one-jet production at RHIC with polarized proton\n beams : the effects of a hadrophilic Z': We show that the measurement of some parity violating asymmetry in the\nproduction of a large ET jet could reveal the presence of a new hadrophilic Z'\nsuch as the one recently introduced to interpret possible departures from the\nStandard Model predictions both at LEP and at CDF. Such a measurement could be\nperform within a few years by the RHIC Spin Collaboration (RSC) using the\nRelativistic Heavy Ion Collider (RHIC) as a polarized proton-proton collider." }, { "anchor": "Wilson Coefficients and Natural Zeros from the On-Shell Viewpoint: We show how to simplify the calculation of the finite contributions from\nheavy particles to EFT Wilson coefficients by using on-shell methods. We apply\nthe technique to the one-loop calculation of $g-2$ and $H\\gamma\\gamma$, showing\nhow finite contributions can be obtained from the product of tree-level\namplitudes. In certain cases, due to a parity symmetry of these amplitudes, the\ntotal contribution adds up to zero, as previously found in the literature. Our\nmethod allows to search for new natural zeros, as well as to obtain non-zero\ncontributions in a straightforward way.", "positive": "SU(3)--Breaking Effects in Axial--Vector Couplings of Octet Baryons: Present evidence on baryon axial--vector couplings is reviewed, the main\nemphasis being on internal consistency between asymmetry and rate data. A\ncomplete account of all {\\sl small} terms in the Standard Model description of\nthese latter leads to {\\sl both} consistency {\\sl and} evidence for breaking of\nflavour SU(3) in the axial couplings of octet baryons.\n Talk presented at \"5th Int. Sympos. on Meson--Nucleon Physics and the\nStructure of the Nucleon\", Boulder, CO, sept. 1993. To be published in $\\pi N$\nNewsletter." }, { "anchor": "Searching for T-Violating, P-Conserving New Physics with Neutrons: The observance of parity conserving time reversal violation in light quark\nsystems could signal the presence of physics beyond the Standard Model. I\ndiscuss the implications of low-energy time reversal tests for the existence of\nsuch T-violating, P-conserving (TVPC) interactions. I argue that searches for\npermanent electric dipole moments (EDM's) and direct TVPC searches provide\ncomplementary information on P-conserving T-violation. EDM searches yield\nconstraints only under the assumption that parity symmetry is restored at the\nscale Lambda associated with new TVPC physics. If parity remains broken at\nshort distances, direct searches yield the least ambiguous bounds. In the\nlatter case, improving the experimental precision of direct TVPC searches in\nneutron beta-decay and polarized epithermal neutron transmission at the\nSpallation Neutron Source could yield tighter bounds.", "positive": "Higgs and Top Masses from Dynamical Symmetry Breaking - Revisited: We re-examine our former predictions \\cite{kahanath1,kahanath2} of the top\nand Higgs masses via dynamical symmetry breaking in a 4-fermion theory which\nproduces the Higgs as a bound state, and relates the top and Higgs masses to\n$m_W$. The use of dynamical symmetry breaking was stongly motivated by the\napparent equality, within a factor of two, of the known and expected masses of\nthe $W$, $Z$, top and Higgs. In later work \\cite{kahanath2} we evaluated the\nmasses self-consistently at the mass-poles, which resulted in predictions of\n$m_t \\sim 175$ GeV, and $m_H \\sim 125$ GeV as central values within ranges\nproduced by varying the measured strong coupling. Figures (1) and (2) result\nfrom evolution down to $m_W$ while the number quoted for the top quark mass,\ni.e. 175 GeV includes an evolution back up to the top and use of the\ndetermination of $\\alpha_s$ at LEP at that time. $m_H$ is less dependent on the\nvalue of the strong coupling. The variation of the predicted masses for a range\nof the strong and electro-weak couplings $\\alpha_s$, $\\alpha_W$ at $m_W$ are\nexhibited in Figure (3) and Figure (4) reproduced from the last work\n\\cite{kahanath2}, which was submitted to PRD well before the first FNAL\npublications \\cite{CDF1,D0top} suggesting evidence for the top." }, { "anchor": "Colour Correlations and Multiplicities in Top Events: In events of the type e+ e- -> t tbar -> b W+ bbar W-, particle production\ncould depend in a non-trivial way on the kinematics of the process. Energetic\nperturbative gluon radiation can be generated (when kinematically allowed) by\nthe original t tbar system and by the t -> b W+ and tbar -> bbar W- decays,\nwith negligible interference between the production and decay stages and\nbetween the t and tbar decays. Soft perturbative gluon emission and\nnon-perturbative fragmentation does introduce a correlation, however. To\nillustrate the size of these effects, we study the multiplicity as a function\nof the angle between the b and bbar jets, close to the t tbar threshold. Also\npotential uncertainties in top mass determinations are briefly addressed.", "positive": "Cosmological Constraints on Strongly Coupled Moduli from Cosmic Strings: Cosmological constraints on moduli, whose coupling to matter is stronger than\nPlanck mass suppressed coupling, are derived. In particular, moduli are\nconsidered to be produced by oscillating loops of cosmic strings and\nconstraints are obtained from their effects on big bang nucleosynthesis and\ntheir contribution to diffuse gamma ray background and dark matter. Large\nvolume and warped Type-IIB flux compactifications are taken as examples where\nstrongly coupled moduli are present. Finally, the constraints on cosmic string\ntension, modulus mass and modulus coupling constant are obtained and it is\nshown that the constraints are relaxed significantly when the coupling constant\nis large enough. In addition, the effects of thermal production of moduli are\nconsidered and the corresponding constraints are derived." }, { "anchor": "Predictions for Proton Lifetime in Minimal Non-Supersymmetric SO(10)\n Models: An Update: We present our best estimates of the uncertainties due to heavy particle\nthreshold corrections on the unification scale $M_U$, intermediate scale $M_I$\nand coupling constant Alpha_U in the minimal non-supersymmetric SO(10) models.\nUsing these , we update the predictions for proton life-time in these models.", "positive": "Exotics at Our Home: I. Light Scalars as Four-quark States II. Isotensor Tensor Tensor\nE(1500-1600) State III. X(3872) State as Charmonium \\chi_{c1}(2P) IV. Two-gluon\nAnnihilation of Charmonium \\chi_{c2}(2P) There are considered problems of the\nexotic states, in which the author with his collaborators has made clear\nphysical predictions, considerable part of wich is supported by experement\nalready" }, { "anchor": "Studying the Higgs Potential at the e+e- Linear Collider: The determination of the shape of the Higgs potential is needed to complete\nthe investigation of the Higgs profile and to obtain a direct experimental\nproof of the mechanism of electro-weak symmetry breaking. This can be achieved,\nat a linear collider, by determining the Higgs triple self-coupling g_HHH in\nthe processes e+e--> HHZ and HHnunu and, possibly, the quartic coupling. This\npaper summarises the results of a study of the expected accuracies on the\ndetermination of g_HHH at a TeV-class LC and at a multi-TeV LC. The statistical\ndilution arising from contributions not sensitive to the triple Higgs vertex,\ncan be reduced by means of variables sensitive to the kinematics and the spin\nproperties of the reactions.", "positive": "Limits on scalar leptoquark interactions and consequences for GUTs: A colored weak singlet scalar state with hypercharge 4/3 is one of the\npossible candidates for the explanation of the unexpectedly large\nforward-backward asymmetry in t tbar production as measured by the CDF and D0\nexperiments. We investigate the role of this state in a plethora of flavor\nchanging neutral current processes and precision observables of down-quarks and\ncharged leptons. Our analysis includes tree- and loop-level mediated\nobservables in the K and B systems, the charged lepton sector, as well as the Z\nto b bbar decay width. We perform a global fit of the relevant scalar\ncouplings. This approach can explain the (g-2)_mu anomaly while tensions among\nthe CP violating observables in the quark sector, most notably the nonstandard\nCP phase (and width difference) in the Bs system cannot be fully relaxed. The\nresults are interpreted in a class of grand unified models which allow for a\nlight colored scalar with a mass below 1TeV. We find that the renormalizable\nSU(5) scenario is not compatible with our global fit, while in the SO(10) case\nthe viability requires the presence of both the 126- and 120-dimensional\nrepresentations." }, { "anchor": "On Branching Ratios of $B_s$ Decays and the Search for New Physics in\n $B^0_s\\to \u03bc^+\u03bc^-$: The LHCb experiment has recently established a sizable width difference\nbetween the mass eigenstates of the $B_s$-meson system. This phenomenon leads\nto a subtle difference at the 10% level between the experimental branching\nratios of $B_s$ decays extracted from time-integrated, untagged data samples\nand their theoretical counterparts. Measuring the corresponding effective\n$B_s$-decay lifetimes, both branching ratio concepts can be converted into each\nother. The rare decay $B^0_s\\to \\mu^+\\mu^-$ and the search for New Physics\nthrough this channel is also affected by this effect, which enhances the\nStandard-Model reference value of the branching ratio by O(10%), while the\neffective lifetime offers a new observable to search for physics beyond the\nStandard Model that is complementary to the branching ratio.", "positive": "Resonance decay dynamics and their effects on $p_T$-spectra of pions in\n heavy-ion collisions: We examine the influence of resonance decay dynamics on momentum spectra of\npions in heavy-ion collisions. Taking the decay $\\omega \\rightarrow 3 \\pi$ as\nan example, we demonstrate how details of the decay matrix element can modify\nthe physical observables. Such a dynamical effect is commonly neglected in\nstatistical models. To remedy the situation, we formulate a theoretical\nframework for incorporating hadron dynamics into the analysis, which can be\nstraightforwardly extended to describe general N-body decays." }, { "anchor": "Hierarchy problem, gauge coupling unification at the Planck scale, and\n vacuum stability: To solve the hierarchy problem of the Higgs mass, it may be suggested that\nthere are no an intermediate scale up to the Planck scale except for the TeV\nscale. For this motivation, we investigate possibilities of gauge coupling\nunification (GCU) at the Planck scale ($M_{Pl} = 2.4 \\times 10^{18}\\,{\\rm\nGeV}$) by adding extra particles with the TeV scale mass into the standard\nmodel. We find that the GCU at the Planck scale can be realized by extra\nparticles including some relevant scalars, while it cannot be realized only by\nextra fermions with the same masses. On the other hand, when extra fermions\nhave different masses, the GCU can be realized around $\\sqrt{8 \\pi} M_{Pl}$. By\nthis extension, the vacuum can become stable up to the Planck scale.", "positive": "TeV scale gravity, mirror universe, and ... dinosaurs: This is somewhat extended version of the talk given at the Gran Sasso Summer\nInstitute: Massive Neutrinos in Physics and Astrophysics. It describes general\nideas about mirror world, extra spatial dimensions and dinosaur extinction.\nSome suggestions are made how these seemingly different things can be related\nto each other." }, { "anchor": "Open charm-bottom scalar tetraquarks and their strong decays: The mass and meson-current coupling of the diquark-antidiquark states with\nthe quantum numbers $J^{P}=0^{+}$ and quark contents $Z_{q}=[cq][\\bar {b} \\bar\nq ]$ and $Z_{s}=[cs][\\bar {b} \\bar s]$ are calculated using two-point QCD sum\nrule approach. In calculations the quark, gluon and mixing condensates up to\neight dimensions are taken into account. The parameters of the scalar\ntetraquarks extracted from this analysis are employed to explore the strong\nvertices $Z_q B_c \\pi $, $Z_q B_c \\eta $ and $Z_s B_c \\eta $ and compute the\ncouplings $g_{Z_qB_c \\pi }$, $g_{Z_qB_c \\eta }$ and $g_{Z_sB_c \\eta }$. The\nstrong couplings are obtained within the soft-meson approximation of QCD\nlight-cone sum rule method: they form, alongside with other parameters, the\nbasis for evaluating the widths of $Z_q \\to B_c \\pi$, $% Z_q \\to B_c \\eta$ and\n$Z_s \\to B_c \\eta$ decays. Obtained in this work results for the mass of the\ntetraquarks $Z_{q}$ and $Z_{s}$ are compared with available predictions\npresented in the literature.", "positive": "Transplanckian collisions at future accelerators: Scattering at transplanckian energies offers model independent tests of TeV\nscale gravity. Black-hole production is one spectacular signal, though a full\ncalculation of the cross section is not yet available. Another signal is given\nby gravitational elastic scattering, which is maybe less spectacular but which\ncan be nicely computed in the forward region using the eikonal approximation.\nIn this talk I discuss the distinctive signatures of eikonalized scattering at\nfuture accelerators." }, { "anchor": "Spin light of relativistic electrons in neutrino fluxes: A new mechanism of electromagnetic radiation by electrons under the influence\nof a dense neutrino flux, termed \"the spin light of electron\" in neutrino flux\n($SLe_\\nu$), is considered. It is shown that in the case when electrons are\nmoving against the neutrino flux with relativistic energy there is a reasonable\nincrease of the efficiency of the energy transfer from the neutrino flux to the\nelectromagnetic radiation by the $SLe_\\nu$ mechanism. The proposed radiation\nprocess is applied to an astrophysical environment with characteristics\npeculiar to supernovae. It is shown that a reasonable portion of energy of the\nneutrino flux can be transferred by the $SLe_\\nu$ to gamma-rays .", "positive": "The QCD equation of state near T_0 within a quasi-particle model: We present a description of the equation of state of strongly interacting\nmatter within a quasi-particle model. The model is adjusted to lattice QCD data\nnear the deconfinement temperature $T_c$. We compare in detail the excess\npressure at non-vanishing chemical potential and its expansion coefficients\nwith two-flavor lattice QCD calculations and outline prospects of the\nextrapolation to large baryon density." }, { "anchor": "Angular Distributions in Higgs Decays: A new theory yields unconventional results for the angular distribution of\nproducts like $b-\\bar{b}$ jets in Higgs decays.", "positive": "Classical chromo-dynamics of relativistic heavy ion collisions: Relativistic heavy ion collisions produce thousands of particles, and it is\nsometimes difficult to believe that these processes allow for a theoretical\ndescription directly in terms of the underlying theory - QCD. However once the\nparton densities are sufficiently large, an essential simplification occurs -\nthe dynamics becomes semi-classical. As a result, a simple ab initio approach\nto the nucleus--nucleus collision dynamics may be justified. In these lectures,\nwe describe the application of these ideas to the description of\nmulti--particle production in relativistic heavy ion collisions. We also\ndiscuss the role of semi-classical fields in the QCD vacuum in hadron\ninteractions at low and high energies." }, { "anchor": "Quarkonium and glueball admixtures of the scalar-isoscalar resonances\n f0(1370), f0(1500) and f0(1710): Using the U(3)R x U(3)L extended Linear Sigma Model with the ordinary\n(pseudo)scalar and (axial)vector mesons as well as a scalar glueball, we study\nthe vacuum phenomenology of the scalar-isoscalar resonances f0(1370), f0(1500)\nand f0(1710). We present here a solution, based only on the masses and not yet\non decays, in which the resonances f0(1370) and f0(1500) are predominantly\nnonstrange and strange qbar-q states respectively, and the resonance f0(1710)\nis predominantly a scalar glueball.", "positive": "CP-Violation in b Quark Radiative Inclusive Decays: The direct CP-violations in $SU(2)_{L}\\times SU(2)_{R} \\times U(1)$ model and\ntwo-Higgs doublet extension of the standard model for $b \\to d\\gamma$ and $b\n\\to s\\gamma$ decays are investigated. The calculated value of CP-asymmetry for\nthese two models and for $b \\to d\\gamma$ and $b \\to s\\gamma$ decays for the\nwide range of parameters may exceed the value, predicted by the standard model\nand has a sign opposite to that of the latter." }, { "anchor": "Radiative Heavy Meson Transitions: We evaluate the radiative and hadronic decay rates of the $D^*$ mesons using\nthe Heavy Quark Effective Theory and the Vector Meson Dominance hypothesis. We\nalso estimate the width of the $B^*$ electromagnetic transitions and the\nradiative decays of positive parity $J^P=0^+, 1^+$ charmed mesons.", "positive": "Nonfactorizable effects in B -> J/psi K: The method of QCD light-cone sum rules is used to calculate soft\nnonfactorizable contributions to the decay amplitude for B -> J/psi K. The\nresult confirms expectations that in color-suppressed decays nonfactorizable\ncorrections can be sizable." }, { "anchor": "Three-loop master integrals for ladder-box diagrams with one massive leg: The three-loop master integrals for ladder-box diagrams with one massive leg\nare computed from an eighty-five by eighty-five system of differential\nequations, solved by means of Magnus exponential. The results of the considered\nbox-type integrals, as well as of the tower of vertex- and bubble-type master\nintegrals associated to subtopologies, are given as a Taylor series expansion\nin the dimensional regulator parameter epsilon = (4-d)/2. The coefficients of\nthe series are expressed in terms of uniform weight combinations of multiple\npolylogarithms and transcendental constants up to weight six. The considered\nintegrals enter the next-to-next-to-next-to-leading order virtual corrections\nto scattering processes like the three-jet production mediated by vector boson\ndecay, V* -> jjj, as well as the Higgs plus one-jet production in gluon fusion,\npp -> Hj.", "positive": "Virtual Hadronic and Leptonic Contributions to Bhabha Scattering: Using dispersion relations, we derive the complete virtual QED contributions\nto Bhabha scattering due to vacuum polarization effects in photon propagation.\nWe apply our result to hadronic corrections and to heavy lepton and top quark\nloop insertions. We give the first complete estimate of their net numerical\neffects for both small and large angle scattering at typical beam energies of\nmeson factories, LEP, and the ILC. The effects turn out to be smaller, in most\ncases, than those corresponding to electron loop insertions, but stay, with\namounts of typically one per mille, of relevance for precision experiments.\nHadronic corrections themselves are typically about 2-3 times larger than those\nof intermediate muon pairs (the largest heavy leptonic terms)." }, { "anchor": "Scalar and higher even spin glueball masses from an anomalous modified\n holographic model: In this work, within an anomalous modified holographic softwall model, we\ncalculate analytically the masses of the scalar glueball with its radial\nexcitations and higher even glueball spin states, with $P=C=+1$, from a single\nmass equation. Using this approach we achieved an unified treatment for both\nscalar and high even spin glueballs masses. Furthermore, we also obtain the\nRegge trajectory associated with the pomeron compatible with other approaches.", "positive": "QCD Equation of State From a Chiral Hadronic Model Including Quark\n Degrees of Freedom: This work presents an effective model for strongly interacting matter and the\nQCD equation of state (EoS). The model includes both hadron and quark degrees\nof freedom and takes into account the transition of chiral symmetry restoration\nas well as the deconfinement phase transition. At low temperatures $T$ and\nbaryonic densities $\\rho_B$ a hadron resonance gas is described using a\nSU(3)-flavor sigma-omega model and a quark phase is introduced in analogy to\nPNJL models for higher $T$ and $\\rho_B$. In this way, the correct asymptotic\ndegrees of freedom are used in a wide range of $T$ and $\\rho_B$. Here, results\nof this model concerning the chiral and deconfinement phase transitions and\nthermodynamic model properties are presented. Large hadron resonance\nmultiplicities in the transition region emphasize the importance of heavy-mass\nresonance states in this region and their impact on the chiral transition\nbehavior. The resulting phase diagram of QCD matter at small chemical\npotentials is in line with latest lattice QCD and thermal model results." }, { "anchor": "Chiral phonons as dark matter detectors: We propose a method for detecting single chiral phonons that will enable\ntheir use as dark-matter detectors. We suggest metal--organic frameworks (MOFs)\nas detector materials, as their flexibility yields low-energy chiral phonons\nwith measurable magnetic moments, and their anisotropy leads to directional\nsensitivity, which mitigates background contamination. To demonstrate our\nproposal, we calculate the phononic structure of the MOF\nInF$_3$($4,4'$-bipyridine), and show that it has highly chiral acoustic\nphonons. Detection of such chiral phonons via their magnetic moments would\ndramatically lower the excitation energy threshold for dark matter detection to\nthe energy of a single phonon. We show that single phonon detection in a MOF\nwould extend detector reach ten or more orders of magnitude below current\nlimits, enabling exploration of a multitude of as-yet-unprobed dark matter\ncandidates.", "positive": "Dark $Z$ Implication for Flavor Physics: Dark $Z$/dark photon ($Z'$) is one candidate of dark force carrier, which\nhelps to interpret the properties of dark matter (DM). Other than traditional\nstudies of DM including direct detection, indirect detection and collider\nsimulation, in this work we take flavor physics as a complementary approach to\ninvestigate the features of dark matter. We give an exact calculation of the\nnew type of penguin diagram induced by $Z'$ which further modifies the\nwell-known $X, Y, Z$ functions in penguin-box expansion. The measurement of\nrare decays $B\\to K^{(*)}\\mu^+\\mu^-$ and $B_s\\to \\mu^+\\mu^-$ at LHC, together\nwith direct CP violation $\\varepsilon'/\\varepsilon$ in $K\\to\\pi \\pi$ as well as\n$K_L\\to\\mu^+\\mu^-$, are used to determine the parameter space. The size of\ncoupling constant, however, is found to be $\\mathcal{O}(1)$ which is much\nweaker than the known constraints." }, { "anchor": "Dark Matter Is The New BBN: Measurements of the primordial element abundances provide us with an\nimportant probe of our universe's early thermal history, allowing us to\nconstrain the expansion rate and composition of our universe as early as $\\sim\n1 \\, {\\rm s}$ after the Big Bang. Prior to this time, we have essentially no\nempirical information on which to base any such claims. In this paper, we\nimagine a future time in which we have not only detected the particles that\nmake up the dark matter, but have measured their mass and annihilation cross\nsection with reasonable precision. In analogy to the light element abundances,\nthe dark matter abundance in this scenario could be used to study and constrain\nthe expansion rate and composition of our universe at the time of dark matter\nfreeze out, which for a standard thermal relic occurs at $T_f \\sim\nm_{\\chi}/20$, corresponding to $t \\sim 4 \\times 10^{-10} \\, {\\rm s} \\times\n({\\rm TeV}/m_{\\chi})^2$, many orders of magnitude prior to the onset of Big\nBang nucleosynthesis. As examples, we consider how such measurements could be\nused to constrain scenarios which feature exotic forms of radiation or matter,\na ultralight scalar, or modifications to gravity, each of which have the\npotential to be much more powerfully probed with dark matter than with the\nlight element abundances.", "positive": "Radiative Corrections to Triple Higgs Coupling and Electroweak Phase\n Transition: Beyond One-loop Analysis: We evaluate dominant two-loop corrections to the triple Higgs coupling and\nstrength of a first-order electroweak phase transition in the inert Higgs\ndoublet model. It is found that sunset diagrams can predominantly enhance the\nformer and reduce the latter. As a result, the triple Higgs coupling normalized\nby the standard model value at two-loop level is more enhanced than the\ncorresponding one-loop value." }, { "anchor": "Dynamical Growth Rate of a Diffuse Interface in First Order Phase\n Transitions: We compute the dynamical prefactor in the nucleation rate of bubbles or\ndroplets in first order phase transitions for the case where both viscous\ndamping and thermal dissipation are significant. This result, which generalizes\nprevious work on nucleation, may be applied to study the growth of bubbles or\ndroplets in condensed matter systems as well as in heavy ion collisions and in\nthe expansion of the early universe.", "positive": "Global Power Counting Analysis On Probing Electroweak Symmetry Breaking\n Mechanism At High Energy Colliders: We develop a precise power counting rule (a generalization of Weinberg's\ncounting method for the nonlinear sigma model) for the electroweak theories\nformulated by chiral Lagrangians. Then we estimate the contributions of ``all''\nnext-to-leading order (NLO) bosonic operators to the amplitudes of the relevant\nscattering processes which can be measured at high energy colliders, such as\nthe LHC and future Linear Colliders. Based upon these results, we globally\nclassify the sensitivities of testing all NLO bosonic operators for probing the\nelectroweak symmetry breaking mechanism at high energy colliders." }, { "anchor": "Indirect Detection of Self-Interacting Asymmetric Dark Matter: Self-interacting dark matter resolves the issue of cuspy profiles that appear\nin non-interacting cold dark matter simluations; it may additionally resolve\nthe so-called \"too big to fail\" problem in structure formation. Asymmetric dark\nmatter provides a natural explanation of the comparable densities of baryonic\nmatter and dark matter. In this paper, we discuss unique indirect detection\nsignals produced by a minimal model of self-interacting asymmetric scalar dark\nmatter. Through the formation of dark matter bound states, a dark force\nmediator particle may be emitted; the decay of this particle may produce an\nobservable signal. We estimate the produced signal and explicitly demonstrate\nparameters for which the signal exceeds current observations.", "positive": "Leptonic CP Violation at the neutrino factory: In this talk, based on the work \\cite{cpviolation}, we refine our previous\nanalysis \\cite{golden} of the sensitivity to leptonic CP violation and\n$\\tetaot$ at a neutrino factory in the LMA-MSW scenario, by exploring the full\nrange of these two parameters. We have discovered that there exist, at fixed\nneutrino energy, $E_\\nu$, and baseline, $L$, degenerate solutions. Although the\nspectral analysis helps in disentangling fake from true solutions, a leftover\nproduct of this degeneracy remains for a realistic detector, which we analyse.\nFurthermore, we take into account the expected uncertainties on the solar and\natmospheric oscillation parameters and in the average Earth matter density\nalong the neutrino path. An intermediate baseline of O(3000) km is still the\nbest option to tackle CP violation, although a combination of two baselines\nturns out to be very important in resolving degeneracies. This summary is based\non a talk given at NUFACT01, May 2001, Tsukuba (Japan)." }, { "anchor": "Effective Theory Approach to the Spontaneous Breakdown of Lorentz\n Invariance: We generalize the coset construction of Callan, Coleman, Wess and Zumino to\ntheories in which the Lorentz group is spontaneously broken down to one of its\nsubgroups. This allows us to write down the most general low-energy effective\nLagrangian in which Lorentz invariance is non-linearly realized, and to explore\nthe consequences of broken Lorentz symmetry without having to make any\nassumptions about the mechanism that triggers the breaking. We carry out the\nconstruction both in flat space, in which the Lorentz group is a global\nspacetime symmetry, and in a generally covariant theory, in which the Lorentz\ngroup can be treated as a local internal symmetry. As an illustration of this\nformalism, we construct the most general effective field theory in which the\nrotation group remains unbroken, and show that the latter is just the\nEinstein-aether theory.", "positive": "An Upper Bound on the Higgs Boson Mass from Yukawa Unification and a\n Comment on Vacuum Stability Constraints: Only small regions in the $m_{t} - \\tan\\beta$ plane are allowed when\nconsidering simultaneously (assuming the MSSM) coupling constant unification\nand (minimal) GUT relations among Yukawa couplings (i.e., $h_{b} = h_{\\tau}$ at\nthe unification point). In particular, if $m_{t} \\simle 175$ GeV we find that\nonly $1 \\simle \\tan\\beta \\simle 1.5$ or $\\tan\\beta \\simgr 40 \\pm 10$ is\nallowed. The former implies that the light Higgs boson is $\\simle 110$ GeV and,\nin principle, visible to LEPII. The prediction for the Higgs boson mass in the\n$\\tan\\beta \\approx 1$ scenario is discussed and uncertainties related to ($i$)\nvacuum stability constraints, ($ii$) different methods for calculating the\nHiggs boson mass, ($iii$) two-loop calculations and ($iv$) GUT corrections are\nbriefly reviewed. It is shown that large left-right mixing between the\n$t$-scalars can significantly enhance the Higgs boson mass. That and an\nambiguity in the size of the two-loop correction lead to our conservative upper\nbound of 110 GeV. Vacuum stability considerations constrain the $t$-scalar\nmixing and slightly diminish the upper bound (depending on the value of\n$m_{t}$). Improved two-loop calculations are also expected to strengthen the\nbound." }, { "anchor": "Theoretical Aspects of Particle Production: These lectures describe some of the latest data on particle production in\nhigh-energy collisions and compare them with theoretical calculations and\nmodels based on QCD. The main topics covered are: fragmentation functions and\nfactorization, small-x fragmentation, hadronization models, differences between\nquark and gluon fragmentation, current and target fragmentation in deep\ninelastic scattering, and heavy quark fragmentation.", "positive": "Inflating to the Weak Scale: We present a new solution to the hierarchy problem, where the Higgs mass is\nat its observed electroweak value because such a patch inflates the most in the\nearly universe. If the Higgs mass depends on a field undergoing quantum\nfluctuations during inflation, then inflation will fill the universe with the\nHiggs mass that corresponds to the largest vacuum energy. The hierarchy problem\nis solved if the maximum vacuum energy occurs for the observed Higgs mass. We\ndemonstrate this notion with a proof-of-principle model containing an axion, a\nmodulus field and the Higgs, and show that inflation can be responsible for the\nweak scale." }, { "anchor": "Muon (g-2) from the bulk neutrino field in a warped extra dimensional\n model: In the Randall-Sundrum model, a bulk neutrino field in the 5-dimensional\nspace-time can give rise to tiny Dirac masses to neutrinos. In such a scenario,\nwe have computed the contribution of the bulk neutrino field to the anomalous\nmagnetic moment $(g-2)_\\mu$ of muon. We have computed this contribution in the\n't Hooft-Feynman gauge and have found that the contribution has the right sign\nto fit the current discrepancy between the experiment and the standard model\nvalue of $(g-2)_\\mu$. We have also studied possible constraints on the model\nparameters by including contributions to $(g-2)_\\mu$ from other sources such as\nbulk gravitons.", "positive": "Physics Involved in Neutrino Oscillation: Neutrino oscillation is discussed with emphases placed more on its conceptual\naspects. After reviewing the two conventional formulations, referred to here as\nthe same-energy prescription and the same-momentum prescription, wave packet\ntreatments are developed for each of these two prescriptions. Both wave packets\nlocalized in space and those in time are considered, and, by invoking\nrelativistic kinematics as well, the necessary conditions for oscillation to\noccur are derived, which appear to have a form more well-defined and\nquantitative than what have been noted before. Some phenomenological\nimplications suggested by the wave packet treatments are briefly mentioned.\nFinally, as a possible third prescription, the same-velocity prescription is\ngiven." }, { "anchor": "Some low energy effects of a light stabilized radion in the\n Randall-Sundrum model: In this paper we study some low energy effects of a light stabilized radion\nin the Randall-Sundrum scenario. We find that the NLC 500 with its projected\nprecision level will be able to probe the radion contribution to the anomalous\nmagnetic moment and electric quadrupole moment of W boson for values of radion\nvev up to 500 Gev. On the other hand the BNL experiment E821 will be able to\ntest the radion contribution to $a_{\\mu}$ for 1 Tev radion vev and $m_{\\phi}\\le\nm_{\\mu}$. We have also shown that the higgs-radion mixing induces a 2.6%\ncorrection in the WWh coupling. Finally by comparing the radionstrahlung with\nthe higgsstrahlung process we have found that the LEPI bound on the higgs mass\nbased on $Z\\to hl\\bar{l}$ decay mode suggests a lower bound of about 35 Gev on\nthe radion mass.", "positive": "Charm jets as a probe for strangeness at the future Electron-Ion\n Collider: We explore the feasibility of the measurement of charm-jet cross sections in\ncharged-current deep-inelastic scattering at the future Electron-Ion Collider.\nThis channel provides clean sensitivity to the strangeness content of the\nnucleon in the high-$x$ region. We estimate charm-jet tagging performance with\nparametrized detector simulations. We show the expected sensitivity to various\nscenarios for strange parton distribution functions. We argue that this\nmeasurement will be key to future QCD global analyses, so it should inform EIC\ndetector designs and luminosity requirements." }, { "anchor": "Kinetic and Chemical Equilibration in Scalar phi^4 Theory: Approximations based on the 2PI effective action are used to investigate the\nprocess of equilibration in phi^4 theory in 3+1 dimensions, both in the\nsymmetric and broken phase. A special emphasis is put on the study of the\nkinetic and chemical equilibration.", "positive": "Exotic Fermions and Bosons in the Quartification Model: Exotic fermions of half-integral charges at the TeV energy scale are\npredicted by the quartification model of Babu, Ma, and Willenbrock. We add to\nthese one copy of their scalar analogs and discuss the ensuing phenomenological\nimplications, i.e. radiative contributions to lepton masses and flavor-changing\nleptonic decays." }, { "anchor": "R-invariant Natural Unification: We construct R-invariant unification models where a pair of massless Higgs\ndoublets is naturally obtained. The masslessness of the Higgs doublets is\nguaranteed by the unbroken R symmetry. Mass generation for the Higgs doublets\nis considered from various viewpoints.", "positive": "Neutron in Strong Magnetic Fields: Relativistic world-line Hamiltonian for strongly interacting 3q systems in\nmagnetic field is derived from the path integral for the corresponding Green's\nfunction. The neutral baryon Hamiltonian in magnetic field obeys the\npseudomomentum conservation and allows a factorization of the c.m. and internal\nmotion. The resulting expression for the baryon mass in magnetic field is\nwritten explicitly with the account of hyperfine, OPE and OGE (color Coulomb)\ninteraction. The neutron mass is fast decreasing with magnetic field, losing\n1/2 of its value at eB~0.25 GeV^2 and is nearly zero at eB~0.5 GeV^2. Possible\nphysical consequences of the calculated mass trajectory of the neutron, M_n(B),\nare presented and discussed." }, { "anchor": "Topcolor Dynamics and The effective gluon-gluon-Higgs Operator: We discuss the production of the composite Higgs boson in topcolor models via\nthe gluon fusion process. We consider the contribution of color-octet massive\ngauge bosons (colorons) strongly interacting with the top quark, in addition to\nnonstandard contributions of the top-Yukawa coupling and heavy colored fermions\nother than the top quark. In order to estimate the contribution of colorons, we\nderive the low-energy effective theory by eliminating colorons by using the\nequation of motion for colorons. We replace the composite operator (\\bar{q}_L\nt_R)(\\bar{t}_R q_L) in the effective theory by the composite Higgs operator. We\nthen obtain the effective gluon-gluon-Higgs (ggH-) operator induced by colorons\nand find that its coefficient (A_{col}) is proportional to m_{dyn}^2/M^2, where\nM and m_{dyn} denote the coloron mass and the mass dynamically generated by\ncolorons, respectively. The contribution of colorons A_{col} becomes comparable\nto the top-loop effect A_{top} for M=O(1TeV) and m_{dyn}=O(0.6TeV). Such a\nlarge dynamical mass can be realized in top-seesaw (TSS) models consistently\nwith the experimental value of the top quark mass (m_t^{exp}), while the\ndynamical mass itself is adjusted to m_t^{exp} in topcolor assisted technicolor\nmodels (TC2). We find that the coloron contribution A_{col} can be sizable in a\ncertain class of TSS models: the contribution of colorons (the top-loop) is\ndominant in the real (imaginary) part of the H->gg amplitude for the Higgs\nboson mass m_H of the order of 1 TeV. On the other hand, enhancement of the\ntop-Yukawa coupling becomes important in TC2. We can observe signatures of the\nHiggs boson in TC2 with m_H \\sim 200 GeV even at the Tevatron Run II as well as\nat the LHC. We estimate S/\\sqrt{B}=3-6 for an integrated luminosity of 2\nfb^{-1} and m_H=190 GeV at the Tevatron Run II.", "positive": "Light Neutralino Dark Matter: Direct/Indirect Detection and Collider\n Searches: We study the neutralino being the Lightest Supersymmetric Particle (LSP) as a\ncold Dark Matter (DM) candidate with a mass less than 40 GeV in the framework\nof the Next-to-Minimal-Supersymmetric-Standard-Model (NMSSM). We find that with\nthe current collider constraints from LEP, the Tevatron and the LHC, there are\nthree types of light DM solutions consistent with the direct/indirect searches\nas well as the relic abundance considerations: (i) A1, H1-funnels, (ii) stau\ncoannihilation and (iii) sbottom coannihilation. Type-(i) may take place in any\ntheory with a light scalar (or pseudo-scalar) near the LSP pair threshold;\nwhile Type-(ii) and (iii) could occur in the framework of\nMinimal-Supersymmetric-Standard-Model (MSSM) as well. We present a\ncomprehensive study on the properties of these solutions and point out their\nimmediate relevance to the experiments of the underground direct detection such\nas superCDMS and LUX/LZ, and the astro-physical indirect search such as\nFermi-LAT. We also find that the decays of the SM-like Higgs boson may be\nmodified appreciably and the new decay channels to the light SUSY particles may\nbe sizable. The new light CP-even and CP-odd Higgs bosons will decay to a pair\nof LSPs as well as other observable final states, leading to interesting new\nHiggs phenomenology at colliders. For the light sfermion searches, the signals\nwould be very challenging to observe at the LHC given the current bounds.\nHowever, a high energy and high luminosity lepton collider, such as the ILC,\nwould be able to fully cover these scenarios by searching for events with large\nmissing energy plus charged tracks or displaced vertices." }, { "anchor": "$b\\to cl\u03bd$ anomalies in light of vector and scalar interactions: We perform a model independent analysis of the charged current $b\\to cl\\nu$\nanomalies under the presence of scalar and vector interactions. The analysis is\ncarried out in two stages: (a) under the presence of both (left-handed) vector\nand scalar interactions and (b) under the presence of scalar interactions\nalone. We find that even after stringent bounds from similar quark-level\nprocesses such as $B_c\\to\\tau\\nu$, such scenarios have the potential to explain\nthe aforementioned anomalies. Contrary to the general notion, we show that even\nscalar interactions alone can explain such anomalies, provided they are\ncomplex. However, extended scalar sector models are unable to comply with these\nanomalies to $\\sim 3\\sigma$. We further illustrate our results with the help of\nthree benchmark models corresponding to the presence of (i) both scalar and\nvector (ii) real scalar and (iii) complex scalar interactions.", "positive": "Updates of PDFs in the MSTW framework: I present results on updates on PDFs which are obtained within the general\nframework which led to the MSTW2008 PDF sets. There are some theory and\nprocedural improvements and a variety of new data sets, including many relevant\nup-to-date LHC data. A new set of PDFs is very close to being finalised, with\nno significant changes expected to the preliminary PDFs shown here." }, { "anchor": "Non-Decoupling MSSM Higgs Sector and Light Superpartners: In the ``non-decoupling'' region of the Higgs sector in MSSM, the heavier\nCP-even Higgs boson (H^0) is Standard-Model-like and close to the charged Higgs\nbosons (H^\\pm) in mass, while other neutral Higgs bosons (h^0,A^0) are lighter\nand near the Z mass. This scenario is consistent with the current Higgs search\nlimits, although the improved sensitivity for a light charged Higgs boson\nsearch t -> H^+ b may result in certain degree of tension. We demonstrate that\nit can pass the stringent flavor constraints, provided there are other light\nSUSY particles to contribute in the loop induced processes. In turn, the\nnon-decoupling Higgs sector implies the existence of light (left-handed) stop,\nsbottom and Wino-like gauginos, with mass all below 250 GeV. These light\nsuper-partners can still escape the current SUSY searches at the LHC. Dedicated\nsearches for soft decay products should be devised for the LHC experiments to\nimprove the searching sensitivity. The ILC would be able to cover the full\nspectrum region. The solutions for the viable SUSY parameters result from\nsubtle cancellations and are often missed by the generic multiple dimensional\nscans, highlighting the importance of theoretical guidance in search for such\nspecial cases.", "positive": "Coupling constants of bottom (charmed) mesons with pion from three point\n QCD sum rules: In this article, the three point QCD sum rules is used to compute the strong\ncoupling constants of vertices containing the strange bottomed ( charmed )\nmesons with pion. The coupling constants are calculated, when both the bottom (\ncharm ) and pion states are off-shell. A comparison of the obtained results of\ncoupling constants with the existing predictions is also made. Key words:\nstrong coupling constant, meson, QCD sum rules, bottom, charm." }, { "anchor": "Survival of charmonia in a hot environment: A colorless c-cbar dipole emerging from a heavy ion collision and developing\nthe charmonium wave function can be broken-up by final state interactions (FSI)\npropagating through the hot medium created in the collision. We single out two\nmechanisms of charmonium attenuation: (i) Debye color screening, called\nmelting; and (ii) color-exchange interaction with the medium, called\nabsorption. The former problem has been treated so far only for charmonia at\nrest embedded in the medium, while in practice their transverse momenta at the\nLHC are quite high, =7-10 GeV^2. We demonstrate that a c-cbar dipole may\nhave a large survival probability even at infinitely high temperature. We\ndevelop a procedure of Lorentz boosting of the Schroedinger equation to a\nmoving reference frame and perform the first realistic calculations of the\ncharmonium survival probability employing the path-integral technique,\nincorporating both melting and absorption. These effects are found to have\ncomparable magnitudes. We also calculated the FSI suppression factor for the\nradial excitation psi(2S) and found it to be stronger than for J/psi, except\nlarge p_T, where psi(2S) is relatively enhanced. The azimuthal asymmetry\nparameter v_2 is also calculated.", "positive": "Anomalous dimensions from Yukawa couplings in SMNEFT: four-fermion\n operators: The Standard Model Neutrino Effective Field Theory (SMNEFT) is the Standard\nModel Effective Field Theory (SMEFT) augmented with right-handed neutrinos.\nBuilding on our previous work, arXiv:2010.12109, we calculate the Yukawa\ncoupling contributions to the one-loop anomalous dimension matrix for the 11\ndimension-six four-fermion SMNEFT operators. We also present the new\ncontributions to the anomalous dimension matrix for the 14 four-fermion SMEFT\noperators that mix with the SMNEFT operators through the Yukawa couplings of\nthe right-handed neutrinos." }, { "anchor": "Simple mass relations for bulk fermions: Relations between bulk mass parameters for fermions propagating in higher\ndimensions are studied in analogy with the empirical mass relation for charged\nleptons. Masses of three generation of four-dimensional charged leptons are\nachieved from the bulk mass parameters of the same-order values. We find that\nthe observed pattern of charged lepton mass spectrum is accommodated\napproximately in a set of simple relations for bulk and physical masses.", "positive": "One-loop corrections, uncertainties and approximations in neutralino\n annihilations: Examples: The extracted value of the relic density has reached the few per-cent level\nprecision. One can therefore no longer content oneself with calculations of\nthis observable where the annihilation processes are computed at tree-level,\nespecially in supersymmetry where radiative corrections are usually large.\nImplementing full one-loop corrections to all annihilation processes that would\nbe needed in a scan over parameters is a daunting task. On the other hand one\nmay ask whether the bulk of the corrections are taken into account through\neffective couplings of the neutralino that improve the tree-level calculation\nand would be easy to implement. We address this issue by concentrating in this\nfirst study on the neutralino coupling to i) fermions and sfermions and ii) Z.\nAfter constructing the effective couplings we compare their efficiency compared\nto the full one-loop calculation and comment on the failures and success of the\napproach. As a bonus we point out that large non decoupling effects of heavy\nsfermions could in principle be measured in the annihilation process, a point\nof interest in view of the latest limit on the squark masses from the LHC. We\nalso comment on the scheme dependencies of the one-loop corrected results." }, { "anchor": "Generalized eikonal identities for charged currents: We discuss QED radiative corrections to contact operators coupling two heavy\nfields and one light field. New eikonal identities are derived in the static\nlimit that demonstrate the equivalence of a class of ladder graphs to an\nequivalent theory with a single heavy-light vertex and a background Coulomb\nfield which communicates exclusively with the light field. We apply these new\nidentities to nuclear beta decays and demonstrates that the \"independent\nparticle model\" used by Jaus, Rasche, Sirlin \\& Zucchini is closely related,\nthough not identical, to a model independent EFT calculation.", "positive": "Threshold anomalies of ultra-high energy cosmic photons due to Lorentz\n invariance violation: From special relativity, photon annihilation process\n\\HepProcess{{\\Pgg}{\\Pgg}{\\to}{\\Pep}{\\Pem}} prevents cosmic photons with\nenergies above a threshold to propagate a long distance in cosmic space due to\ntheir annihilation with low energy cosmic background photons. However,\nmodifications of the photon dispersion relation from Lorentz invariance\nviolation~(LIV) can cause novel phenomena beyond special relativity to happen.\nIn this paper, we point out that these phenomena include optical transparency,\nthreshold reduction and reappearance of ultra-high energy photons in cosmic\nspace. The recent observation of near and above PeV photon events by the LHAASO\nCollaboration reveals the necessity to consider the threshold anomalies. Future\nobservations of above threshold photons from extragalactic sources can testify\nLIV properties of photons." }, { "anchor": "SU(2) Family Symmetry and the Supersymmetric Spectrum: We present a supersymmetric extension of the Standard Model with a gauged\nSU(2) family symmetry for the leptons. It is shown that this family symmetry\ncan be consistently broken at the TeV scale along with supersymmetry. If\nsupersymmetry breaking is driven by anomaly mediation, this model can provide\npositive squared masses for the sleptons and thus cure the tachyon problem. We\nanalyze the constraints and consequences of this scenario. A characteristic\nfeature of this model is the non-degeneracy of the first two family sleptons.\nThe model predicts large value of tan(beta) and observable \\tau to e \\gamma and\nB to \\mu^+ \\mu^- decay rates.", "positive": "Neutral meson properties in hot and magnetized quark matter: a new\n magnetic field independent regularization scheme applied to NJL-type model: A magnetic field independent regularization scheme (zMFIR) based on the\nHurwitz-Riemann zeta function is introduced. The new technique is applied to\nthe regularization of the mean-field thermodynamic potential and mass gap\nequation within the SU(2) Nambu-Jona-Lasinio model in a hot and magnetized\nmedium. The equivalence of the new and the standard MFIR scheme is\ndemonstrated. The neutral meson pole mass is calculated in a hot and magnetized\nmedium and the advantages of using the new regularization scheme are shown." }, { "anchor": "Critical QCD in Nuclear Collisions: A detailed study of correlated scalars, produced in collisions of nuclei and\nassociated with the $\\sigma$-field fluctuations, $(\\delta \\sigma)^2= < \\sigma^2\n>$, at the QCD critical point (critical fluctuations), is performed on the\nbasis of a critical event generator (Critical Monte-Carlo) developed in our\nprevious work. The aim of this analysis is to reveal suitable observables of\ncritical QCD in the multiparticle environment of simulated events and select\nappropriate signatures of the critical point, associated with new and strong\neffects in nuclear collisions.", "positive": "Hadronic contribution to $\u03b1(M_Z^2)$ and the anomalous magnetic\n moment of the muon: In this contribution recent developments are discussed which lead to a\nsignificant reduction of the error for $\\alpha(M_Z^2)$ and $(g-2)_\\mu$." }, { "anchor": "Enhanced neutrino signals from dark matter annihilation in the Sun via\n metastable mediators: We calculate the neutrino signal resulting from annihilation of secluded dark\nmatter in the Sun. In this class of models, dark matter annihilates first into\nmetastable mediators, which subsequently decay into Standard Model particles.\nIf the mediators are long lived, they will propagate out from the dense solar\ncore before decaying. High energy neutrinos undergo absorption in the Sun. In\nthe standard scenario in which neutrinos are produced directly in the centre of\nthe Sun, absorption is relevant for E > 100 GeV, resulting in a significant\nsuppression of the neutrino spectrum beyond E ~ 1 TeV. In the secluded dark\nmatter scenario, the neutrino signal is greatly enhanced because neutrinos are\ninjected away from the core, at lower density. Since the solar density falls\nexponentially with radius, metastable mediators have a significant effect on\nthe neutrino flux, even for decay lengths which are small compared to the solar\nradius. Moreover, since neutrino detection cross sections grow with energy,\nthis enhancement of the high energy region of the neutrino spectrum would have\na large effect on overall event rates.", "positive": "$SU(3)_c\\otimes SU(3)_L\\otimes U(1)_X$ as an $E_6$ Subgroup: An extension of the Standard Model to the local gauge group $SU(3)_c\\otimes\nSU(3)_L\\otimes U(1)_X$ which is a subgroup of the electroweak-strong\nunification group $E_6$ is analyzed. The mass scales, the gauge boson masses,\nand the masses for the spin 1/2 particles in the model are calculated. The mass\ndifferences between the up and down quark sectors, between the quarks and\nleptons, and between the charged and neutral leptons in one family are\nexplained as a consequence of mixing of ordinary with exotic fermions implied\nby the model. By using experimental results we constrain the mixing angle\nbetween the two neutral currents and the mass of the additional neutral gauge\nboson to be $-0.0015 \\leq \\sin\\theta \\leq 0.0048$ and $600 GeV \\leq M_{Z_2}$ at\n95% CL. The existence of a Dirac neutrino for each family with a mass of the\norder of the electroweak mass scale is predicted." }, { "anchor": "Early kinetic decoupling effect on the forbidden dark matter\n annihilations into standard model particles: The early kinetic decoupling (eKD) effect is an inevitable ingredient in\ncalculating the relic density of dark matter (DM) for various well-motivated\nscenarios. It appears naturally in forbidden dark matter annihilation, the main\nfocus of this work, which contains fermionic DM and a light singlet scalar that\nconnects the DM and standard model (SM) leptons. The strong suppression of the\nscattering between DM and SM particles happens quite early in the DM depletion\nhistory, where the DM temperature drops away from the thermal equilibrium,\n$T_\\chi < T_{\\rm SM}$, leading to the decreased kinetic energy of DM. The\nforbidden annihilation thus becomes inefficient since small kinetic energy\ncannot help exceed the annihilation threshold, naturally leading to a larger\nabundance. To show the eKD discrepancy, we numerically solve the coupled\nBoltzmann equations that govern the evolution of DM number density and\ntemperature. It is found that eKD significantly affects the DM abundance,\nresulting in almost an order of magnitude higher than that by the traditional\ncalculation. We also discuss the constraints from experimental searches on the\nmodel parameters, where the viable parameter space shrinks when considering the\neKD effect.", "positive": "A Hybrid Renormalization Scheme for Quasi Light-Front Correlations in\n Large-Momentum Effective Theory: In large-momentum effective theory (LaMET), calculating parton physics starts\nfrom calculating coordinate-space-$z$ correlation functions $\\tilde h(z,\na,P^z)$ in a hadron of momentum $P^z$ in lattice QCD. Such correlation\nfunctions involve both linear and logarithmic divergences in lattice spacing\n$a$, and thus need to be properly renormalized. We introduce a hybrid\nrenormalization procedure to match these lattice correlations to those in the\ncontinuum $\\overline{\\rm MS}$ scheme, without introducing extra\nnon-perturbative effects at large $z$. We analyze the effect of ${\\cal\nO}(\\Lambda_{\\rm QCD})$ ambiguity in the Wilson line self-energy subtraction\ninvolved in this hybrid scheme. To obtain the momentum-space distributions, we\nrecommend to extrapolate the lattice data to the asymptotic $z$-region using\nthe generic properties of the coordinate space correlations at moderate and\nlarge $P^z$, respectively." }, { "anchor": "Dispersion relation formalism for virtual Compton scattering and the\n generalized polarizabilities of the nucleon: A dispersion relation formalism for the virtual Compton scattering (VCS)\nreaction on the proton is presented, which for the first time allows a\ndispersive evaluation of 4 generalized polarizabilities at a four-momentum\ntransfer $Q^2 \\leq$ 0.5 GeV$^2$. The dispersive integrals are calculated using\na state-of-the-art pion photo- and electroproduction analysis. The dispersion\nformalism provides a new tool to analyze VCS experiments above pion threshold,\nthus increasing the sensitivity to the generalized polarizabilities of the\nnucleon.", "positive": "A numerical approach to infrared divergent multi-parton phase space\n integrals: It is described how the method of sector decomposition can serve to\ndisentangle overlapping infrared singularities, in particular those occurring\nin the calculation of the real emission part of e+e- to 2 jets and e+e- to 3\njets at NNLO." }, { "anchor": "Analysis of $K^+ \\to e^+ \u03bd_{e}\u03b3$ in light-front quark model and\n chiral perturbation theory of order $p^6$: Within the frameworks of the light-front quark model (LFQM) and chiral\nperturbation theory (ChPT) of $O(p^6)$, we reevaluate the form factors of the\n$K^+ \\to \\gamma$ transition. We use these form factors to study the decay of\n$K^+ \\to e^+ \\nu_{e}\\gamma$, which is dominated by the structure dependent\ncontribution. We show the differential decay branching ratio as a function of\n$x=2E_\\gamma/m_K$, where $E_\\gamma$ ($m_K$) is the photon energy (kaon mass).\nExplicitly, we find that, in the standard model with the cut of $x=0.01$ (0.1),\nthe decay branching ratio of $K^+ \\to e^+ \\nu_{e}\\gamma$ is $1.54 (1.44)\\times\n10^{-5}$ and $1.57 (1.47)\\times 10^{-5}$ in the LFQM and ChPT, respectively.", "positive": "Confining but chirally symmetric quarkyonic matter: Here we overview a possible mechanism for confining but chirally symmetric\nmatter at low temperatures and large densities." }, { "anchor": "Critical Opalescence in Baryonic QCD Matter: We show that critical opalescence, a clear signature of second-order phase\ntransition in conventional matter, manifests itself as critical intermittency\nin QCD matter produced in experiments with nuclei. This behaviour is revealed\nin transverse momentum spectra as a pattern of power laws in factorial moments,\nto all orders, associated with baryon production. This phenomenon together with\na similar effect in the isoscalar sector of pions (sigma mode) provide us with\na set of observables associated with the search for the QCD critical point in\nexperiments with nuclei at high energies.", "positive": "QCD Corrections to W Pair Production at LEP200: One loop QCD corrections to hadronic W decay are calculated for arbitrary W\npolarizations . The results are applied to W pair production and decay at\nLEP200. We focus on the corrections to angular distributions with particular\nemphasis on azimuthal distributions and correlations. The relevance of our\nresults to the experimental determination of possible nonstandard triple gauge\nbosons interactions is discussed." }, { "anchor": "Measuring rare and exclusive Higgs boson decays into light resonances: We evaluate the LHC's potential of observing Higgs boson decays into light\nelementary or composite resonances through their hadronic decay channels. We\nfocus on the Higgs boson production processes with the largest cross sections,\n$pp\\to h$ and $pp\\to h+\\mathrm{jet}$, with subsequent decays $h \\to ZA$ or\n$h\\to Z\\,\\eta_c$, and comment on the production process $pp\\to hZ$. By\nexploiting track-based jet substructure observables and extrapolating to\n$3000~\\mathrm{fb}^{-1}$ we find ${\\cal BR}(h \\to ZA) \\simeq {\\cal BR}(h \\to Z\n\\eta_c) \\lesssim 0.02$ at 95% CL. We interpret this limit in terms of the 2HDM\nType 1. We find that searches for $h\\to ZA$ are complementary to existing\nmeasurements and can constrain large parts of the currently allowed parameter\nspace.", "positive": "Pathways to testable leptogenesis: In the conventional seesaw models of neutrino masses, leptogenesis occurs at\na very high scale. Three approaches have been discussed in the literature to\nlower the scale of leptogenesis: mass degeneracy, hierarchy of couplings and\nthree-body decays. We advocate yet another approach to a testable leptogenesis,\nwhereby the decaying particles could go out of equilibrium at an accessible\nscale due to kinematics, although their couplings to the decay products are\nlarger for generating a desired CP asymmetry. We demonstrate this new\npossibility for the testable leptogenesis in a two Higgs doublet model where\nthe neutrino masses originate from a one-loop diagram." }, { "anchor": "Sum rule for rate and CP asymmetry in $B^+\\to K^+\u03c0^0$: A sum rule relating the ratio $R_c = 2 \\Gamma(B^+ \\to K^+ \\pi^0)/\\Gamma(B^+\n\\to K^0 \\pi^+)$ and the CP asymmetry $A_{CP}(B^+ \\to K^+\\pi^0)$ is proved to\nfirst order in the ratio of tree to penguin amplitudes. The sum rule explains\nwhy it is possible to have $R_c$ consistent with 1 together with a small CP\nasymmetry in $B^+ \\to K^+ \\pi^0$. The measured ratio $A_{CP}(B^+\\to\nK^+\\pi^0)/A_{CP}(B^0\\to K^+\\pi^-)$ rules out a small strong phase difference\nbetween a color-suppressed and a color-favored tree amplitude contributing to\n$B^+\\to K^+\\pi^0$ as favored by QCD factorization.", "positive": "Particle production in p-p collisions and prediction for LHC energy: We analyze recent data on particle production yields obtained in p-p\ncollisions at SPS and RHIC energies within the statistical model. We apply the\nmodel formulated in the canonical ensemble and focus on strange particle\nproduction. We introduce different methods to account for strangeness\nsuppression effects and discuss their phenomenological verification. We show\nthat at RHIC the midrapidity data on strange and multistrange particle\nmultiplicity can be successfully described by the canonical statistical model\nwith and without an extra suppression effects. On the other hand, SPS data\nintegrated over the full phase-space require an additional strangeness\nsuppression factor that is beyond the conventional canonical model. This factor\nis quantified by the strangeness saturation parameter or strangeness\ncorrelation volume. Extrapolating all relevant thermal parameters from SPS and\nRHIC to LHC energy we present predictions of the statistical model for particle\nyields in p-p collisions at sqrt(s) = 14TeV. We discuss the role and the\ninfluence of a strangeness correlation volume on particle production in p-p\ncollisions at LHC." }, { "anchor": "Charming Baryons: We study odd-parity baryonic resonances with one heavy and three light\nflavors, dynamically generated by meson-baryon interactions. Special attention\nis paid to Heavy Quark Spin Symmetry (HQSS), hence pseudoscalar and vector\nmesons and baryons with J^P = 1/2+ and 3/2+ are considered as constituent\nhadrons. For the hidden-charm sector (N-c-quarks = N-c-antiquarks = 1), the\nmeson-baryon Lagrangian with Heavy Flavor Symmetry is constructed by a minimal\nextension of the SU(3) Weinberg-Tomozawa (WT) Lagrangian to fulfill HQSS, such\nthat not new parameters are needed. This interaction can be presented in\ndifferent formal ways: as a Field Lagrangian, as Hadron creation-annihilation\noperators, as SU(6)xHQSS group projectors and as multichannel matrices. The\nmultichannel Bethe-Salpeter equation is solved for odd-parity light baryons,\nhidden-charm N and Delta and Beauty Baryons (Lambda-b). Results of calculations\nwith this model are shown in comparison with other models and experimental\nvalues for baryonic resonances.", "positive": "Higgs Boson Production in Association with Bottom Quarks: In the Standard Model, the coupling of the Higgs boson to b quarks is weak,\nleading to small cross sections for producing a Higgs boson in association with\nb quarks. However, Higgs bosons with enhanced couplings to b quarks, such as\noccur in supersymmetric models for large values of tan beta, will be copiously\nproduced at both the Tevatron and the LHC in association with b quarks, which\nwill be an important discovery channel. We investigate the connections between\nthe production channels, bg -> bh and gg ->b bbar h, at next-to-leading order\n(NLO) in perturbative QCD and present results for the cases with two high p_T b\njets and with one high p_T b jet at both the Tevatron the the LHC. Finally, the\ntotal cross sections without cuts are compared between gg -> b bbar h at NLO\nand b bbar ->h at NNLO." }, { "anchor": "On Renormalons and Landau Poles in Gauge Field Theories: It is shown that the commonly accepted relationship between the Landau\nsingularity in the running coupling constant of QED or QCD and the renormalon\nsingularities in the Borel sums of perturbation theory expansions is only a\nparticular feature of the restriction of the perturbative $\\beta$--function to\nthe one loop level.", "positive": "Stop and Sbottom Phenomenology in the MSSM: The first chapter serves as an introduction to the MSSM. I briefly review the\nmodel and explain why stops and sbottoms provide an interesting playground for\nexploring and testing this model. In the second chapter I discuss stop and\nsbottom production at lepton colliders. I give the analytical formulae for the\nproduction cross sections at e+e- and mu+mu- colliders including (general) beam\npolarization. A numerical analysis shows the cross sections that can be\nexpected at LEP2, an e+e- Linear Collider, and a Muon Collider. In particular,\nI address the topics of what can be gained by using polarized beams and how one\ncan determine the MSSM parameters by cross section measurements. The third\nchapter is devoted to stop and sbottom decays including 1-loop SUSY-QCD\ncorrections. The calculations are done in the on-shell renormalization scheme\nusing dimensional reduction. I present the analytical formulae for the\n\\order(alpha_s) corrected decay widths and explain the subtleties that have to\nbe taken into account in the calculations. Moreover, I perform a detailed\nnumerical analysis of squark decay widths and branching ratios at tree level\nand \\order(alpha_s)." }, { "anchor": "Inclusive Semi-leptonic B Decays to order 1/m_b^4: We give a systematic way to compute higher orders in the 1/m_b expansion in\ninclusive semi-leptonic decays at tree level. We reproduce the known 1/m_b^3\nterms and compute the 1/m_b^4 terms at tree level. The appearing\nnon-perturbative parameters and the impact on the determination of V_{cb} are\ndiscussed.", "positive": "Cosmology of the DFSZ axino: We study the cosmological impact of the supersymmetric DFSZ axion model.\nExtending recent works, we first provide a comprehensive analysis of thermal\nproduction of the DFSZ axino considering all the possible scattering, decay and\ninverse decay processes depending on various mass parameters and the reheat\ntemperature. Although it is hard for the DFSZ axino to be in thermal\nequilibrium, its coupling is still large enough to generate huge axino\npopulation which can turn into overabundant neutralino density. We examine the\nneutralino parameter space to identify the dark matter property depending on\nthe Peccei-Quinn scale. As the Peccei-Quinn scale becomes higher resulting in\nlonger axino lifetime, the neutralino dark matter appears in a lighter\nHiggsino-like LSP region or a more restricted Bino-like LSP region allowing a\nresonant annihilation through a CP-odd Higgs boson to meet stronger\nreannihilation." }, { "anchor": "Vacuum self-focussing of very intense laser beams: We argue that long-range photon-photon attraction induced by the dipole\ninteraction of two electron-positron loops can lead to \"vacuum self-focussing\"\nof very intense laser beams. The focussing angle theta(F) is found to increase\nwith the beam intensity I as theta(F) I^(4/3); for the laser beams available at\npresent or in the near future, theta(F) 10^(-10)--10^(-7).", "positive": "Study of jet substructure modification by differential girth at the LHC: Jet substructure observables are crucial for exploring the effects of the\nhot, dense medium and differentiating between quark and gluon jets. In this\npaper, we investigate the modification of jet shape by calculating the\ndifferential girth at LHC energies, ranging from pp to Pb--Pb collisions. The\ndifferential girth distribution exhibits a wave-like pattern, which offers a\nbetter explanation for the radial spreading of jet energy and large-angle\nradiation effects. We fit the differential girth distribution with a sine wave\nfunction to obtain the amplitude, angular frequency, initial phase, and offset\ndistance parameters as a function of jet radius. The results clearly\ndifferentiate between pp and heavy-ion collisions, with varying dependencies on\ncentrality and collision energy. Our findings shed new light on the\nunderstanding of radial jet energy loss in the QGP (quark-gluon plasma) medium,\nand provide additional potential observables for measuring jet shape at the LHC\nin the future." }, { "anchor": "Anomalous Axion Interactions and Topological Currents in Dense Matter: Recently an effective Lagrangian for the interactions of photons,\nNambu-Goldstone bosons and superfluid phonons in dense quark matter has been\nderived using anomaly matching arguments. In this paper we illuminate the\nnature of certain anomalous terms in this Lagrangian by an explicit microscopic\ncalculation. We also generalize the corresponding construction to introduce the\naxion field. We derive an anomalous axion effective Lagrangian describing the\ninteractions of axions with photons and superfluid phonons in the dense matter\nbackground. This effective Lagrangian, among other things, implies that an\naxion current will be induced in the presence of magnetic field. We speculate\nthat this current may be responsible for the explanation of neutron star kicks.", "positive": "Strong decays of charmonium-like state Y(4230): Strong decays of the charmonium-like state $Y(4320)$ have been studied in the\nframework of the covariant confined quark model. The resonance $Y$ has been\ninterpreted as a four-quark state of the molecular type. We evaluate the\nhidden-charm decay width of $Y$ to a vector and a scalar, with the latter\ndecaying subsequently to a pair of charged pseudoscalar states. The strong\ndecay modes $Y \\!\\to\\! \\pi^{+}\\pi^{-}J/\\Psi$ and $Y \\!\\to\\! K^{+}K^{-} J/\\Psi$\nhave been studied by involving the scalar resonance state $f_0(980)$. We have\ncalculated the fractal widths of the related strong decays and the branching\nratio ${\\cal B}(Y \\!\\to\\! K^{+}K^{-} J/\\Psi)$ / ${\\cal B}(Y \\!\\to\\!\n\\pi^{+}\\pi^{-}J/\\Psi)$, recently determined by the BESIII collaboration. The\nestimated branching ratio and calculated fractal strong decay widths are in\ngood agreement with the latest experimental data, favoring the molecular\nrepresentation of the $Y(4320)$ state." }, { "anchor": "Flavorful Supersymmetry: Weak scale supersymmetry provides elegant solutions to many of the problems\nof the standard model, but it also generically gives rise to excessive flavor\nand CP violation. We show that if the mechanism that suppresses the Yukawa\ncouplings also suppresses flavor changing interactions in the supersymmetry\nbreaking parameters, essentially all the low energy flavor and CP constraints\ncan be satisfied. The standard assumption of flavor universality in the\nsupersymmetry breaking sector is not necessary. We study signatures of this\nframework at the LHC. The mass splitting among different generations of squarks\nand sleptons can be much larger than in conventional scenarios, and even the\nmass ordering can be changed. We find that there is a plausible scenario in\nwhich the NLSP is a long-lived right-handed selectron or smuon decaying into\nthe LSP gravitino. This leads to the spectacular signature of monochromatic\nelectrons or muons in a stopper detector, providing strong evidence for the\nframework.", "positive": "Constraining $\u03c4$-lepton dipole moments and gluon couplings at the LHC: We study the constraints that can be placed on anomalous $\\tau$-lepton\ncouplings at the LHC. We use an effective Lagrangian description for physics\nbeyond the standard model which contains the $\\tau$-lepton anomalous magnetic\nmoment, electric dipole moment and weak dipole moments in two operators of\ndimension six. We include in our study two additional operators of dimension\neight that directly couple the $\\tau$-leptons to gluons and are therefore\nenhanced at the LHC. We consider the two main effects from these couplings:\nmodifications to the Drell-Yan cross-section and to the $\\tau$-lepton pair\nproduction in association with a Higgs boson. We find that a measurement of the\nformer at the 14% level can produce constraints comparable to existing ones for\nthe anomalous dipole couplings; and that a bound on the latter at a sensitivity\nlevel of $500\\ \\sigma_{SM}$ or better would produce the best constraint on the\n$\\tau$-gluonic couplings." }, { "anchor": "LHC Physics Potential vs. Energy: Considerations for the 2011 Run: Parton luminosities are convenient for estimating how the physics potential\nof Large Hadron Collider experiments depends on the energy of the proton beams.\nI quantify the advantage of increasing the beam energy from 3.5 TeV to 4 TeV. I\npresent parton luminosities, ratios of parton luminosities, and contours of\nfixed parton luminosity for $gg$, $u\\bar{d}$, $qq$, and $gq$ interactions over\nthe energy range relevant to the Large Hadron Collider, along with example\nanalyses for specific processes. This note extends the analysis presented in\narXiv:0908.3660. Full-size figures are available as pdf files at\nhttp://lutece.fnal.gov/PartonLum11/", "positive": "Predictive Leptogenesis from Minimal Lepton Flavour Violation: A predictive Leptogenesis scenario is presented based on the Minimal Lepton\nFlavour Violation symmetry. In the realisation with three right-handed\nneutrinos transforming under the same flavour symmetry of the lepton\nelectroweak doublets, lepton masses and PMNS mixing parameters can be described\naccording to the current data, including a large Dirac CP phase. The observed\nmatter-antimatter asymmetry of the Universe can be achieved through\nLeptogenesis, with the CP asymmetry parameter $\\varepsilon$ described in terms\nof only lepton masses, mixings and phases, plus two real parameters of the\nlow-energy effective description. This is in contrast with the large majority\nof models present in the literature, where $\\varepsilon$ depends on several\nhigh-energy parameters, preventing a direct connection between low-energy\nobservables and the baryon to photon ratio today. Recovering the correct amount\nof baryon asymmetry in the Universe constrains the Majorana phases of the PMNS\nmatrix within specific ranges of values: clear predictions for the neutrinoless\ndouble beta decay emerge, representing a potential smoking gun for this\nframework." }, { "anchor": "Masses of Heavy Flavour mesons in a space with one finite\n extra-dimension: Motivated by the recent developments in stability of hydrogen atom in a space\nwith one finite extra-dimension,we consider that physical mesons are also\nstable in such a space and estimate their masses in a QCD inspired potential\nmodel. Our analysis suggests that a model of mesons with linear plus coulomb\npotential in a space with one finite extra-dimension of size very very less\nthan 10^{-18} m is compatible with the present experimental data of heavy\nflavour mesons.", "positive": "Strangeness enhancement in heavy ion collisions: We argue that the main features of baryon and anti-baryon enhancement\nobserved by the WA97 collaboration can be described using canonical formulation\nof strangeness conservation. Within this formulation strangeness enhancement\ncould be larger at lower collision energies." }, { "anchor": "Iso-curvature fluctuations through axion trapping by cosmic string wakes: We consider wake-like density fluctuations produced by cosmic strings at the\nquark-hadron transition in the early universe. We show that low momentum axions\nwhich are produced through the radiation from the axionic string at an earlier\nstage, may get trapped inside these wakes due to delayed hadronization in these\noverdense regions. As the interfaces, bordering the wakes, collapse, the axions\npick-up momentum from the walls and finally leave the wake regions. These\naxions thus can produce large scale iso-curvature fluctuations. We have\ncalculated the detailed profile of these axionic density fluctuations and\ndiscuss its astrophysical consequences.", "positive": "Hidden beauty molecules within the local hidden gauge approach and heavy\n quark spin symmetry: Using a coupled channel unitary approach, combining the heavy quark spin\nsymmetry and the dynamics of the local hidden gauge, we investigate the\nmeson-meson interaction with hidden beauty and obtain several new states. Both\nI=0 and I=1 states are analyzed and it is shown that in the I=1 sector, the\ninteractions are too weak to create any bound states within our framework. In\ntotal, we predict with confidence the existence of 6 bound states, and weakly\nbound 6 more possible states. The existence of these weakly bound states depend\non the influence of the coupled channel effects." }, { "anchor": "Extracting the Kaon Collins function from $e^+e^-$ hadron pair\n production data: The latest data released by the BaBar Collaboration on azimuthal correlations\nmeasured for pion-kaon and kaon-kaon pairs produced in $e^+e^-$ annihilations\nallow, for the first time, a direct extraction of the kaon Collins functions.\nThese functions are then used to compute the kaon Collins asymmetries in Semi\nInclusive Deep Inelastic Scattering processes, which result in good agreement\nwith the measurements performed by the HERMES and COMPASS Collaborations.", "positive": "Broad composite resonances and their signals at the LHC: We explore the possibility that the left-handed third generation quark\ndoublet $q_L$ is fully composite in composite Higgs models. The signature of\nthe model is the presence of broad spin-1 resonances strongly interacting with\nthe third generation quark doublet $q_L$. In this case, The $t\\bar{t}$\nresonance search channel is comparable in sensitivity to the di-lepton channel.\nIn addition, the same-sign di-lepton channel in the $t\\bar{t}\\rho$ associate\nproduction can probe the large $g_\\rho$ parameter space and complementary to\nthe Drell-Yan production channels." }, { "anchor": "Spin partners of the $Z_b(10610)$ and $Z_b(10650)$ revisited: We study the implications of the heavy-quark spin symmetry for the possible\nspin partners of the exotic states $Z_b(10610)$ and $Z_b(10650)$ in the\nspectrum of bottomonium. We formulate and solve numerically the coupled-channel\nequations for the $Z_b$ states that allow for a dynamical generation of these\nstates as hadronic molecules. The force includes short-range contact terms and\nthe one-pion exchange potential, both treated fully nonperturbatively. The\nstrength of the potential at leading order is fixed completely by the pole\npositions of the $Z_b$ states such that the mass and the most prominent\ncontributions to the width of the isovector heavy-quark spin partner states\n$W_{bJ}$ with the quantum numbers $J^{++}$ ($J=0,1,2$) come out as predictions.\nSince the accuracy of the present experimental data does not allow one to fix\nthe pole positions of the $Z_b$'s reliably enough, we also study the pole\ntrajectories of their spin partner states as functions of the $Z_b$ binding\nenergies. It is shown that, once the heavy-quark spin symmetry is broken by\nmeans of the physical $B$ and $B^*$ masses, especially the pion tensor force\nhas a significant impact on the location of the partner states clearly\ndemonstrating the need of a coupled-channel treatment of pion dynamics to\nunderstand the spin multiplet pattern of hadronic molecules.", "positive": "Supersymmetry Signals of Supercritical String Cosmology at the Large\n Hadron Collider: We investigate the minimal supergravity (mSUGRA) signals at the LHC in the\ncontext of supercritical string cosmology (SSC). In this theory, the presence\nof a time dependent dilaton provides us with a smoothly evolving dark energy\nand modifies the dark matter allowed region of the mSUGRA model with standard\ncosmology. Such a dilaton dilutes the supersymmetric dark matter density (of\nneutralinos) by a factor O(10) and consequently the regions with too much dark\nmatter in the standard scenario are allowed in the SSC. The final states\nexpected at the LHC in this scenario, unlike the standard scenario, consist of\nZ bosons, Higgs bosons, and/or high energy taus. We show how to characterize\nthese final states and determine the model parameters. Using these parameters,\nwe determine the dark matter content and the neutralino-proton cross section.\nAll these techniques can also be applied to determine model parameters in SSC\nmodels with different SUSY breaking scenarios." }, { "anchor": "The $\u03be(2220)$ Revistited: We calculated the decay widths of the $1^3F_2$ and $1^3F_4$ $s\\bar{s}$ mesons\nand compared them to the measured properties of the $\\xi(2220)$ (now known as\nthe $f_4(2220)$). Including previously neglected decay modes we found that the\nwidth of the $^3F_2$ state $s\\bar{s}$ meson is much larger than previously\nbelieved making this explanation unlikely. On the other hand the predicted\nwidth of the $^3F_4$ state, although broader than the observed width, is\nconsistent within the uncertainties of the model. This interpretation predicts\nlarge partial widths to $K K^*(892)$ and $K^*(892) K^*(892)$ final states which\nshould be looked for. A second possibility that would account for the different\nproperties of the $\\xi(2220)$ seen in different experiments is that two\nhadronic states exist at this mass. The first would be a broader $^3F_4$\n$s\\bar{s}$ state which is seen in hadron beam experiments while the second\nwould be a narrow state with high glue content seen in the gluon rich $J/\\psi$\nradiative decay. Further experimental results are needed to sort this out.", "positive": "Flavor Democracy and Type-II Seesaw Realization of Bilarge Neutrino\n Mixing: We generalize the democratic neutrino mixing Ansatz by incorporating the\ntype-II seesaw mechanism with S(3) flavor symmetry. We find that bilarge\nneutrino mixing can naturally appear if the flavor democracy contribution is\nstrongly suppressed due to significant cancellation between the conventional\nseesaw and triplet mass terms. Explicit S(3) symmetry breaking yields\nsuccessful neutrino phenomenology and various testable correlations between the\nneutrino mass and mixing parameters. Among the results are a normal neutrino\nmass ordering, $0.005 \\le |U_{e3}| \\le 0.057$, $1 - \\sin^2 2\\theta_{23} \\ge\n0.005$, positive $J_{\\rm CP}$ and moderate cancellation in the effective mass\nof the neutrinoless double beta decay." }, { "anchor": "Single top quark production via SUSY-QCD FCNC couplings at the CERN LHC\n in the unconstrained MSSM: We evaluate the $t\\bar{c}$ and $t\\bar{u}$ productions at the LHC within the\ngeneral unconstrained MSSM framework. We find that these single top quark\nproductions induced by SUSY-QCD FCNC couplings have remarkable cross sections\nfor favorable parameter values allowed by current low energy data, which can be\nas large as a few pb. Once large rates of the $t\\bar{c}$ and $t\\bar{u}$\nproductions are detected at the LHC, they may be induced by SUSY FCNC\ncouplings. We show that the precise measurement of single top quark production\ncross sections at the LHC is a powerful probe for the details of the SUSY FCNC\ncouplings.", "positive": "QED at Finite Temperature in the Coulomb Gauge: We argue that calculations in QED at finite temperature are more conveniently\ncarried out in the Coulomb gauge, in which only the physical photon degrees of\nfreedom play a rol and are thermalized. We derive the photon propagator in this\ngauge for real-time finite temperature calculations and show that the\nfour-fermion static Coulomb interaction that appears in the Lagrangian can be\naccounted for by suitably modifying the photon propagator. The Feynman rules of\nthe theory are written in a manifestly covariant form, although they depend on\nthe velocity 4-vector $u_\\mu$ of the background medium. As a first step in\nshowing the consistency and usefulness of this approach, we consider the\none-loop calculation of the electron self-energy $\\Sigma$. It is explicitly\nshown that the divergences that arise from the vacuum contribution to $\\Sigma$\nare independent of $u_\\mu$, which implies that the counter terms that must be\nincluded in the Lagrangian are the same as those in the vacuum." }, { "anchor": "Hadron production in elementary nucleon-nucleon reactions from low to\n ultra-relativistic energies: We study the hadron production in $p+p$, $p+n$ and $n+n$ reactions within the\nmicroscopic Parton-Hadron-Dynamics (PHSD) transport approach in comparison to\nPYTHIA 8.2. We discuss the details of the \"PHSD tune\" of the Lund string model\n(realized by event generators FRITIOF and PYTHIA) in the vacuum (as in $N+N$\ncollisions) as well as its in-medium modifications relevant for heavy-ion\ncollisions where a hot and dense matter is produced. We compare the results of\nPHSD and PYTHIA 8.2 (default version) for the excitation function of hadron\nmultiplicities as well as differential rapidity $y$, transverse momentum $p_T$\nand $x_F$ distributions in $p+p$, $p+n$ and $n+n$ reactions with the existing\nexperimental data in the energy range $\\sqrt{s_{NN}} = 2.7 - 7000$ GeV. We\ndiscuss the production mechanisms of hadrons and the role of final state\ninteractions (FSI) due to the hadronic rescattering. We also show the influence\nof the possible quark-gluon plasma (QGP) formation on hadronic observables in\n$p+p$ collisions at LHC energies. We stress the importance of developing a\nreliable event generator for elementary reactions from low to\nultra-relativistic energies in view of actual and upcoming heavy-ion\nexperiments.", "positive": "Neutrino Mass from Laboratory: Contribution of Double Beta Decay to the\n Neutrino Mass Matrix: Double beta decay is indispensable to solve the question of the neutrino mass\nmatrix together with $\\nu$ oscillation experiments. The most sensitive\nexperiment - since eight years the HEIDELBERG-MOSCOW experiment in Gran-Sasso -\nalready now, with the experimental limit of $ < 0.26$ eV practically\nexcludes degenerate $\\nu$ mass scenarios allowing neutrinos as hot dark matter\nin the universe for the smallangle MSW solution of the solar neutrino problem.\nIt probes cosmological models including hot dark matter already now on the\nlevel of future satellite experiments MAP and PLANCK. It further probes many\ntopics of beyond SM physics at the TeV scale. Future experiments should give\naccess to the multi-TeV range and complement on many ways the search for new\nphysics at future colliders like LHC and NLC. For neutrino physics some of them\n(GENIUS) will allow to test almost all neutrino mass scenarios allowed by the\npresent neutrino oscillation experiments." }, { "anchor": "Global Fits of the electroweak Standard Model and beyond with Gfitter: In the global fit of the Standard Model using Gfitter, electroweak precision\nobservables as well as constraints from direct Higgs searches have been\ncompared with state-of-the-art electroweak predictions. We use the most recent\nresults for direct Higgs searches at LEP and Tevatron and the latest\nmeasurements of m_t and M_W. Example results are an estimation of the mass of\nthe Higgs boson (M_H=116.3 +15.6 -1.3 GeV) and a forth-order result for the\nstrong coupling constant (alpha_S(M_Z^2)=0.1193 +-0.0028(exp) +-0.0001(theo)).\nA fit of the oblique parameters (STU) to the electroweak data is performed, in\norder to constrain physics beyond the Standard Model. For instance, the\nparameter space of the Littlest Higgs Model with T-parity can be restricted via\nthe oblique parameters. In addition, fit results for a model with an extended\nHiggs sector (2HDM) using mainly observables from the B and K physics are\npresented.", "positive": "Probing TeV scale Top-Philic Resonances with Boosted Top-Tagging at the\n High Luminosity LHC: We investigate the discovery potential of singly produced top-philic\nresonances at the high luminosity (HL) LHC in the four-top final state. Our\nanalysis spans over the fully-hadronic, semi-leptonic, and same-sign dilepton\nchannels where we present concrete search strategies adequate to a boosted\nkinematic regime and high jet-multiplicity environments. We utilize the\nTemplate Overlap Method (TOM) with newly developed template observables for\ntagging boosted top quarks, a large-radius jet variable $M_J$ and customized\nb-tagging tactics for background discrimination. Our results show that the\nsame-sign dilepton channel gives the best sensitivity among the considered\nchannels, with an improvement of significance up to 10%-20% when combined with\nboosted-top tagging. Both the fully-hadronic and semi-leptonic channels yield\ncomparable discovery potential and contribute to further enhancements in the\nsensitivity by combining all channels. Finally, we show the sensitivity of a\ntop-philic resonance at the LHC and HL-LHC by showing the $2\\sigma$ exclusion\nlimit and $5\\sigma$ discovery reach, including a combination of all three\nchannels." }, { "anchor": "CP Asymmetry in $\u03c4\\to K\u03c0\u03bd_\u03c4 $ within Non-Minimal $SU(5)$: Direct CP asymmetry in semi-leptonic $\\tau$ decays is an intriguing hint for\nnew physics beyond the standard model. We investigate the CP asymmetry in\n$\\tau^- \\to K_S^0 \\pi^- \\nu_\\tau$ and $\\tau^- \\to K^- \\pi^0 \\nu_\\tau$ decays in\nnon-minimal SU(5) model, with 45-dimensional Higgs multiplet. We show that the\nassociate color-triplet scalar is a natural example of a scalar leptoquark that\nmediates the transition $\\tau \\to s \\bar u \\nu_\\tau$, and accounts for the 2.8\n$\\sigma$ discrepancy between the $A_{\\rm CP}(\\tau^- \\to K_S^0 \\pi^- \\nu_\\tau)$\nexperimental results and the SM expectation. Furthermore, it predicts a sizable\n$A_{\\rm CP}(\\tau^- \\to K^- \\pi^0 \\nu_\\tau)$, of order ${\\cal O}(10^{-3})$,\nwhich can be accessible in current and near future experiments.", "positive": "A string landscape guide to soft SUSY breaking terms: We examine several issues pertaining to statistical predictivity of the\nstring theory landscape for weak scale supersymmetry (SUSY). We work within a\npredictive landscape wherein super-renormalizable terms scan while\nrenormalizable terms do not. We require stringy naturalness wherein the\nlikelihood of values for observables is proportional to their frequency within\na fertile patch of landscape including the MSSM as low energy effective theory\nwith a pocket-universe value for the weak scale nearby to its measured value in\nour universe. In the string theory landscape, it is reasonable that the soft\nterms enjoy a statistical power-law draw to large values, subject to the\nexistence of atoms as we know them (atomic principle). We argue that gaugino\nmasses, scalar masses and trilinear soft terms should each scan independently.\nIn addition, the various scalars should scan independently of each other unless\nprotected by some symmetry. The expected non-universality of scalar masses--\nonce regarded as an undesirable feature-- emerges as an asset within the\ncontext of the string landscape picture. In models such as heterotic\ncompactifications on Calabi-Yau manifolds, where the tree-level gauge kinetic\nfunction depends only on the dilaton, then gaugino masses may scale mildly,\nwhile scalar masses and A-terms, which depend on all the moduli, may scale much\nmore strongly leading to a landscape solution to the SUSY flavor and CP\nproblems in spite of non-diagonal K\\\"ahler metrics. We present numerical\nresults for Higgs and sparticle mass predictions from the landscape within the\ngeneralized mirage mediation SUSY model and discuss resulting consequences for\nLHC SUSY and WIMP dark matter searches." }, { "anchor": "A numerical method for NNLO calculations: A method to isolate the poles of dimensionally regulated multi-loop integrals\nand to calculate the pole coefficients numerically is extended to be applicable\nto phase space integrals as well.", "positive": "Small Angle Polarization in High Energy P--P Scattering Through\n Nonperturbative Chiral Symmetry Breaking: We show that a large anomalous contribution due to nonperturbative\ninstanton-like gluonic field configurations to the axial charge of the proton\nimplies high-energy spin effects in $p-p$ elastic scattering. This is the same\nmechanism which is responsible for anomalous baryon number violation at high\nenergy in the standard model. We compute the proton polarization due to these\neffects and we show that it is proportional to the center-of-mass scattering\nangle with a universal (energy-independent) slope of order unity." }, { "anchor": "Indirect search for supersymmetry in rare B decays: QCD corrections to the gluino induced contribution to b --> s gamma are shown\nto be important in order to extract reliable bounds on the off-diagonal\nelements of the squark mass matrices.", "positive": "A bound on the nucleon Druck-term from chiral EFT in curved space-time\n and mechanical stability conditions: Using dispersive representations of the nucleon gravitational form factors,\nthe results for their absorptive parts from chiral effective field theory in\ncurved space-time, and the mechanical stability conditions, we obtain a model\nindependent inequality for the value of the gravitational $D(t)$ form factor at\nzero momentum transfer (Druck-term). In particular, the obtained inequality\nleads to a conservative bound on the Druck-term in the chiral limit $D \\leq\n-0.95(9)$. This bound implies the restriction on the low-energy constant $c_8$\nof the effective chiral action for nucleons and pions in the presence of an\nexternal gravitational field,\n $c_8\\leq -1.1(1)$ GeV$^{-1}$. For the physical pion mass we obtain a model\nindependent bound $D\\leq -0.20(2)$." }, { "anchor": "Prospect for observing a light charged Higgs through the decay $H^+ \\to\n c \\bar{b} + c.c.$ at the LHeC: We study the production and decay of a light charged Higgs boson at the\nfuture Large Hadron electron Collider (LHeC) in the framework of the Two Higgs\nDoublet Type III, assuming a four-zero texture in the Yukawa matrices and a\ngeneral Higgs potential. We analyze the charge current production processes\n$e^- p \\to \\nu_e q H^+ $ considering the signature $H^+ \\to c \\bar{b} + c.c.$\nof the final state. We take this signature and we compare it to the irreducible\nbackground from Standard Model (SM) interactions. We consider scenarios of the\nmodel which are consistent with current experimental data from Higgs and flavor\nphysics.", "positive": "AdS gravity and glueball spectrum: The glueball spectrum has attracted much attention since the formulation of\nQuantum Chromodynamics. Different approaches give very different results for\ntheir masses. We revisit the problem from the perspective of the AdS/CFT\ncorrespondence." }, { "anchor": "The third type of fermion mixing in the lepton and quark interactions\n with leptoquarks: The low-energy manifestations of a minimal extension of the electroweak\nstandard model based on the quark-lepton symmetry $SU(4)_V \\otimes SU(2)_L\n\\otimes G_R$ of the Pati--Salam type are analyzed. Given this symmetry the\nthird type of mixing in the interactions of the $SU(4)_V$ leptoquarks with\nquarks and leptons is shown to be required. An additional arbitrariness of the\nmixing parameters could allow, in principle, to decrease noticeably the lower\nbound on the vector leptoquark mass originated from the low-energy rare\nprocesses, strongly suppressed in the standard model.", "positive": "The intensity dependent mass shift: existence, universality and\n detection: The electron mass shift in a laser field has long remained an elusive\nconcept. We show that the mass shift can exist in pulses but that it is neither\nunique nor universal: it can be reduced by pulse shaping. We show also that the\ndetection of mass shift effects in laser-particle scattering experiments is\nfeasible with current technology, even allowing for the transverse structure of\nrealistic beams." }, { "anchor": "Q ball Decay Rates into Gravitinos and Quarks: The Affleck-Dine mechanism, which is one of the most attractive candidates\nfor the baryogenesis in supersymmetric theories, often predicts the existence\nof baryonic Q balls in the early universe. In this scenario, there is a\npossibility to explain the observed baryon-to-dark matter ratio because Q balls\ndecay into supersymmetric particles as well as into quarks. If the gravitino\nmass is small compared to the typical interaction energy, the longitudinal\ncomponent of the gravitino behaves like the massless goldstino. We numerically\ncalculate the goldstino production rates from Q balls in the leading\nsemi-classical approximation without using large radius limit or effective\ncoupling. We also calculate the quark production rates from Q balls in the\nYukawa theory with a massive fermion. In deriving the decay rate we also take\ninto account the scalar field configuration of the Q ball. These results are\napplied to a realistic model in the gauge-mediated supersymmetry breaking and\nyield the branching ratio of the Q ball decay into the gravitino. We obtain the\nbranching ratio much smaller than the one estimated in the previous analysis.", "positive": "Soft evolution after a hard scattering process: The dynamical cascade of momentum, spin, charge, and other quantum numbers\nfrom an ultra-violet process into the infra-red is a fundamental concern for\nasymptotically free or conformal gauge field theories. It is also a practical\nconcern for any high energy scattering experiment with energies above tens of\nGeV. We present a formulation of the evolution equation that governs this\ncascade, the Banfi-Marchesini-Smye equation, from both an effective field\ntheory point of view and a direct diagrammatic argument. The equation uses\nexact momentum conservation, and is applicable to both scattering with initial\nand final state hard partons. The direct diagrammatic formulation is organized\nby constructing a generating functional. This functional is also automatically\nrealized with soft wilson lines and collinear field operators coupled to\nexternal currents. The two approaches are directly connected by reverse\nengineering the Lehman-Symanzik-Zimmermann reduction procedure to insert states\nwithin the soft and collinear matrix elements. At leading order, the cascade is\ncompletely controlled by the soft anomalous dimension. By decomposing the\nanomalous dimension into on-shell and off-shell regions as would be realized in\nthe effective field theory approach with a Glauber mediating potential, we are\nforced to choose a transverse momentum ordering in order to trivialize the\noverlap between Glauber potential contributions and the pure soft region. The\nevolution equation then naturally incorporates factorization violating effects\ndriven by off-shell exchanges for active partons. Finally, we examine the\nconsequences of abandoning exact momentum conservation as well as terminating\nthe evolution at the largest inclusive scale, procedures often used to simplify\nthe analysis of the cascade." }, { "anchor": "Beyond the rainbow: effects from pion back-coupling: We investigate hadronic unquenching effects in light quarks and mesons. To\nthis end we take into account the back-coupling of the pion onto the quark\npropagator within the non-perturbative continuum framework of Schwinger-Dyson\nequations (SDE) and Bethe-Salpeter equations (BSE). We improve on a previous\napproach by explicitly solving both the coupled system of DSEs and BSEs in the\ncomplex plane and the normalisation problem for Bethe-Salpeter kernels\ndepending on the total momentum of the meson. As a result of our study we find\nconsiderable unquenching effects in the spectrum of light pseudoscalar, vector\nand axial-vector mesons.", "positive": "Gluino LOSP with Axino LSP: In this letter we have presented a novel version of \"long-lived\" gluinos in\nsupersymmetric models with the gluino the lightest ordinary supersymmetric\nparticle [LOSP] and axino LSP. Within certain ranges of the axion decay\nconstant $f_a < 1 \\times 10^{10}$ GeV, the gluino mass bounds are reduced to\nless than 1000 GeV. The best limits can be obtained by looking for decaying\nR-hadrons in the detector where the gluino decays to a gluon and axino in the\ncalorimeters. SUSY models with a gluino LOSP can occur over a significant\nregion of parameter space in either {\\em mirage-mediation} or general\ngauge-mediated SUSY breaking models. The gluino LOSP is not constrained by\ncosmology, but in this scenario the axion/axino may be good dark matter\ncandidates." }, { "anchor": "Present and projected sensitivities of Dark Matter direct detection\n experiments to effective WIMP-nucleus couplings: Assuming for Weakly Interacting Massive Particles (WIMPs) a Maxwellian\nvelocity distribution in the Galaxy we explore in a systematic way the relative\nsensitivity of an extensive set of existing and projected Dark Matter (DM)\ndirect detection experiments to each of the 14 couplings that parameterize the\nmost general non-relativistic (NR) effective Hamiltonian allowed by Galilean\ninvariance for a contact interaction driving the elastic scattering off nuclei\nof WIMPs of spin 1/2. We perform our analysis in terms of two free parameters:\nthe WIMP mass $m_{\\chi}$ and the ratio between the WIMP-neutron and the\nWIMP-proton couplings $c^n/c^p$. We include the modified signal spectral shape\ndue to non-standard interactions when it is needed in the determination of the\nbound, such as in the case of background subtraction or of the application of\nthe optimal-interval method. For each coupling, in the $m_{\\chi}$-$c^n/c^p$\nplane we provide contour plots of the most stringent 90 % C.L. bound on the\nWIMP-nucleon cross section and show the experiment providing it. We also\nintroduce NRDD_constraints, a simple interpolating code written in Python that\nallows to obtain the numerical value of the bound as a function of the WIMP\nmass $m_{\\chi}$ and of the coupling ratio $c^n/c^p$ for each NR coupling. We\nfind that 9 experiments out of the 14 present Dark Matter searches considered\nin our analysis provide the most stringent bound on some of the effective\ncouplings for a given choice of $(m_{\\chi},c^n/c^p)$: this is evidence of the\ncomplementarity of different target nuclei and/or different combinations of\ncount-rates and energy thresholds when the search of DM is extended to a wide\nrange of possible interactions.", "positive": "QCD equation of state at nonzero magnetic fields in the Hadron Resonance\n Gas model: The Hadron Resonance Gas (HRG) model is considered to study the QCD equation\nof state for the case of nonzero external magnetic fields. Thermodynamic\nobservables including the pressure, energy density, entropy density,\nmagnetization and the speed of sound are presented as functions of the\ntemperature and the magnetic field. The magnetization is determined to be\npositive, indicating that the hadronic phase of QCD is paramagnetic. The\nbehavior of the speed of sound suggests that the deconfinement transition\ntemperature is lowered as the magnetic field grows. Moreover, a simple\ncorrespondence is derived, which relates the magnetic catalysis of the quark\ncondensate to the positivity of the beta-function in scalar QED." }, { "anchor": "Position space interpretation for generalized parton distributions: For an unpolarized target, the generalized parton distribution $H_q(x,0,t)$\nis related to the distribution of partons in impact parameter space. The\ntransverse distortion of this distribution for a transversely polarized target\nis described by $E_q(x,0,t)$.", "positive": "An Introduction to Spin Dependent Deep Inelastic Scattering: The main focus of these lectures is on those aspects of deep inelastic\nscattering that can be derived directly from QCD using quantum field theory,\nwithout recourse to phenomenological models. The emphasis is on spin dependent\nscattering, but the theory of spin averaged scattering is also discussed. A\ndetailed analysis is given for the case of spin 1/2 targets, with a brief\ndiscussion of higher spin targets at the end. The QCD derivation of the\nCallan-Gross relation, the longitudinal structure function $F_L$, and the\nBjorken and Ellis-Jaffe sum rules is presented. I also discuss the\nWilczek-Wandzura contribution to $g_2$, and why the Gottfried sum rule does not\nhold in QCD." }, { "anchor": "Operator Product Expansion in QCD Is Not Consistent With Quantum Field\n Theory For Gluon Distribution Function: Since the operator product expansion (OPE) is applicable at short distance\nthe OPE in QCD does not solve the long distance confinement problem involving\nhadron in QCD where the non-perturbative QCD is applicable. In this paper we\nshow that the gauge invariant definition of the non-perturbative gluon\ndistribution function inside the hadron consistent with the operator product\nexpansion (OPE) in QCD at high energy colliders is not consistent with the\ngauge invariant definition of the non-perturbative gluon distribution function\nin the quantum field theory.", "positive": "The nucleon mass and pion-nucleon sigma term from a chiral analysis of\n Nf=2 lattice QCD world data: We investigate the pion-mass dependence of the nucleon mass within the\ncovariant SU(2) baryon chiral perturbation theory up to order p4 with and\nwithout explicit Delta(1232) degrees of freedom. We fit lattice QCD data from\nseveral collaborations for 2 and 2+1 flavor ensembles. Here, we emphasize our\nNf=2 study where the inclusion the Delta(1232) contributions stabilizes the\nfits. We correct for finite volume and spacing effects, set independently the\nlattice QCD scale by a Sommer-scale of r0 = 0.493(23) fm and also include one\nsigma pi-N lQCD data point near Mpi = 290 MeV. We obtain low-energy constants\nof natural size which are compatible with the rather linear pion-mass\ndependence observed in lattice QCD. We report a value of 41(5)(4) MeV for the\nsigma pi-N term in the 2 flavor case and 52(3)(8) MeV in the 2+1 flavors case." }, { "anchor": "T-Odd Correlations in pi->e nu_e gamma and pi->mu nu_mu gamma Decays: The transverse lepton polarization asymmetry in pi_l2gamma decays may probe\nT-violating interactions beyond the Standard Model. Dalitz plot distributions\nof the expected effects are presented and compared to the contribution from the\nStandard Model final state interactions. We give an example of a\nphenomenologically viable model, where a considerable contribution to the\ntransverse lepton polarization asymmetry arises.", "positive": "Softly Broken A_4 Symmetry for Nearly Degenerate Neutrino Masses: The leptonic Higgs doublet model of neutrino masses is implemented with an\nA_4 discrete symmetry (the even permutation of 4 objects or equivalently the\nsymmetry of the tetrahedron) which has 4 irreducible representations: 1, 1',\n1'', and 3. The resulting spontaneous and soft breaking of A_4 provides a\nrealistic model of charged-lepton masses as well as a nearly degenerate\nneutrino mass matrix. Phenomenological consequences at and below the TeV scale\nare discussed." }, { "anchor": "Indirect Collider Tests for Large Extra Dimensions: We review the capability of colliders to detect the virtual exchange of\nKaluza-Klein towers of gravitons within the low scale quantum gravity scenario\nof Arkani-Hamed, Dimopoulos and Dvali.", "positive": "Neutrino Physics and the Mirror World: Improper Lorentz Transformations can be retained as exact symmetries of\nNature if the particle content and gauge group of the Standard Model are\ndoubled. The resulting ``Exact Parity Model (EPM)'' sees each ordinary particle\npaired with a mirror analogue. If neutrinos have mass and if they mix, then the\nEPM predicts that each ordinary neutrino will be maximally mixed with its\nmirror neutrino partner. This provides a very simple explanation for the very\nlarge mixing angle observed for atmospheric muon neutrinos by SuperKamiokande\nand other experiments. Maximal mixing for electron neutrinos is also well\nmotivated by the solar neutrino problem. If small interfamily mixing is\nswitched on, then the LSND anomaly can also be accomodated by the EPM. The EPM\nthus provides a unified, simple and to some extent predictive framework for\nexplaining all of the anomalous neutrino data. This talk will briefly review\nthe EPM or mirror neutrino scenario." }, { "anchor": "Effective lepton flavor violating $\\boldsymbol{H\\ell_i\\ell_j}$ vertex\n from right-handed neutrinos within the mass insertion approximation: In this work we present a new computation of the lepton flavor violating\nHiggs boson decays that are generated radiatively to one-loop from heavy\nright-handed neutrinos. We work within the context of the inverse seesaw model\nwith three $\\nu_R$ and three extra singlets $X$, but the results could be\ngeneralized to other low scale seesaw models. The novelty of our computation is\nthat it uses a completely different method by means of the mass insertion\napproximation which works with the electroweak interaction states instead of\nthe usual 9 physical neutrino mass eigenstates of the inverse seesaw model.\nThis method also allows us to write the analytical results explicitly in terms\nof the most relevant model parameters, that are the neutrino Yukawa coupling\nmatrix $Y_\\nu$ and the right-handed mass matrix $M_R$, which is very convenient\nfor a phenomenological analysis. This $Y_\\nu$ matrix, being generically\nnondiagonal in flavor space, is the only responsible for the induced charged\nlepton flavor violating processes of our interest. We perform the calculation\nof the decay amplitude up to order ${\\cal O}(Y_\\nu^2+Y_\\nu^4)$. We also study\nnumerically the goodness of the mass insertion approximation results. In the\nlast part we present the computation of the relevant one-loop effective vertex\n$H\\ell_i\\ell_j$ for the lepton flavor violating Higgs decay which is derived\nfrom a large $M_R$ mass expansion of the form factors. We believe that our\nsimple formula found for this effective vertex can be of interest for other\nresearchers who wish to estimate the $H \\to \\ell_i \\bar \\ell_j$ rates in a fast\nway in terms of their own preferred input values for the relevant model\nparameters $Y_\\nu$ and $M_R$.", "positive": "Observables sensitive to absolute neutrino masses. II: In this followup to Phys. Rev. D 75, 053001 (2007) [arXiv:hep-ph/0608060] we\nreport updated constraints on neutrino mass-mixing parameters, in light of\nrecent neutrino oscillation data (KamLAND, SNO, and MINOS) and cosmological\nobservations (WMAP 5-year and other data). We discuss their interplay with the\nfinal 0nu2beta decay results in 76-Ge claimed by part of the Heidelberg-Moscow\nCollaboration, using recent evaluations of the corresponding nuclear matrix\nelements, and their uncertainties. We also comment on the 0nu2beta limits in\n130-Te recently set by Cuoricino, and on prospective limits or signals from the\nKATRIN experiment." }, { "anchor": "Spontaneous Mirror Parity Violation, Common Origin of Matter and Dark\n Matter, and the LHC Signatures: Existence of a mirror world in the universe is a fundamental way to restore\nthe observed parity violation in weak interactions and provides the lightest\nmirror nucleon as a unique GeV-scale dark matter particle candidate. The\nvisible and mirror worlds share the same spacetime of the universe and are\nconnected by a unique space-inversion symmetry -- the mirror parity (P). We\nconjecture that the mirror parity is respected by the fundamental interaction\nLagrangian, and study its spontaneous breaking from minimizing the Higgs vacuum\npotential. The domain wall problem is resolved by a unique soft breaking\nlinear-term from the P-odd weak-singlet Higgs field. We also derive constraint\nfrom the Big-Bang nucleosynthesis. We then analyze the neutrino seesaw for both\nvisible and mirror worlds, and demonstrate that the desired amounts of visible\nmatter and mirror dark matter in the universe arise from a common origin of CP\nviolation in the neutrino sector via leptogenesis. We derive the Higgs\nmass-spectrum and Higgs couplings with gauge bosons and fermions. We show their\nconsistency with the direct Higgs searches and the indirect precision\nconstraints. We further study the distinctive signatures of the predicted\nnon-standard Higgs bosons at the LHC. Finally, we analyze the direct detections\nof GeV-scale mirror dark matter by TEXONO and CDEX experiments.", "positive": "Neutrino Mass Operators of Dimension up to Nine in Two-Higgs-doublet\n Model: We study higher-dimensional neutrino mass operators in a low energy theory\nthat contains a second Higgs doublet, the two Higgs doublet model. The\noperators are relevant to underlying theories in which the lowest\ndimension-five mass operators would not be induced. We list the independent\noperators with dimension up to nine with the help of Young tableau. Also listed\nare the lowest dimension seven operators that involve gauge bosons and violate\nthe lepton number by two units. We briefly mention some of possible\nphenomenological implications." }, { "anchor": "Signatures of the Yang-Mills deconfinement transition from the gluon\n two-point correlator: We evaluate the longitudinal or (chromo-)electric Yang-Mills gluon propagator\nin the recently proposed center-symmetric Landau gauge at finite temperature\n[1]. To model the effect of the Gribov copies in the infrared, we use the\nCurci-Ferrari model which, in turn, allows us to rely on perturbative\ncalculations. At one-loop order in the SU(2) case, the so-obtained longitudinal\ngluon propagator provides a clear signature for Z2 center-symmetry breaking\nwith a singular behavior, characteristic of a continuous phase transition. This\nis in sharp contrast with what is found within the standard Landau gauge. We\nalso identify various signatures for Z3 center-symmetry breaking in the SU(3)\ncase in the form of genuine order parameters. Among those, we find that the\ngluon propagator, although degenerate along the diagonal color directions in\nthe confining phase, becomes non-degenerate in the deconfined phase. Our\nresults open new ways of identifying the transition from correlation functions\nboth within continuum approaches and on the lattice.", "positive": "Dispersion of Ultra-Relativistic Tardyonic and Tachyonic Wave Packets on\n Cosmic Scales: We investigate the time propagation of tachyonic (superluminal) and tardyonic\n(subluminal, ordinary) massive wave packets on cosmic scales. A normalizable\nwave packet cannot be monochromatic in momentum space and thus acquires a\npositional uncertainty (or packet width) that increases with travel distance.\nWe investigate the question of how this positional uncertainty affects the\nuncertainty in the detection time for cosmic radiation on Earth. In the\nultrarelativistic limit, we find a unified result, $\\delta x(t)/c^3 = m^2\n\\delta p t /p_0^3$, where $\\delta x(t)$ is the positional uncertainty, $m$ is\nthe mass parameter, $\\delta p$ is the initial momentum spread of the wave\nfunction, and $p_0$ is the central momentum of the wave packet, which, in the\nultrarelativistic limit, is equal to its energy. This result is valid for\ntachyons and tardyons; its interpretation is being discussed." }, { "anchor": "Accurate predictions for top-quark pair production at the LHC: The top quark is the heaviest elementary particle in the Standard Model (SM).\nFor this reason, a precise determination of its mass $m_t$ is part of the LHC\nphysics program. The most accurate determinations of $m_t$ rely on the\nkinematic reconstruction of the top decay products and on the use of Monte\nCarlo event generators. In these proceedings I discuss the impact of different\ntheoretical descriptions for the process of top pair production at the LHC on\nthe extraction of $m_t$.", "positive": "$\u03c8(2S)$ photoproduction in high energy nuclear collisions: We study coherent photoproduction of $\\psi'$ and the subsequent suppression\nin high energy nuclear collisions. The hot medium effect on charmonium\nphotoproduction is controlled by the competition between the fireball size and\nnuclear size. When the former is smaller than the later, the photoproduction is\nonly slightly affected by the hot medium. We calculate the yield ratio of\n$\\psi'$ to $J/\\psi$ in semi-central Pb-Pb collisions at LHC energy, while the\nhigh $p_T$ limit is characterized by the fireball, its value in low $p_T$ limit\ncan still reach the significant enhancement by photoproduction." }, { "anchor": "$\u03b5'$ from right-handed currents: Recent lattice determinations of direct CP violation in kaon decays,\nparametrized by $\\epsilon'$, suggest a discrepancy of several sigma between\nexperiment and the standard model. Assuming that this situation is due to new\nphysics, we investigate a solution in terms of right-handed charged currents.\nChiral perturbation theory, in combination with lattice QCD results, allows one\nto accurately determine the effect of right-handed interactions on $\\epsilon'$.\nIn addition, similar techniques provide a direct link between the right-handed\ncontributions to $\\epsilon'$ and hadronic electric dipole moments. We\ndemonstrate that the $\\epsilon'$ discrepancy can be resolved with right-handed\ncharged currents, and that this scenario can be falsified by next-generation\nhadronic electric dipole moment experiments.", "positive": "Chiral symmetry breaking and the spin content of hadrons: From the parton distributions in the infinite momentum frame one finds that\nonly about 30% of the nucleon spin is carried by spins of the valence quarks,\nwhich gave rise to the term \"spin crisis\". Similar results hold for the lowest\nmesons, as it follows from the lattice simulations. We define the spin content\nof a meson in the rest frame and use a complete and orthogonal $\\bar q q$\nchiral basis and a unitary transformation from the chiral basis to the (2S+1)LJ\nbasis. Then, given a mixture of different allowed chiral representations in the\nmeson wave function at a given resolution scale, one can obtain its spin\ncontent at this scale. To obtain the mixture of the chiral representations in\nthe meson we measure in dynamical lattice simulations a ratio of couplings of\ninterpolarors with different chiral structure. For the rho meson we obtain\npractically the 3S1 state with no trace of the spin crisis. Then a natural\nquestion arises: which definition does reflect the spin content of a hadron?" }, { "anchor": "The Nature of the X(2175): We study the puzzling vector meson X(2175) in a multichannel generalisation\nof the Resonance-Spectrum-Expansion model. Besides the usual P-wave\npseudoscalar-pseudoscalar, pseudoscalar-vector, and vector-vector channels that\ncouple to mesons with vector quantum numbers, we also include the important\nS-wave vector-scalar, pseudoscalar-axialvector and vector-axialvector channels,\nincluding the observed $\\phi$(1020)$f_0$(980) decay mode. The strong coupling\nto nearby S-wave channels originates dynamically generated poles, two of which\ncome out close to the energy region of the X(2175), viz. at (2.037-i0.170) GeV\nand (2.382-i0.20) GeV. Further improvements are proposed.", "positive": "CP violation in multi-Higgs supersymmetric models: We consider supersymmetric extensions of the standard model with two pairs of\nHiggs doublets. We study the possibility of spontaneous $CP$ violation in these\nscenarios and present a model where the origin of $CP$ violation is soft, with\nall the complex phases in the Lagrangian derived from complex masses and vacuum\nexpectation values (VEVs) of the Higgs fields. The main ingredient of the model\nis an approximate global symmetry, which determines the order of magnitude of\nYukawa couplings and scalar VEVs. We assume that the terms violating this\nsymmetry are suppressed by powers of the small parameter\n$\\epsilon_{PQ}=O(m_b/m_t)$. The tree-level flavor changing interactions are\nsmall due to a combination of this global symmetry and a flavor symmetry, but\nthey can be the dominant source of $CP$ violation. All $CP$-violating effects\noccur at order $\\epsilon_{PQ}^2$ as the result of exchange of {\\it\nalmost}-decoupled extra Higgs bosons and/or through the usual mechanisms with\nan {\\it almost}-real CKM matrix. On dimensional grounds, the model gives\n$\\epsilon_K\\approx \\epsilon_{PQ}^2$ and predicts for the neutron electric\ndipole moment (and possibly also for $\\epsilon'_K$) a suppression of order\n$\\epsilon_{PQ}^2$ with respect to the values obtained in standard and minimal\nsupersymmetric scenarios. The predicted $CP$ asymmetries in $B$ decays are\ngenerically too small to be seen in the near future. The mass of the lightest\nneutral scalar, the strong $CP$ problem, and possible contributions to the $Z$\ndecay into $b$ quarks (the $R_b$ puzzle) are also briefly addressed in the\nframework of this model." }, { "anchor": "The Muon Magnetic Moment in the TeV Scale Seesaw Models: The reported discrepancy of the muon abnormal magnetic moment $a_\\mu^{}$ has\nimpacts on the low energy phenomenology. In this paper we calculate the\ncorrections to $a_\\mu$ in the standard model extended by the TeV scale seesaw\nmodels. We show that the correction induced by the type-I seesaw model is\nnegative and of the order ${\\cal O} (10^{-11})$, which can be neglected\ncompared with $a_\\mu^{\\rm SM}$. The correction induced by the type-II seesaw\nmodel, which depends on the mass of the Higgs triplet $m_\\Delta$ and the Yukawa\ncoupling $Y_\\Delta$, can be of the order ${\\cal O}(10^{-10})$ and compensate\nfor the discrepancy between $a_\\mu^{\\rm SM}$ and $a_{\\mu}^{\\rm exp}$. The\ncorrection induced by the type-III seesaw model is also negative and can be of\nthe order ${\\cal O}(10^{-10})$.", "positive": "The Exclusive Decay of Upsilon into $h_c$, the $X(3940)$ and $X(4160)$: In this paper, we study double charmonia production in Upsilon peaks,\nespecially, a S-wave charmonium $\\eta_c$ and a P-wave charmonium $h_c(^1P_1)$,\nor a S-wave charmonium $J/\\psi$ and the $X(3940)$ and $X(4160)$ within the\nnonrelativistic QCD (NRQCD) approach which is a powerful tool to realize the\nfactorization of double charmonia production in electron-positron annihilation.\nThe $J^{PC}=1^{--}$ state $\\Upsilon(nS)$ can provide an ideal laboratory for\nstudying the properties of double-heavy quarkonium and also can separate the\nperturbative and nonperturbative parts due to the large heavy quark mass\ncompared with the typical hadron scale $\\Lambda_{QCD}$. Explanation of the\n$X(3940)$ and $X(4160)$ as the $3 ^1S_0$ and $4 ^1S_0$ states, respectively,\nare compatible with the observed upper limits for the branching fractions of\n$\\Upsilon(1S,2S)\\to J/\\psi+X$, where $X=X(3940)$, $X(4160)$ by the Belle\nCollaboration. The branching fractions of $\\Upsilon(1S,2S,3S)\\to\n\\eta_c+h_c(^1P_1)$ are predicted to be around $10^{-6}$, which shall be tested\nin Belle-II experiments." }, { "anchor": "Vacuum energy with mass generation and Higgs bosons: We discuss the Higgs mass and cosmological constant hierarchy puzzles with\nemphasis on the interplay of Poincare invariance, mass generation and\nrenormalization group invariance. A plausible explanation involves an emergent\nStandard Model with the cosmological constant scale suppressed by power of the\nlarge scale of emergence. In this scenario the cosmological constant scale and\nneutrino masses should be of similar size.", "positive": "Unitarity In An Alternative Electroweak Theory: An electroweak (EW) model has been investigated (Moffat) in which the energy\n$E < \\mu=\\sqrt{\\lambda}M_W$, where $\\lambda$ is a gauge parameter and $M_W$ is\nthe $W$ boson mass. For large enough $\\lambda$ the scalar boson mass\n$\\mu=\\sqrt{\\lambda}M_W$ can be heavy enough to avoid detection in LHC\nexperiments. The theory is perturbatively renormalizable for the decoupled\nscalar interactions. The Born approximation tree graph unitarity can be ensured\nby postulating that the effective coupling constant $g_{\\rm eff}(s)$ vanishes\nas $1/\\sqrt{s}$ or faster as $s\\rightarrow\\infty$, predicting that the EW\ninteractions become weaker at high energies, and longitudinally polarized $W_L\nW_L\\rightarrow W_L W_L$ scattering does not violate Born approximation tree\ngraph unitarity." }, { "anchor": "Investigating charmonium production at LHC with the p pbar final state: We propose to investigate various charmonium states using their common decay\nchannel to p pbar at LHC. Having the branching ratios for charmonium decaying\ninto the p pbar final state measured or calculated, we propose to measure the\ncharmonium production rate for both hadroproduction including soft-diffraction\nand inclusive production from b-hadron decays. We discuss the theoretical\nimpacts in QCD of measuring different charmonium production rates and also the\nexperimental prospects at LHCb, in particular, those for yet unmeasured eta_c\nand h_c.", "positive": "U_A(1) anomaly and eta' mass from an infrared singular quark-gluon\n vertex: The $U_A(1)$ problem of QCD is inevitably tied to the infrared behaviour of\nquarks and gluons with its most visible effect being the $\\eta^\\prime$ mass. A\ndimensional argument of Kogut and Susskind showed that the mixing of the\npseudoscalar flavour-singlet mesons with gluons can provide a screening of the\nGoldstone pole in this channel if the full quark-quark interaction is strongly\ninfrared singular as $\\sim 1/k^4$. We investigate this idea using previously\nobtained results for the Landau gauge ghost and gluon propagator, together with\nrecent determinations for the singular behaviour of the quark-gluon vertex. We\nfind that, even with an infrared vanishing gluon propagator, the singular\nstructure of the quark-gluon vertex for certain kinematics is apposite for\nyielding a non-zero screening mass." }, { "anchor": "A consistent event generation for non-resonant diphoton production at\n hadron collisions: We have developed a Monte Carlo event generator for non-resonant diphoton\n($\\gamma\\gamma$) production at hadron collisions in the framework of GR@PPA,\nwhich consistently includes processes having additional one jet radiation. The\npossible double count problem in the generation of radiative processes is\navoided by using the LLL subtraction method that we have applied to the\nweak-boson production processes. The subtraction method has been extended to\nthe final-state QED divergence that appears in the $qg \\rightarrow \\gamma\\gamma\n+ q$ process. Because a parton shower (PS) which regularizes the subtracted QED\ndivergence is still under development, we tried to use PYTHIA for the\ngeneration of the fragmentation events to restore the subtracted components.\nThe simulation employing the \"old\" PS of PYTHIA shows a reasonable matching\nwith the GR@PPA events, and the combined event sample shows a result in\nreasonable agreement with ResBos. We found that the contribution from $qg\n\\rightarrow \\gamma\\gamma + q$ is significant in the LHC condition. This event\ngenerator must be useful for the background studies in low-mass Higgs boson\nsearches at LHC.", "positive": "On macroscopic residual QCD force of electrodynamics: We explore a connection between virtual particles of quantum electrodynamics\nand quantum chromodynamics (QCD) which is predicted to give rise to a residual\nattractive interaction measurable as a macroscopic force. We calculate the\nasymptotic behavior of relevant scattering amplitudes, perform their\nresummation, and analyze the sign of the resulting interaction. Then, we\ncalculate the primary experimentally observable consequences of this Standard\nModel force. We discuss the impact of this force at terrestrial scales and at\nastrophysical scales. In particular, we quantify the impact of this force on\nthe warm ionized medium present in galaxies and the intracluster medium present\nin cluster of galaxies." }, { "anchor": "The Uniqueness of the $\u0398^+$ Pentaquark: The existence of the $\\Theta^+$ pentaquark requires a peculiar mechanism to\nexplain its stability. Looking at quark clusters, notably diquark and triquark\nconfigurations, such a mechanism may be found in the color-magnetic interaction\nbetween quarks. It is possible to understand why the $\\Theta^+$ is unique.\nChiral dynamics, in particular the ease of pion emission, will render other\nmembers of the same flavor antidecuplet, such as the $\\Xi^{--}$ very unstable.", "positive": "Single inclusive particle production at next-to-leading order in\n proton-nucleus collisions at forward rapidities: hybrid approach meets TMD\n factorization: We revisit the calculation of the cross section for forward inclusive single\nhadron production in $pA$ collisions within the hybrid approach. We show that\nthe proper framework to perform this calculation beyond leading order is not\nthe collinear factorization, as has been assumed so far, but the TMD factorized\nframework. Within the TMD factorized approach we show that all the large\ntransverse logarithms appearing in the fixed order calculation, are resummed\ninto the evolution of the TMD PDFs and TMD FFs with factorization scale. The\nresulting expressions, when written in terms of TMDs evolved to the\nappropriate, physically well understood factorization scale, contain no\nadditional large logarithms. The absence of any large logarithms in the\nresummed result should ensure positivity of the cross section and eradicate the\npersistent problem that have plagued the previous attempts at calculating this\nobservable in the hybrid approach." }, { "anchor": "A Tale of Two $U(1)$'s: Kinetic Mixing from Lattice WGC States: We point out that the states required by the Lattice Weak Gravity Conjecture,\nalong with certain genericity conditions, imply the existence of non-vanishing\nkinetic mixing between massless Abelian gauge groups in the low-energy\neffective theory. We carry out a phenomenological estimate using a\nstring-inspired probability distribution for the masses of superextremal states\nand compare the results to expectations from string theory and field theory,\nestimating the magnitude of kinetic mixing in each case. In the string case, we\ncompute the kinetic mixing in an ensemble of 1858 MSSM-like heterotic orbifolds\nas well as in Type II supergravity on a Calabi-Yau manifold. From the field\ntheory perspective, we consider compactifications of a 5D gauge theory.\nFinally, we discuss potential loopholes that can evade the bounds set by our\nestimates.", "positive": "Baryogenesis and Leptogenesis from Supercooled Confinement: We propose a framework of baryogenesis and leptogenesis that relies on a\nsupercooled confining phase transition (PT) in the early universe. The baryon\nor lepton asymmetry is sourced by decays of hadrons of the strong dynamics\nafter the PT, and it is enhanced compared to the non-confining case, which was\nthe only one explored so far. This widens the energy range of the PT, where the\nobserved baryon asymmetry can be reproduced, down to the electroweak scale. The\nframework then becomes testable with gravity waves (GW) at LISA and the\nEinstein Telescope. We then study two explicit realisations: one of\nleptogenesis from composite sterile neutrinos that realises inverse see-saw;\none of baryogenesis from composite scalars that is partly testable by existing\ncolliders and flavour factories." }, { "anchor": "Magnetic skyrmions as host of neutrino mass spectroscopy: Large magneto-electric effect in multi-ferroics and topological protection\nagainst decays of excited magnetic skyrmions are an ideal setting for detecting\nradiative emission of neutrino pair (RENP). We propose a new RENP scheme using\nmulti-ferroic magnetic skyrmion condensates in order to determine the absolute\nneutrino mass including the mass hierarchy patterns, the type of neutrino mass\n(Majorana vs Dirac), one of CP violation parameters, and to detect relic 1.9 K\ncosmic neutrino. We critically examine the possibility of feasible experiments,\nand show what are required as good targets for neutrino physics.", "positive": "Neutralino and chargino masses and related sum rules beyond MSSM: We study the implications of dimension five operators involving Higgs chiral\nsuperfields for the masses of neutralinos and charginos in the minimal\nsupersymmetric standard model (MSSM). These operators can arise from additional\ninteractions beyond those of MSSM involving new degrees of freedom at or above\nthe TeV scale. In addition to the masses of the neutralinos and charginos, we\nstudy the sum rules involving the masses and squared masses of these particles\nfor different gaugino mass patterns in presence of the dimension five operators\nin the context of MSSM. We derive a relation for the higgsino mixing mass\nparameter and $\\tan\\beta$ in the presence of the dimension five operators." }, { "anchor": "Spin structure of the nucleon: QCD evolution, lattice results and models: The question how the spin of the nucleon is distributed among its quark and\ngluon constituents is still a subject of intense investigations. Lattice QCD\nhas progressed to provide information about spin fractions and orbital angular\nmomentum contributions for up- and down-quarks in the proton, at a typical\nscale \\mu^2~4 GeV^2. On the other hand, chiral quark models have traditionally\nbeen used for orientation at low momentum scales. In the comparison of such\nmodel calculations with experiment or lattice QCD, fixing the model scale and\nthe treatment of scale evolution are essential. In this paper, we present a\nrefined model calculation and a QCD evolution of lattice results up to\nnext-to-next-to-leading order. We compare this approach with the Myhrer-Thomas\nscenario for resolving the proton spin puzzle.", "positive": "CP Violation in $t\\to W^+ b$ Decays in Two-Higgs Doublet Model: Due to the large mass of top quark, CP violation in the top-quark decay is\nsensitive to the interactions mediated by Higgs bosons. We consider CP\nviolation in $t\\rightarrow W^+ b$ decay by calculating consistently in unitary\ngauge the CP-violating up-down asymmetry of the leptons from $W$ boson decays\nin $t\\rightarrow W^+ b$, defined by Grz\\c{a}dkowski and Gunion, in the\ntwo-Higgs doublet model with CP-violating neutral sector. The asymmetry is\nshown to be at most of the order of $(1-3)\\times 10^{-4}$ for $\\tan\\beta=1.0$,\nwhere $\\tan\\beta$ is the ratio of vacuum expectation values for the two neutral\nHiggs bosons." }, { "anchor": "Phenomenological analysis of multi-pseudoscalar mediated dark matter\n models: Non-minimal simplified extensions of the Standard Model have gained\nconsiderable currency in the context of dark matter searches at the LHC, since\nthey predict enhanced mono-Higgs and mono-$W/Z$ signatures over large parts of\nthe parameter space. However, these non-minimal models obviously lack the\nsimplicity and directness of the original simplified models, and are more\nheavily dependent on the model assumptions. We propose to classify these models\ngenerically on the basis of additional mediator(s) and dark matter particles.\nAs an example, we take up a scenario involving multiple pseudoscalar mediators,\nand a single Dirac dark matter particle, the latter being a popular\nintroduction to ensure ultraviolet completion of theories with multiple\npseudoscalar fields. In the chosen scenario, we discuss the viable channels and\nsignatures of relevance at the future runs of the LHC. These are then compared\nwith the minimal simplified scenarios and distinguishing features are\npinpointed.", "positive": "Supersymmetry, direct and indirect constraints: We present an overview of direct and indirect constraints in the MSSM, in\nCP-conserving and CP-violating MSSM scenarios, with some emphasis on the\nimportance of combining the constraints from different sectors, namely SUSY and\nHiggs direct searches at the LHC, flavour physics, dark matter and electric\ndipole moments." }, { "anchor": "Horizontal Symmetries $\u0394(150)$ and $\u0394(600)$: Using group theory of mixing to examine all finite subgroups of SU(3) with an\norder less than 512, we found recently that only the group $\\Delta(150)$ can\ngive rise to a correct reactor angle $\\th_{13}$ of neutrino mixing without any\nfree parameter. It predicts $\\sin^22\\th_{13}=0.11$ and a sub-maximal\natmospheric angle with $\\sin^22\\th_{23}=0.94$, in good agreement with\nexperiment. The solar angle $\\th_{12}$, the CP phase $\\d$, and the neutrino\nmasses $m_i$ are left as free parameters. In this article we provide more\ndetails of this case, discuss possible gain and loss by introducing\nright-handed symmetries, and/or valons to construct dynamical models. A simple\nmodel is discussed where the solar angle agrees with experiment, and all its\nmixing parameters can be obtained from the group $\\Delta(600)$ by symmetry\nalone. The promotion of $\\Delta(150)$ to $\\Delta(600)$ is on the one hand\nanalogous to the promotion of $S_3$ to $S_4$ in the presence of tribimaximal\nmixing, and on the other hand similar to the extension from $A_4$ to $S_4$ in\nthat case.", "positive": "Theoretical uncertainties for electroweak and Higgs-boson precision\n measurements at FCC-ee: Due to the high anticipated experimental precision at the Future Circular\nCollider FCC-ee (or other proposed $e^+e^-$ colliders, such as ILC, CLIC, or\nCEPC) for electroweak and Higgs-boson precision measurements, theoretical\nuncertainties may have, if unattended, an important impact on the\ninterpretation of these measurements within the Standard Model (SM), and thus\non constraints on new physics. Current theory uncertainties, which would\ndominate the total uncertainty, need to be strongly reduced through future\nadvances in the calculation of multi-loop radiative corrections together with\nimproved experimental and theoretical control of the precision of SM input\nparameters. This document aims to provide an estimate of the required\nimprovement in calculational accuracy in view of the anticipated high precision\nat the FCC-ee. For the most relevant electroweak and Higgs-boson precision\nobservables we evaluate the corresponding quantitative impact." }, { "anchor": "Some Implications of the Leptonic Annihilation of Dark Matter: Possible\n Galactic Radio Emission Signatures and the Excess Radio Flux of Extragalactic\n Origin: We give theoretical predictions for the radio emission of a dark matter\ncandidate annihilating into 2-lepton and 4-lepton final states. We then compare\nour results with the known radio measurements of the sky temperature as a\nfunction of the frequency. In particular, we calculate the radio emission for\nsome dark matter candidates annihilating into intermediate bosons that\nsubsequently decay into a 4-lepton channel with a thermal annihilation\ncross-section. We show that within the range of frequencies from $20\\,{\\rm\nMHz}$ to $5\\,{\\rm GHz}$, this channel can produce a stronger signature than\ndirect annihilation into leptons.", "positive": "Spectrum of scalar and pseudoscalar glueballs from functional methods: We provide results for the spectrum of scalar and pseudoscalar glueballs in\npure Yang-Mills theory using a parameter-free fully self-contained truncation\nof Dyson-Schwinger and Bethe-Salpeter equations. The only input, the scale, is\nfixed by comparison with lattice calculations. We obtain ground state masses of\n$1.9\\,\\text{GeV}$ and $2.6\\,\\text{GeV}$ for the scalar and pseudoscalar\nglueballs, respectively, and $2.6\\,\\text{GeV}$ and $3.9\\,\\text{GeV}$ for the\ncorresponding first excited states. This is in very good quantitative agreement\nwith available lattice results. Furthermore, we predict masses for the second\nexcited states at $3.7\\,\\text{GeV}$ and $4.3\\,\\text{GeV}$. The quality of the\nresults hinges crucially on the self-consistency of the employed input. The\nmasses are independent of a specific choice for the infrared behavior of the\nghost propagator providing further evidence that this only reflects a\nnonperturbative gauge completion." }, { "anchor": "Nnaturalness: We present a new solution to the electroweak hierarchy problem. We introduce\n$N$ copies of the Standard Model with varying values of the Higgs mass\nparameter. This generically yields a sector whose weak scale is parametrically\nremoved from the cutoff by a factor of $1/\\sqrt{N}$. Ensuring that reheating\ndeposits a majority of the total energy density into this lightest sector\nrequires a modification of the standard cosmological history, providing a\npowerful probe of the mechanism. Current and near-future experiments will\nexplore much of the natural parameter space. Furthermore, supersymmetric\ncompletions which preserve grand unification predict superpartners with mass\nbelow $m_W \\times M_{\\text{pl}} / M_{\\text{GUT}} \\sim 10$ TeV.", "positive": "Light 1-+ exotics: molecular resonances: Highlights in the search for nonconventional (non qqbar) meson states are the\npi_1(1400) and pi_1(1600) exotic candidates. Should they exist, mounting\ntheoretical arguments suggest that they are tetraquark molecular resonances\nexcitable by meson rescattering.\n We report a new tetraquark calculation within a model field theory\napproximation to Quantum Chromodynamics in the Coulomb gauge supporting this\nconjecture. We also strengthen this claim by consistently contrasting results\nwith exotic state predictions for hybrid (q qbar g) mesons within the same\ntheoretical framework.\n Our findings confirm that molecular-like configurations involving two color\nsinglets (a resonance, not a bound state) are clearly favored over hybrid or\ncolor-exotic tetraquark meson (q qbar q qbar atoms) formation.\n Finally, to assist needed further experimental searches we document a useful\noff-plane correlator for establishing the structure of these exotic systems\nalong with similar, but anticipated much narrower, states that should exist in\nthe charmonium and bottomonium spectra." }, { "anchor": "Strange nucleon form factors in the perturbative chiral quark model: We apply the perturbative chiral quark model at one loop to calculate the\nstrange form factors of the nucleon. A detailed numerical analysis of the\nstrange magnetic moments and radii of the nucleon, and also the momentum\ndependence of the form factors is presented.", "positive": "Rapidity and Transverse Momentum Distributions of DIS 1-jet Inclusive\n Cross Section -- A Next-to-Leading Order Monte-Carlo Prediction: We have implemented in the RAPGAP program a previously derived subtraction\nmethod for next-to-leading order (NLO) corrections in Monte-Carlo event\ngenerators, and we show results for jet production in deep inelastic\nscattering. At small x_{bj}, NLO corrections are comparable to the LO cross\nsection, because of the large gluon density. We devise a jet observable that is\nparticularly sensitive to the treatment of parton kinematics, which our method\nis intended to treat correctly. We compare the results of the calculation with\nLO calculations and with the previously existing treatment of NLO processes in\nRAPGAP. Substantial corrections to the event distribution are found." }, { "anchor": "Interplay of LFV and slepton mass splittings at the LHC as a probe of\n the SUSY seesaw: We study the impact of a type-I SUSY seesaw concerning lepton flavour\nviolation (LFV) both at low-energies and at the LHC. The study of the di-lepton\ninvariant mass distribution at the LHC allows to reconstruct some of the masses\nof the different sparticles involved in a decay chain. In particular, the\ncombination with other observables renders feasible the reconstruction of the\nmasses of the intermediate sleptons involved in $ \\chi_2^0\\to \\tilde \\ell\n\\,\\ell \\to \\ell \\,\\ell\\,\\chi_1^0$ decays. Slepton mass splittings can be either\ninterpreted as a signal of non-universality in the SUSY soft breaking-terms\n(signalling a deviation from constrained scenarios as the cMSSM) or as being\ndue to the violation of lepton flavour. In the latter case, in addition to\nthese high-energy processes, one expects further low-energy manifestations of\nLFV such as radiative and three-body lepton decays. Under the assumption of a\ntype-I seesaw as the source of neutrino masses and mixings, all these LFV\nobservables are related. Working in the framework of the cMSSM extended by\nthree right-handed neutrino superfields, we conduct a systematic analysis\naddressing the simultaneous implications of the SUSY seesaw for both high- and\nlow-energy lepton flavour violation. We discuss how the confrontation of\nslepton mass splittings as observed at the LHC and low-energy LFV observables\nmay provide important information about the underlying mechanism of LFV.", "positive": "Factorization and QCD Enhancements in the Compton Mechanism of W And Z\n Boson Hadroproduction: It is argued that $W/Z$ boson production in ultra-relativistic $pp$\ncollisions in the fragmentation region, subject to a kinematic cut on the boson\ntransverse momentum $Q_\\perp>Q_{\\perp\\min}$, with 1 GeV/c$\\ll Q_{\\perp\\min}\\ll\nM_{W/Z}$, must be dominated by the Compton mechanism $qg\\to q'W/Z$. We propose\napplications for boson hadroproduction in this kinematics and formulate the\nfactorization theorem. The analysis of QCD enhancements indicates that Regge\nbehavior should manifest itself not only in the $s$ but also in\n$Q_\\perp$-dependence of the boson production differential cross-section." }, { "anchor": "Weak decay of uniformly accelerated protons and related processes: We investigate the weak interaction emission of spin-1/2 fermions from\naccelerated currents. As particular applications, we analyze the decay of\nuniformly accelerated protons and neutrons, and the neutrino-antineutrino\nemission from uniformly accelerated electrons. The possible relevance of our\nresults to astrophysics is also discussed.", "positive": "Observability at LEP2 hadronic channels of a Z' with small lepton\n couplings: We consider the effects of a number of models with one extra $Z$, with\nenhanced couplings to quarks, in the final \\underline{hadronic} channels at\nLEP2. We show that, for a number of representative cases, visible effects could\nbe produced even for very low values of the \\underline{lepton} couplings, much\nsmaller than the existing LEP1/SLC and the future LEP2 (lepton channel) bounds." }, { "anchor": "Early SU(4)_PS x SU(2)_L x SU(2)_R x SU(2)_H Unification of Quarks and\n Leptons: We discuss various aspects of the early petite unification (PUT) of quarks\nand leptons based on the gauge group G_PUT=SU(4)_PS x SU(2)_L x SU(2)_R x\nSU(2)_H. This unification takes place at the scale M= O(1-2 TeV) and gives the\ncorrect value of sin^2 theta_W(M_Z^2) without the violation of the upper bound\non the K_L -> mu e rate and the limits on FCNC processes. These properties\nrequire the existence of three new generations of unconventional quarks and\nleptons with charges up to 4/3 (for quarks) and 2 (for leptons) and masses\nO(250 GeV) in addition to the standard three generations of quarks and leptons.\nThe horizontal group SU(2)_H connects the standard fermions with the\nunconventional ones. We work out the spontaneous symmetry breaking (SSB) of the\ngauge group G_PUT down to the SM gauge group, generalize the existing one-loop\nrenormalization group (RG) analysis to the two-loop level including the\ncontributions of Higgs scalars and Yukawa couplings, and demonstrate that the\npresence of three new generations of heavy unconventional quarks and leptons\nwith masses O(250 GeV) is consistent with astrophysical constraints. The NLO\nand Higgs contributions to the RG analysis are significant while the Yukawa\ncontributions can be neglected.", "positive": "Inflation and long-range force from clockwork $D$-term: Cosmic inflation driven by the vacuum energy associated with the $D$-term of\na supersymmetric abelian gauge group and a possible existence of long-range\nforce mediated by an ultra-light gauge boson $Z^\\prime$ are two extreme\nexamples of models based on extra $U(1)$ symmetries. Large vacuum energy sets\nthe scale of inflation while the scales of long-range forces induced by anomaly\nfree extra gauged $U(1)$ symmetries are constrained by neutrino oscillations,\nbinary pulsar timings and invisible neutrino decay. There exists a difference\nof about 40 orders of magnitude between the scales of these two. Also, gauge\ncouplings associated with the long-range forces are very small compared to the\nstandard model couplings and the one required for inflation. We propose a\nframework based on clockwork mechanism in which these vastly different scales\nand associated new physics can coexist without invoking any arbitrarily small\nor large parameter in the fundamental theory. A chain of $U(1)$ is introduced\nwith characteristic nearest-neighbour interactions. A large $D$-term introduced\nat one end governs the dynamics of inflation. $Z^\\prime$ is localized on the\nother end of the chain, and it can be massless or can get naturally suppressed\nmass. The standard model fields can be charged under one of the intermediate\n$U(1)$ in the chain to give rise to their small effective coupling $g^\\prime$\nwith $Z^\\prime$. Constraints on $g^\\prime$ and $M_{Z^\\prime}$ are discussed in\nthe context of the long-range forces of type $L_\\mu - L_\\tau$, $L_e - L_\\mu$\nand $B-L$. These, along with the inflation observables, are used to constraint\nthe parameters of the underlying clockwork model." }, { "anchor": "Signals of New Physics in the Underlying Event: LHC searches for new physics focus on combinations of hard physics objects.\nIn this work we propose a qualitatively different soft signal for new physics\nat the LHC - the \"anomalous underlying event\". Every hard LHC event will be\naccompanied by a soft underlying event due to QCD and pile-up effects. Though\nit is often used for QCD and monte carlo studies, here we propose the\nincorporation of an underlying event analysis in some searches for new physics.\nAn excess of anomalous underlying events may be a smoking-gun signal for\nparticular new physics scenarios such as \"quirks\" or \"hidden valleys\" in which\nlarge amounts of energy may be emitted by a large multiplicity of soft\nparticles. We discuss possible search strategies for such soft diffuse signals\nin the tracking system and calorimetry of the LHC experiments. We present a\ndetailed study of the calorimetric signal in a concrete example, a simple quirk\nmodel motivated by folded supersymmetry. In these models the production and\nradiative decay of highly excited quirk bound states leads to an \"antenna\npattern\" of soft unclustered energy. Using a dedicated simulation of a toy\ndetector and a \"CMB-like\" multipole analysis we compare the signal to the\nexpected backgrounds.", "positive": "Pionium as a source of false events in the $K\\to\u03c0\u03bd\\bar\u03bd$ decays: We suggest that the decay modes of kaons with a pion and a pionium\n($\\pi^+\\pi^-$ atom) in the final state can constitute a not yet considered\nbackground to the very rare decay $K\\to\\pi\\nu\\bar\\nu$. In fact, a part of\npioniums may escape the decay region before decaying into two $\\pi^0$s (or to\n$\\pi^0\\pi^0\\gamma$ in the case of excited pionium). To illustrate the\nimportance of this background, we show that it may even explain, under some\nassumptions, the unexpected $K_L$ decay events that appeared in the KOTO\nexperiment." }, { "anchor": "Abundant radiation of soft photons: a puzzle lasting four decades: The observed enhancement of low-kT photons in comparison with incorrect\ncalculations, should not be treated as a puzzle. The paper by Low considered a\nlarge rapidity gap process of diffractive excitation of a hadron, h ->\nh+\\gamma, rather than multiple hadron production spanning all over the rapidity\ninterval between colliding hadrons. The optical theorem connects these two\nprocesses, and what is inner bremsstrahlung, suppressed according to Low,\ncorresponds to radiation from final state hadrons. Thus, the main result of the\nLow theorem, based on gauge invariance of the diffractive bremsstrahlung\namplitude, supplemented with the optical theorem, contradicts the so-called\nbremsstrahlung model. The latter has been used for comparison with data,\nleading to the longstanding soft photon puzzle.", "positive": "Scalar Bosons and Supersymmetry: The recent discovery of a spin-0 Brout-Englert-Higgs boson leads to further\nenquire about other fundamental scalars. Supersymmetric theories involve, in\nrelation with the electroweak breaking, five such scalars at least, two charged\nand three neutral ones, usually denoted as H$^\\pm$, H, h and A. They also\nintroduce spin-0 squarks and sleptons as the superpartners of quarks and\nleptons.\n Supersymmetric extensions of the standard model lead to the possibility of\ngauge/BEH unification by providing spin-0 bosons as extra states for spin-1\ngauge bosons within massive gauge multiplets. Depending on its properties the\n125 GeV boson observed at CERN may then also be interpreted, up to a mixing\nangle induced by supersymmetry breaking, as the spin-0 partner of the Z under\ntwo supersymmetry transformations, i.e. as a Z that would be deprived of its\nspin." }, { "anchor": "Deciphering Colour Building Blocks of Massive Multiparton Amplitudes at\n 4-loops and beyond: The soft function in non-abelian gauge theories exponentiate, and their\nlogarithms can be organised in terms of the collections of Feynman diagrams\ncalled Cwebs. The colour factors that appear in the logarithm are controlled by\nthe web mixing matrices. Direct construction of the diagonal blocks of Cwebs\nusing the new concepts of Normal ordering, basis Cweb and Fused-Web was\nrecently carried out in~\\cite{Agarwal:2022wyk}. In this article we establish\ncorrespondence between the boomerang webs introduced in ~\\cite{Gardi:2021gzz}\nand non-boomerang Cwebs. We use this correspondence together with Uniqueness\ntheorem and Fused web formalism introduced in ~\\cite{Agarwal:2022wyk} to obtain\nthe diagonal blocks of four general classes of Cwebs to all orders in\nperturbation theory which also cover all the four loop Boomerang Cwebs\nconnecting four Wilson lines. We also fully construct the mixing matrix of a\nspecial Cweb to all orders in perturbation theory.", "positive": "Understanding saturation and AA collisions with an eA collider: The initial conditions in high energy nucleus-nucleus collisions are\ndetermined by the small momentum fraction part of the nuclear wavefunction.\nThis is the regime of gluon saturation and the most direct way to\nexperimentally study it would be deep inelastic scattering at a high energy\nelectron ion collider (EIC). This talk discusses some of the connections\nbetween physics at the EIC and the initial stage of relativistic heavy ion\ncollisions. We argue that measurements at an EIC will provide detailed\nhigh-precision information about the parameters for the initial conditions,\ntransverse geometry and longitudinal correlations that will be crucial in\nunderstanding the initial stage of a heavy ion collision." }, { "anchor": "Combined Analysis of Two- and Three-Particle Correlations in q,p-Bose\n Gas Model: q-deformed oscillators and the q-Bose gas model enable effective description\nof the observed non-Bose type behavior of the intercept (\"strength\")\n$\\lambda^{(2)}\\equiv C^{(2)}(K,K)-1$ of two-particle correlation function\n$C^{(2)}(p_1,p_2)$ of identical pions produced in heavy-ion collisions. Three-\nand n-particle correlation functions of pions (or kaons) encode more\ninformation on the nature of the emitting sources in such experiments. And so,\nthe q-Bose gas model was further developed: the intercepts of n-th order\ncorrelators of q-bosons and the n-particle correlation intercepts within the\nq,p-Bose gas model have been obtained, the result useful for quantum optics,\ntoo. Here we present the combined analysis of two- and three-pion correlation\nintercepts for the q-Bose gas model and its q,p-extension, and confront with\nempirical data (from CERN SPS and STAR/RHIC) on pion correlations. Similar to\nexplicit dependence of $\\lambda^{(2)}$ on mean momenta of particles (pions,\nkaons) found earlier, here we explore the peculiar behavior, versus mean\nmomentum, of the 3-particle correlation intercept $\\lambda^{(3)}(K)$. The whole\napproach implies complete chaoticity of sources, unlike other joint\ndescriptions of two- and three-pion correlations using two phenomenological\nparameters (e.g., core-halo fraction plus partial coherence of sources).", "positive": "Aspects of the Tetrahedral Neutrino Mass Matrix: The four-parameter tetrahedral neutrino mass matrix introduced earlier by the\nauthor is studied in two specific limits, both having only two parameters and\nresulting in theta_13=0, theta_23=pi/4, and tan^2 theta_12=1/2. One limit\ncorresponds to a recent proposal which predicts a normal ordering of neutrino\nmasses; the other is new and allows both inverted and normal ordering." }, { "anchor": "Color suppressed contributions to the decay modes B_{d,s} -> D_{s,d}\n D_{s,d}, B_{d,s} -> D_{s,d} D^*_{s,d}, and B_{d,s} -> D^*_{s,d} D^*_{s,d}: The amplitudes for decays of the type $B_{d,s} \\to D_{s,d} D_{s,d}$, have no\nfactorizable contributions, while $B_{d,s} \\to D_{s,d} D^*_{s,d}$, and $B_{d,s}\n\\to D^*_{s,d} D^*_{s,d}$ have relatively small factorizable contributions\nthrough the annihilation mechanism. The dominant contributions to the decay\namplitudes arise from chiral loop contributions and tree level amplitudes which\ncan be obtained in terms of soft gluon emissions forming a gluon condensate. We\npredict that the branching ratios for the processes $\\bar B^0_d \\to D_s^+\nD_s^-$,\n $\\bar B^0_d \\to D_s^{+*} D_s^- $ and $\\bar B^0_d \\to D_s^+ D_s^{-*}$ are all\nof order $(2- 3) \\times 10^{-4}$, while $\\bar B^0_s \\to D_d^+ D_d^-$,\n $\\bar B^0_s \\to D_d^{+*} D_d^- $ and $\\bar B^0_s \\to D_d^+ D_d^{-*}$ are of\norder $(4- 7) \\times 10^{-3}$. We obtain branching ratios for two $D^*$'s in\nthe final state of order two times bigger.", "positive": "Collider constraints on Gauss-Bonnet coupling in warped geometry model: In this paper the requirement of a warp solution in an Einstein-Gauss-Bonnet\n5D warped geometry is shown to fix the signature of Gauss-Bonnet coupling\n($\\alpha_{5}$). Further, imposing the phenomenological constraints, obtained\nfrom the recently observed Higgs like scalar mass as well as $\\mu$ parameter of\nthe decay channels ${H}_{0}\\rightarrow\\gamma\\gamma,\\tau{\\bar \\tau}$ explored in\nATLAS and CMS detectors, we obtain a stringent bound on $\\alpha_{5}$ within\n$(4.8 - 5.1)\\times 10^{-7}$." }, { "anchor": "Antimatter regions in the baryon-dominated Universe: Quantum fluctuations of a complex, baryonic charged scalar field caused by\ninflation can generate large domains, which convert later into antimatter\nregions. As a result the Universe can become globally matter-dominated, with\nminor contribution of antimatter regions. The distribution and evolution of\nsuch antimatter regions could cause every galaxy to be a harbour of an\nanti-star globular cluster. At the same time, the scenario does not lead to\nlarge-scale isocuvature perturbations, which would disturb observable CMB\nanisotropy. The existence of one of such antistar globular cluster in our\nGalaxy does not contradict the observed $\\gamma$-ray background, but the\nexpected fluxes of $\\bar{\\rm ^4He}$ and $\\bar{\\rm ^3He}$ from such an\nantimatter object are definitely accessible to the sensitivity of the coming\nAMS--02 experiment.", "positive": "Observational constraints on dark matter decaying via gravity portals: Global symmetry can guarantee the stability of dark matter particles (DMps).\nHowever, the nonminimal coupling between dark matter (DM) and gravity can\ndestroy the global symmetry of DMps, which in turn leads to their decay. Under\nthe framework of nonminimal coupling between scalar singlet dark matter (ssDM)\nand gravity, it is worth exploring to what extent the symmetry of ssDM is\nbroken. It is suggested that the total amount of decay products of ssDM cannot\nexceed current observational constraints. Along these lines, the data obtained\nwith satellites such as Fermi-LAT and AMS-02 can limit the strength of the\nglobal symmetry breaking of ssDM. Since the mass of many well--motivated DM\ncandidates may be in the GeV--TeV range, we determine a reasonable parameter\nrange for the lifetime in this range. We find that when the mass of the ssDM is\naround the electroweak scale (246 GeV), the corresponding 3--$\\sigma$ lower\nlimits of the lifetime of ssDM is $5.3\\times10^{26}$ s. Our analysis of ssDM\naround the typical electroweak scale contains the most abundant decay channels\nof all mass range, so the analysis of the behaviour of ssDM under the influence\nof gravity is more comprehensive." }, { "anchor": "More Synergies from Beauty, Top, $Z$ and Drell-Yan Measurements in SMEFT: We perform a global analysis of Beauty, Top, $Z$ and Drell-Yan measurements\nin the framework of the Standard Model effective theory (SMEFT). We work within\nthe minimal flavor violation (MFV) hypothesis, which relates different sectors\nand generations beyond the $SU(2)_L$-link between left-handed top and beauty\nquarks. We find that the constraints on the SMEFT Wilson coefficients from the\ncombined analysis are stronger than the constraints from a fit to the\nindividual sectors, highlighting synergies in the global approach. We also show\nthat constraints within MFV are strengthened compared to single-generation\nfits. The strongest bounds are obtained for the semileptonic four-fermion\ntriplet operator $C_{lq}^{(3)}$, probing scales as high as $18$ TeV, followed\nby the gluon dipole operator $C_{uG}$ with $7$ TeV, and other four-fermion and\npenguin operators in the multi-TeV range. Operators with left-handed quark\nbilinears receive order one contributions from higher orders in the MFV\nexpansion induced by the top Yukawa coupling as a result of the FCNC $b \\to s\n\\mu \\mu$ anomalies combined with the other sectors. We predict the $68\\%$\ncredible intervals of the dineutrino branching ratios within MFV as $5.3 \\cdot\n10^{-6} \\leq {\\cal{B}}(B^0 \\to K^{* 0} \\nu \\bar\\nu) \\leq 12.8 \\cdot 10^{-6}$\nand $ 2.5 \\cdot 10^{-6} \\leq {\\cal{B}}(B^+ \\to K^+ \\nu \\bar\\nu) \\leq 5.9 \\cdot\n10^{-6}$, which include the respective Standard Model predictions, and are in\nreach of the Belle II experiment. We show how future measurements of the\ndineutrino branching ratios can provide insights into the structure of new\nphysics in the global fit.", "positive": "Nucleon magnetic moments in an extended chiral constituent quark model: We present results for the nucleon magnetic moments in the context of an\nextended chiral constituent quark model based on the mechanism of the Goldstone\nboson exchange, as suggested by the spontaneous breaking of chiral symmetry in\nQCD. The electromagnetic charge-current operator is consistently deduced from\nthe model Hamiltonian, which includes all force components for the\npseudoscalar, vector and scalar meson exchanges. Thus, the continuity equation\nis satisfied for each piece of the interaction, avoiding the introduction of\nany further parameter. A good agreement with experimental values is found. The\nrole of isoscalar two-body operators, not constrained by the continuity\nequation, is also investigated." }, { "anchor": "Baryon number violation in supersymmetry: Neutron-antineutron\n oscillations as a probe beyond the LHC: We summarize the current status of baryon number violation in supersymmetry\nand provide prospects for going beyond the present reach by means of a new\nsearch for neutron-antineutron oscillations. The main motivation is the\nrecently proposed neutron-antineutron oscillation experiment at the European\nSpallation Source in Lund, Sweden, which is projected to be able to improve the\ncurrent bound on the transition probability in the quasi-free regime by three\norders of magnitude. We consider various processes involving superpartners that\ngive rise to neutron-antineutron oscillations and extract the corresponding\nsimplified models, including only the most relevant superpartners and\ncouplings. In terms of these models we recast and determine the exclusion\nlimits from LHC searches as well as from searches for flavor transitions, CP\nviolation and di-nucleon decays. We find that, for certain regions of the\nparameter space, the proposed neutron-antineutron experiment has a reach that\ngoes beyond all other experiments, as it can probe gluino and squark masses in\nthe multi-TeV range.", "positive": "Leading logarithmic large-x resummation of off-diagonal splitting\n functions and coefficient functions: We analyze the iterative structure of unfactorized partonic structure\nfunctions in the large-x limit, and derive all-order expressions for the\nleading-logarithmic off-diagonal splitting functions P_gq and P_qg and the\ncorresponding coefficient functions C_phi,q and C_2,g in Higgs- and gauge-boson\nexchange deep-inelastic scattering. The splitting functions are given in terms\nof a new function not encountered in perturbative QCD so far, and vanish\nmaximally in the supersymmetric limit C_A - C_F to 0. The coefficient functions\ndo not vanish in this limit, and are given by simple expressions in terms of\nthe above new function and the well-known leading-logarithmic threshold\nexponential. Our results also apply to the evolution of fragmentation functions\nand semi-inclusive e^+ e^- annihilation." }, { "anchor": "Electric Dipole Moments and the Mass Scale of New T-Violating,\n P-Conserving Interactions: We consider the implications of experimental limits on the permanent electric\ndipole moment (EDM) of the electron and neutron for possible new\nparity-conserving (PC) time-reversal violating (TV) interactions. We show that\nthe constraints derived from one-loop contributions to the EDM exceed\npreviously reported two-loop limits by more than an order of magnitude and\nimply a lower bound on the new TVPC mass scale $\\lamtv$ of 100 TeV for new TVPC\nstrong interactions. These results imply a value of $10^{-15}$ or smaller for\nthe ratio of low-energy TVPC matrix elements to those of the residual strong\ninteraction.", "positive": "Towards Complete Neutrino Mixing Matrix and CP-Violation: The compelling experimental evidences for oscillations of solar, atmospheric\nand reactor neutrinos imply the existence of 3-neutrino mixing in vacuum. We\nreview the phenomenology of 3-neutrino mixing, and the current data on the\n3-neutrino mixing parameters. The opened questions and the main goals of future\nresearch in the field of neutrino mixing and oscillations are outlined. A\nphenomenological approach for understanding the pattern of neutrino mixing as\nan interplay between the mixing, arising from the charged lepton sector, and\nbimaximal mixing, arising from a neutrino Majorana mass matrix, is considered\nwith emphasis on the CP-violating case. We comment also on planned future steps\nin the experimental studies of neutrino mixing." }, { "anchor": "Tests of the Noncommutative Standard Model at a Future Photon Collider: Extensions of the Standard Model of elementary particle physics to\nnoncommutative geometries are proposed by string models. Independent of this\nmotivation, one may consider such a model as an effective field theory with\nhigher-dimensional operators containing an antisymmetric rank-2 background\nfield. We study the signals of such a Noncommutative Standard Model (NCSM) and\nanalyze the discovery potential of fermion pair production at a future photon\ncollider.", "positive": "On Lepton Number Violation in Heavy Neutrino Decays at Colliders: We study the perspective to observe lepton number violating signatures from\nheavy Majorana neutrino decays at colliders in view of the requirement to\nexplain the light neutrino masses via the seesaw mechanism. In the minimal\nmodel with only two heavy neutrinos and in the $\\nu$MSM one can identify three\ndistinct regions in the mass-mixing plane. For Majorana masses above the\nelectroweak scale the branching ratio for lepton number violating processes at\nthe LHC is generically suppressed. For masses well below the electroweak scale\nthat are probed in displaced vertex searches or at fixed target experiments\nlepton number violation is the rule and can only be avoided at the cost of fine\ntuning. In between there is a mass regime where both possibilities coexist. In\nmodels with more than two heavy neutrinos the larger parameter space allows for\nmore freedom, but our results remain qualitatively correct unless there is a\nmass degeneracy amongst more than two of the heavy neutrinos." }, { "anchor": "Tribimaximal Mixing, Leptogenesis, and theta13: We show that seesaw models based on flavor symmetries (such as A_4 and Z_7 X\nZ_3) which produce exact tribimaximal neutrino mixing, also imply a vanishing\nleptogenesis asymmetry. We show that higher order symmetry breaking corrections\nin these models can give a non-zero leptogenesis asymmetry and generically also\ngive deviations from tribimaximal mixing and a non-zero theta13 >~ 10^(-2)", "positive": "Vacuum Decay on a Brane World: The bubble nucleation rate for a first order phase transition occurring on a\nbrane world is calculated. Both the Coleman-de Luccia thin wall instanton and\nthe Hawking-Moss instanton are considered. The results are compared with the\ncorresponding nucleation rates for standard four-dimensional gravity." }, { "anchor": "New physics in $b\\to s \\ell\\ell$ decays with complex Wilson coefficients: We perform a data-driven analysis of new physics (NP) effects in exclusive $b\n\\to s \\ell^+\\ell^-$ decays in a model-independent effective theory approach\nwith dimension six operators considering scalar, pseudo-scalar, vector and\naxial-vector operators with the corresponding Wilson coefficients (WC) taken to\nbe complex. The analysis has been done with the most recent data while\ncomparing the outcome with that from the relatively old data-set. We find that\na left-handed quark current with vector muon coupling is the only one-operator\n$(\\mathcal{O}_9)$ scenario that can explain the data in both the cases with\nreal and complex WC with a large non-zero imaginary contribution. We\nsimultaneously apply model selection tools like cross-validation and\ninformation-theoretic approach like Akaike Information Criterion (AIC) to find\nout the operator or sets of operators that can best explain the available data\nin this channel. The $\\mathcal{O}_9$ with complex WC is the only one-operator\nscenario which survives the test. However, there are a few two and\nthree-operator scenarios (with real or complex WCs) which survive the test, and\nthe operator $\\mathcal{O}_9$ is common among them.", "positive": "Smoking-gun signatures of little Higgs models: Little Higgs models predict new gauge bosons, fermions and scalars at the TeV\nscale that stabilize the Higgs mass against quadratically divergent one-loop\nradiative corrections. We categorize the many little Higgs models into two\nclasses based on the structure of the extended electroweak gauge group and\nexamine the experimental signatures that identify the little Higgs mechanism in\naddition to those that identify the particular little Higgs model. We find that\nby examining the properties of the new heavy fermion(s) at the LHC, one can\ndistinguish the structure of the top quark mass generation mechanism and test\nthe little Higgs mechanism in the top sector. Similarly, by studying the\ncouplings of the new gauge bosons to the light Higgs boson and to the Standard\nModel fermions, one can confirm the little Higgs mechanism and determine the\nstructure of the extended electroweak gauge group." }, { "anchor": "Probing the strong electroweak symmetry breaking in a model with a\n vector resonance: We systematically study the possibility to probe the physics behind the\nelectroweak symmetry breaking at the LHC assuming new strong interactions being\nresponsible for the effect. The new physics is described by the Higgs-less\neffective Lagrangian with a vector resonance in the particle spectrum, in\naddition to the Standard Model fields. We analyze signals of the resonance in\nthe mixing-induced LHC processes pp-> abX,\nab=t\\bar{t},b\\bar{b},t\\bar{b},W^+Z,W^+W^-. At this level of our calculations we\ndo not consider further decays of the quarks and of the gauge bosons.", "positive": "The Hill Theorem: It is studied how strong interactions in the Higgs sector can lead to\ndeviations in vector boson selfcouplings. Normally such effects are small due\nto Veltman's screening theorem. It is shown that strong interactions are\npossible, if there is a hierarchy of strong interactions in the Higgs sector.\nThis is called Hill's theorem." }, { "anchor": "Soft-gluon and Coulomb corrections to hadronic top-quark pair production\n beyond NNLO: We construct a resummation at partial next-to-next-to-next-to-leading\nlogarithmic accuracy for hadronic top-quark pair production near partonic\nthreshold, including simultaneously soft-gluon and Coulomb corrections, and use\nthis result to obtain approximate next-to-next-to-next-to-leading order\npredictions for the total top-quark pair-production cross section at the LHC.\nWe generalize a required one-loop potential in non-relativistic QCD to the\ncolour-octet case and estimate the remaining unknown two-loop potentials and\nthree-loop anomalous dimensions. We obtain a moderate correction of $1.5\\%$\nrelative to the next-to-next-to-leading order prediction and observe a\nreduction of the perturbative uncertainty below $\\pm 5\\%$.", "positive": "On bound states of multiple t-quarks due to Higgs exchange: Froggatt, Nielsen et al suggested that the Higgs boson exchange between top\nquarks produces enough attraction to generate their multiple bound states.\nFurthermore they claimed that the system of 6 top and 6 anti-top quarks is\nbound so strongly that the binding energy nearly compensates the masses of\nt-quarks, making it very light. We calculated the energy of such states more\naccurately, variationally and by self-consistent mean field approximation, and\nfound that these state are weakly bound for massless Higgs boson and unbound\nwith the account for its mass." }, { "anchor": "Sensitivity and constraints to the 2HDM soft-breaking $Z_2$ parameter\n $m_{12}$: In this letter we study the specific sensitivity and constraints to the soft\nbreaking $Z_2$ parameter $m_{12}$ of the Two Higgs Doublet Model (2HDM).\n$m_{12}$ is considered here as an input parameter of the model together with\nthe masses of the Higgs bosons, $m_h$, $m_H$, $m_A$, $m_{H^\\pm}$, the ratio of\nthe two Higgs vacuum expectation values, $\\tan \\beta$, and\n$\\cos(\\beta-\\alpha)$, with $\\alpha$ and $\\beta$ the mixing angles of the\n$\\mathcal{CP}$-even and $\\mathcal{CP}$-odd Higgs sector, respectively. We\nexplore in particular the sensitivity to $m_{12}$ in the decays of the lightest\nHiggs boson $h$ to two photons, assuming: 1) that $h$ is the state observed at\nthe LHC at $\\sim 125 \\ \\mathrm{GeV}$, and 2) the $h$ couplings to the SM\nparticles are SM-like, by going to the alignment limit, $\\cos(\\beta-\\alpha) =\n0$. The aim of this work is to demonstrate possible constraints on $m_{12}$\nfrom the present measurement of the di-photon signal strength, $\\mu_{\\gamma\n\\gamma}$. These constraints are relevant in the region of the 2HDM parameter\nspace that is allowed by all the other constraints, specifically, theoretical\nconstraints as well as experimental constraints from LHC Higgs rate\nmeasurements, Higgs boson searches, flavor physics and precision observables.\nThe exploration is performed in the four different Yukawa types of 2HDM, where\nthe allowed region by all the other constraints depends on the model type. We\nalso analyze the case that the Higgs-boson mass spectrum accommodates a\npossible new world average of $m_W$ including the recent CDF measurement.", "positive": "From Effective Lagrangians, to Chiral Bags, to Skyrmions with the\n Large-N_c Renormalization Group: We explicitly relate effective meson-baryon Lagrangian models, chiral bags,\nand Skyrmions in the following way. First, effective Lagrangians are\nconstructed in a manner consistent with an underlying large-N_c QCD. An\ninfinite set of graphs dress the bare Yukawa couplings at *leading* order in\n1/N_c, and are summed using semiclassical techniques. What emerges is a picture\nof the large-N_c baryon reminiscent of the chiral bag: hedgehog pions for r >\n1/\\Lambda patched onto bare nucleon degrees of freedom for r < 1/\\Lambda, where\nthe ``bag radius'' 1/\\Lambda is the UV cutoff on the graphs. Next, a novel\nrenormalization group (RG) is derived, in which the bare Yukawa couplings,\nbaryon masses and hyperfine baryon mass splittings run with \\Lambda. Finally,\nthis RG flow is shown to act as a *filter* on the renormalized Lagrangian\nparameters: when they are fine-tuned to obey Skyrme-model relations the\ncontinuum limit \\Lambda --> \\infty exists and is, in fact, a Skyrme model;\notherwise there is no continuum limit." }, { "anchor": "Accidental permutation symmetries as a test for Grand Unification: the\n supersymmetric $SU(5)$ case: Unification of matter fields implies the existence of accidental permutation\nsymmetries, which potentially remain immune to large quantum corrections up to\nthe TeV scale. We investigate the case of a supersymmetric $SU(5)$ grand\nunified theory, where such a permutation symmetry is present in the up-type\nsquark sector. We present a variety of tests allowing to challenge the $SU(5)$\nhypothesis based on the observation of squarks at the LHC. These tests appear\nas relations among observables involving flavour-violating or\nchirality-flipping decays of squarks. Moreover, they rely on top-polarimetry\nand charm-tagging. As an example, we discuss the application to the scenario of\nNatural Supersymmetry, while more examples can be found in the related journal\npublications.", "positive": "A simple Dirac wave function for a Coulomb potential with linear\n confinement: A simple analytical solution is found to the Dirac equation for the\ncombination of a Coulomb potential with a linear confining potential. An\nappropriate linear combination of Lorentz scalar and vector linear potentials,\nwith the scalar part dominating, can be chosen to give a simple Dirac wave\nfunction. The binding energy depends only on the Coulomb strength, and is not\naffected by the linear potential. The method works for the ground state, or for\nthe lowest state with $l=j-{1/2}$, for any $j$." }, { "anchor": "Strategies to Identify Boosted Tops: We study techniques for identifying highly boosted top jets, where the\nsubsequent top decay products are not isolated. For hadronic boosted tops, we\nconsider variables which probe the jet substructure in order to reduce the\nbackground from QCD jets with large invariant mass. Substructure variables\nrelated to two-body kinematics are least sensitive to the modeling of parton\nshower, while those which involve multi-body kinematics may still have\ndiscrimination power. For leptonic boosted tops, we consider variables which\ncharacterize the separation between the lepton--although not isolated by\nconventional criterion--and the hadronic activity in the top jet. Such\nvariables are useful in reducing the backgrounds both from heavy-flavor jets\nand from accidental jet-lepton overlap. We give numerical estimates of the top\nidentification efficiency versus background rejection rate as a functions of\ncuts on these variables, and find that these variables offer additional useful\ninformation above invariant mass alone.", "positive": "Searching for Leptoquarks in electron-photon Collisions: We study the production of composite scalar leptoquarks in $e\\gamma$\ncolliders, and we show that an $e^+e^-$ machine operating in its $e\\gamma$ mode\nis the best way to look for these particles in $e^+e^-$ collisions, due to the\nhadronic content of the photon." }, { "anchor": "Semileptonic decays of charmed mesons in the effective action of QCD: Within the framework of phenomenological Lagrangians we construct the\neffective action of QCD relevant for the study of semileptonic decays of\ncharmed mesons. Hence we evaluate the form factors of D -> P(0^-) l^+ nu_l at\nleading order in the 1/N_C expansion and, by demanding their QCD-ruled\nasymptotic behaviour, we constrain the couplings of the Lagrangian. The\nfeatures of the model-independent parameterization of form factors provided and\ntheir relevance for the analysis of experimental data are pointed out.", "positive": "On the history of the PMNS Matrix... with today's perspective: The conceptual basis for understanding the interplay of neutrino mass and\nmixing for neutrino oscillations were paradoxically discussed in a period when\nthe prevailing view was that of massless neutrinos. The name of Bruno\nPontecorvo is associated to most of the components for this beautiful quantum\nphenomenon: muon-electron universality, different neutrino flavours, mismatch\nbetween weak interaction and mass eigenstates, neutrino oscillation\nphenomenology, including flavour and Majorana transitions." }, { "anchor": "Production of the (predicted) $K^*(4307)$ in $B$ decays: In this work we study the production of $K^*(4307)$ in $B$ decays by\ndetermining the $J/\\psi\\pi^{+(0)}K^{0}$ and $J/\\psi \\pi^- K^+$ invariant mass\ndistributions of the processes $B^+\\to J/\\psi \\pi^+\\pi^0 K^0$ and $B^+\\to\nJ/\\psi \\pi^+\\pi^- K^+$, respectively. Such $K^*(4307)$ has been recently\npredicted as a three-body state originated from the dynamics involved in the $K\nD\\bar D^*$ system, with the $KD$ subsystem forming the $D^{*}_{s0}(2317)$ in\nisospin 0, and the $D\\bar D^*$ subsystem generating the $X(3872)$ in isospin 0\nand the $Z_c(3900)$ in isospin 1. The hidden charm content of $K^*(4307)$\nfavors its decay to a state like $J/\\psi\\pi K$ and the study of $B$-decays with\nthese particles in their final states can constitute a way of finding\nexperimental evidences for such an exotic vector meson, whose width, in spite\nof its large mass, is still quite narrow (around 18 MeV).", "positive": "Flavor in Supersymmetry: Anarchy versus Structure: Future high-precision flavor experiments may discover a pattern of deviations\nfrom the standard model predictions for flavor-changing neutral current\nprocesses. One of the interesting questions that can be answered then will be\nwhether the flavor structure of the new physics is related to that of the\nstandard model or not. We analyze this aspect of flavor physics within a\nspecific framework: supersymmetric models where the soft breaking terms are\ndominated by gauge-mediation but get non-negligible contributions from\ngravity-mediation. We compare the possible patterns of non-minimally\nflavor-violating effects that arise if the gravity-mediated contributions are\nanarchical vs. the case that they are structured by a Froggatt-Nielsen\nsymmetry. We show that combining information on flavor and CP violation from\nmeson mixing and electric dipole moments is indicative for the flavor structure\nof gravity-mediation." }, { "anchor": "Collider physics with no PDFs: Measurements of Deep Inelastic Scattering (DIS) provide a powerful tool to\nprobe the fundamental structure of protons and other nuclei. The DIS cross\nsections can be expressed in terms of structure functions which are\nconventionally expressed in terms of parton distribution functions (PDFs) that\nobey the DGLAP evolution equations. However, it is also possible to formulate\nthe DGLAP evolution directly in terms of measurable DIS structure functions\nentirely sidestepping the need for introducing PDFs. We call this as the\nphysical-basis approach. In a global analysis one would thereby directly\nparametrize the (observable) structure functions -- not the (unobservable)\nPDFs. Ideally, with data constraints at fixed $Q^2$, the initial condition for\nthe evolution would be the same at each perturbative order (unlike for PDFs)\nand the approach thus provides a more clean test of the QCD dynamics.\n We first study a physical basis consisting of the structure functions $F_2$\nand $F_{\\rm L}$ in the fixed-flavour number scheme to the leading non-zero\norder in $\\alpha_s$. We show how to express the quark singlet and gluon PDFs in\nterms of $F_2$ and $F_{\\rm L}$ directly in momentum space which then leads to\nthe DGLAP evolution of the structure functions $F_2$ and $F_{\\rm L}$. In the\nsecond step we expand the physical basis to include six independent structure\nfunctions, which allows for a consistent global analysis. The steps towards NLO\naccuracy and the variable-flavour-number scheme are outlined. At NLO accuracy\n(when the scheme dependence of PDFs starts to play a part), we can take\nadvatage of the physical basis and express e.g. the Drell-Yan cross sections at\nthe LHC directly in terms of measurable DIS structure functions and thus\nwithout the scheme dependence.", "positive": "Pair Production in Rotating Electric Fields: We explore Schwinger pair production in rotating time-dependent electric\nfields using the real-time DHW formalism. We determine the time evolution of\nthe Wigner function as well as asymptotic particle distributions neglecting\nback-reactions on the electric field. Whereas qualitative features can be\nunderstood in terms of effective Keldysh parameters, the field rotation leaves\ncharacteristic imprints in the momentum distribution that can be interpreted in\nterms of interference and multiphoton effects. These phenomena may seed\ncharacteristic features of QED cascades created in the antinodes of a\nhigh-intensity standing wave laser field." }, { "anchor": "Spin structure of the nucleon on the light front: We briefly review the spin structure of the nucleon and show that it is best\nthought in the light-front formulation. We discuss in particular the\nlongitudinal and transverse spin sum rules, the proper definition of canonical\norbital angular momentum and the spin-orbit correlation.", "positive": "The interaction of dyons in the mean field approximation: The interaction of dyons in the mean field approximation is considered. The\nresult of interaction is the mass term for dyonic field in the effective\nLagrangian. Due to the mass term the profile function of dyon falls off\nexponentially at large distances." }, { "anchor": "$SU(4)$-Ward identities for QCD with restored chiral symmetry: Lattice studies of QCD at temperatures above the chiral restoration and QCD\nwith truncated low modes of the Dirac operator indicate approximate and\nexplicit $SU(4)$ degeneracies in hadron spectra, respectively. At the same\ntime, the QCD classical action and the path integral measure are not invariant\nunder $SU(4)$. Here we investigate $SU(4)$ transformations in the continuum\nlimit by deriving corresponding Ward identities. We show that, if there is a\ngap in low-lying modes of the Dirac operator the obtained $SU(4)$ Ward\nidentities are simplified and look like they would be if $SU(4)$ symmetry is\npreserved. Then, we discuss possible consequences for the quark matter at high\ntemperatures.", "positive": "Baryonic violation of R-parity from anomalous $U(1)_H$: Supersymmetric scenarios with R-parity conservation are becoming very\nconstrained due to the lack of missing energy signals, thus motivating those\nscenarios with R-parity violation. In view of this, we consider a\nsupersymmetric model with R-parity violation and extended by an anomalous\nhorizontal $U(1)_H$ symmetry, where a self-consistent framework with\nbaryon-number violation is achieved along with a proper supression for lepton\nnumber violating dimension-5 operators in order to keep a proton decay safe.\nWith the introduction of right-handed neutrinos both Dirac and Majorana masses\ncan be accommodated within this model. The implications for collider physics\nare discussed." }, { "anchor": "Interference effects in the $H(\\rightarrow \u03b3\u03b3) + 2$ jets\n channel at the LHC: We compute the interference between the resonant process $pp\\to H(\\rightarrow\n\\gamma\\gamma)+2 \\text{ jets}$ and the corresponding continuum background at\nleading order in QCD. For the Higgs signal, we include gluon fusion (GF) and\nvector boson fusion (VBF) production channels, while for the background we\nconsider all tree-level contributions, including pure EW effects (${\\cal\nO}(\\alpha_{QED}^4)$) and QCD contributions (${\\cal O}(\\alpha_{QED}^2\n\\alpha_{s}^2)$), plus the loop-induced gluon-initiated process. After\nconvolution with the experimental mass resolution, the main effect of the\ninterference is to shift the position of the mass peak, as in the inclusive GF\ncase studied previously. The apparent mass shift is small in magnitude but\nstrongly dependent on the Higgs width, potentially allowing for a measurement\nof, or bound on, the width itself. In the $H(\\rightarrow \\gamma\\gamma)+2 \\text{\njets}$ channel, the VBF and GF contributions generate shifts of opposite signs\nwhich largely cancel, depending on the sets of cuts used, to as little as 5 MeV\n(toward a lower Higgs mass). The small magnitude of the shift makes this\nchannel a good reference mass for measuring the inclusive mass shift of around\n60 MeV in the Standard Model.", "positive": "Effective Coupling Constant in Renormalization Group for the Quantum\n Electrodynamics: Effective coupling constant in quantum electrodynamics is investigated. A\npole appears in the effective coupling constant for the space-like momentum if\nit is calculated by perturbation. The pole can be eliminated by the analytic\nregularization. For QED the effective coupling constant is written in terms of\nthe scale parameter, $\\Lambda$, having the dimension of mass as in the case of\nQCD. $\\Lambda$ is determined by comparing with the experimental data. The\ncalculated result agrees with experiment with $\\Lambda\\approx 1.64\\times\n10^{47}$ GeV; it is very large but much smaller than the mass scale of Landau\nghost." }, { "anchor": "Holomorphic selection rules, the origin of the mu term, and thermal\n inflation: When an abelian gauge theory with integer charges is spontaneously broken by\nthe expectation value of a charge Q field, there remains a Z_Q discrete\nsymmetry. In a supersymmetric theory, holomorphy adds additional constraints on\nthe operators that can appear in the effective superpotential. As a result,\noperators with the same mass dimension but opposite sign charges can have very\ndifferent coupling strengths. In the present work we characterize the operator\nhierarchies in the effective theory due to holomorphy, and show that there\nexist simple relationships between the size of an operator and its mass\ndimension and charge. Using such holomorphy-induced operator hierarchies, we\nconstruct a simple model with a naturally small supersymmetric mu term. This\nmodel also provides a concrete realization of late-time thermal inflation,\nwhich has the ability to solve the gravitino and moduli problems of weak-scale\nsupersymmetry.", "positive": "The SM prediction of g-2 of the muon: We calculate (g-2)/2 of the muon, by improving the determination of the\nhadronic vacuum polarisation contribution, a_mu^{had,LO}, and its\nuncertainties. The different e+e- data sets for each exclusive (and the\ninclusive) channel are combined in order to obtain the optimum estimate of the\ncross sections and their uncertainties. QCD sum rules are evaluated in order to\nresolve an apparent discrepancy between the inclusive data and the sum of the\nexclusive channels. We conclude a_mu^{had,LO}=(683.1 +- 5.9_{exp} +- 2.0_{rad})\n10^{-10} which, when combined with the other contributions to (g-2)/2, is about\n3 sigma below the present world average measurement." }, { "anchor": "Correlation between the scaling factor of the yukawa coupling and cross\n section for the $e^+ e^- \\rightarrow hhf\\overline{f}$ ($f\\neq t$) in type-I\n 2HD: The objective of this study is to correlate the scaling factor of the\nStandard Model (SM) like Higgs boson and the cross section ratio of the process\n$e^+ e^- \\rightarrow hhf\\overline{f}$ where $f\\neq t$, normalized to SM\npredictions in the type I of the Two Higgs Doublet Model. All calculations have\nbeen performed at $\\sqrt{s}=500$ GeV and $1 \\leq \\tan{\\beta} \\leq 30$ for\nmasses $m_H = m_A = m_{H^\\pm} = 300GeV$ and $m_H=300$ GeV, $m_A=m_{H^\\pm}=500$\nGeV. The working scenario is by taking without alignment limit, that is\n$s_{\\beta-\\alpha}= 0.98$ and $s_{\\beta-\\alpha}= 0.99,$ $0.995$, which gives the\nenhancement in the cross section, particularly a few times greater than the\npredictions of the SM due to resonant-impacts of the additional heavy neutral\nHiggs bosons. This shows that enhancement in cross section occurs on leaving\nthe alignment i.e., $s_{\\beta-\\alpha}=1$, at which all the higgs that couple to\nvector bosons and fermions have the same values as in SM at tree level. A large\nvalue of enhancement factor is obtained at $s_{\\beta-\\alpha}= 0.98$ compared to\n$s_{\\beta-\\alpha}= 0.99,$ $0 .995$. Furthermore, the decrease in the\nenhancement factor is observed for the case when $m_H=300$ GeV,\n$m_A=m_{H^\\pm}=500$ GeV. The behavior of the scaling factor with $\\tan{\\beta}$\nis also studied, which shows that for large values of $\\tan\\beta$, the scaling\nfactor becomes equal to $s_{\\beta-\\alpha}$. Finally a convincing correlation is\nachieved by taking into account, the experimental and theoretical constraints\ne.g, perturbative unitarity, vacuum stability and electroweak oblique\nparameters.", "positive": "Casimir scaling, glueballs and hybrid gluelumps: Assuming that the Casimir scaling hypothesis is well verified in QCD, masses\nof glueballs and hybrid gluelumps (gluon with a point-like $c\\bar c$ pair) are\ncomputed within the rotating string formalism. In our model, two gluons are\nattached by an adjoint string in a glueball while the gluon and the colour\noctet $c\\bar c$ pair are attached by two fundamental strings in a hybrid\ngluelump. Masses for such exotic hadrons are computed with very few free\nparameters. These predictions can serve as a guide for experimental searches.\nIn particular, the ground state glueballs lie on a Regge trajectory and the\nlightest $2^{++}$ state has a mass compatible with some experimental\ncandidates." }, { "anchor": "Transversity in the chiral quark--soliton model and single spin\n asymmetries: A short review of single spin asymmetries in deep inelastic semi-inclusive\nprocesses, connected with prediction of chiral quark-soliton model for the\nnucleon transversity distributions, its possible theoretical understanding in\nthe framework of QCD-induced approach and arising difficulties is given.", "positive": "Three-point Energy Correlators in Hadronic Higgs Decays: We present the analytic calculation of the leading order three-point energy\ncorrelator (EEEC) in hadronic Higgs decays, including both gluon-initiated\nchannel $H\\rightarrow g g+X$ and quark-initiated channel $H\\rightarrow q\\bar\nq+X$. The phase space integration is evaluated directly using Mandelstam\nvariables $s_{ij}=(p_i+p_j)^2$, and the appearing square roots can be\nrationalized by either conformal ratios or celestial coordinate variables.\nThroughout the calculation, we observe the same transcendental function space\nas in $\\mathcal{N}=4$ super Yang-Mills (SYM) theory and $e^+e^-\\rightarrow\n\\text{ hadrons}$. Different infrared limits are also explored using the full\nanalytic result, offering the fixed-order data for EEEC factorization and\nresummation. Given its non-trivial shape dependence, the EEEC presents an\nexcellent opportunity to explore the dynamics of gluon jets originating from\nthe $H \\to gg$ decay channel at future lepton colliders." }, { "anchor": "QCD Tests in Proton-Antiproton Collisions: We review the status of QCD tests in high energy p-pbar collisions. Contents:\ni) Introduction ii) QCD in Hadronic Collisions iii) Jet Production iv) Heavy\nFlavour Production v) W and Z Production vi) Direct Photons.", "positive": "Yukawa-coupling corrections to scalar quark decays: Heavy squark decays into top and charginos or neutralinos could be an\nunexpected source of top quarks at hadron colliders. A detailed treatment of\nthese processes is necessary for a reliable calculation of both the top quark\nproduction cross-section and the standard top quark branching ratio in the\nMSSM. Along this line we compute the electroweak corrections to the sbottom\ndecays sbottom_a --> chargino_i top within the Yukawa coupling approximation.\nThe calculation of these higher order contributions requires renormalization of\nboth the bottom squark mixing angle and of tan(beta). This type of corrections\ngives the leading order electroweak effects at low and high tan(beta)." }, { "anchor": "Study of temporal quantum correlations in decohering B and K meson\n systems: In this work we study temporal quantum correlations, quantified by\nLeggett-Garg (LG) and LG-type inequalities, in the $B$ and $K$ meson systems.\nWe use the tools of open quantum systems to incorporate the effect of\ndecoherence which is quantified by a single phenomenological parameter. The\neffect of $CP$ violation is also included in our analysis. We find that the LG\ninequality is violated for both $B$ and $K$ meson systems, the violation being\nmost prominent in the case of $K$ mesons and least for $B_s$ system. Since the\nsystems with no coherence do not violate LGI, incorporating\n\\textit{decoherence} is expected to decrease the extent of violation of LGI and\nis clearly brought out in our results. We show that the expression for the LG\nfunctions depends upon an additional term, apart from the experimentally\nmeasurable meson transition probabilities. This term vanishes in the limit of\nzero decoherence. On the other hand, the LG-type parameter can be directly\nexpressed in terms of transition probabilities, making it a more appropriate\nobservable for studying temporal quantum correlations in neutral meson systems.", "positive": "Roper resonances in chiral quark models: We derive a method to calculate the multi-channel K matrix applicable to a\nbroad class of models in which mesons linearly couple to the quark core. The\nmethod is used to calculate pion scattering amplitudes in the energy region of\nlow-lying P11 and P33 resonances. A good agreement with experimental data is\nachieved if in addition to the elastic channel we include the $\\pi\\Delta$ and\n$\\sigma N$ ($\\sigma\\Delta$) channels where the $\\sigma$-meson models the\ncorrelated two-pion decay. We solve the integral equation for the K matrix in\nthe approximation of separable kernels; it yields a sizable increase of the\nwidths of the $\\Delta(1232)$ and the N(1440) resonances compared to the bare\nquark values." }, { "anchor": "Superconducting phases of strongly-interacting matter in large magnetic\n fields: The large magnetic fields of neutron stars and produced in heavy-ion\ncollisions motivate investigation into the response of strongly-interacting\nmatter to extreme magnetic forces beyond just theoretical interest.\nFurthermore, the varying temperature $T$, baryon chemical potential $\\mu_B$,\nand aforementioned magnetic fields $B$, of these systems leads to questions\nconcerning the phase structure of Quantum Chromodynamics (QCD) at large. At low\ntemperatures, superconducting phases become a possible candidate for the ground\nstate in the $\\mu_B$-$B$ plane. This thesis investigates two scenarios where\nthese phases emerge at $T=0$, with an emphasis on the type-II regime.\n Preceding the presentation of these works, the $\\mu_B$-$B$ plane of the QCD\nphase diagram is reviewed such that the results can be placed in the wider\ncontext of this plane.", "positive": "Factorization scheme and scale dependence in diffractive dijet\n production at low Q^2: We calculate diffractive dijet production in deep-inelastic scattering at\nnext-to-leading order of perturbative QCD, including contributions from direct\nand resolved photons, and compare our predictions to preliminary data from the\nH1 collaboration at HERA. We study how the cross section depends on the\nfactorization scheme and scale M_\\gamma at the virtual photon vertex for the\noccurrence of factorization breaking. The strong M_\\gamma-dependence, which is\npresent when only the resolved cross section is suppressed, is tamed by\nintroducing the suppression also into the initial-state NLO correction of the\ndirect part." }, { "anchor": "Explaining $h\\to\u03bc^\\pm\u03c4^\\mp$, $B\\to K^* \u03bc^+\u03bc^-$ and $B\\to K\n \u03bc^+\u03bc^-/B\\to K e^+e^-$ in a two-Higgs-doublet model with gauged\n $L_\u03bc-L_\u03c4$: The LHC observed so far three deviations from the Standard Model (SM)\npredictions in flavour observables: LHCb reported anomalies in $B\\to K^*\n\\mu^+\\mu^-$ and $R(K)=B\\to K \\mu^+\\mu^-/B\\to K e^+e^-$ while CMS found an\nexcess in $h\\to\\mu\\tau$. We show, for the first time, how these deviations from\nthe SM can be explained within a single well-motivated model: a\ntwo-Higgs-doublet model with gauged $L_\\mu-L_\\tau$ symmetry. We find that,\ndespite the constraints from $\\tau\\to\\mu\\mu\\mu$ and $B_s$--$\\overline{B}_s$\nmixing, one can explain $h \\to\\mu\\tau$, $B\\to K^* \\mu^+\\mu^-$ and $R(K)$\nsimultaneously, obtaining interesting correlations among the observables.", "positive": "More on triangular mass matrices for fermions: A direct proof is given here which shows that instead of 6 complex numbers,\nthe triangular mass matrix for each sector could just be expressed in terms of\n5 by performing a specific weak basis transformation, leading therefore to a\nnew textures for triangular mass matrices.\n Furthermore, starting with the set of 20 real parameters for both sectors, it\ncan shown that 6 redundant parameters can be removed by using the rephasing\nfreedom." }, { "anchor": "Binary Tetrahedral Flavor Symmetry: A study of the T' Model and its variants utilizing Binary Tetrahedral Flavor\nSymmetry. We begin with a description of the historical context and motivations\nfor this theory, together with some conceptual background for added clarity,\nand an account of our theory's inception in previous works. Our model endeavors\nto bridge two categories of particles, leptons and quarks, a unification made\npossible by the inclusion of additional Higgs particles, shared between the two\nfermion sectors and creating a single coherent system. This is achieved through\nthe use of the Binary Tetrahedral symmetry group and an investigation of the\nTribimaximal symmetry evidenced by neutrinos. Our work details perturbations\nand extensions of this T' Model as we apply our framework to neutrino mixing,\nquark mixing, unification, and dark matter. Where possible, we evaluate model\npredictions against experimental results and find excellent matching with the\natmospheric and reactor neutrino mixing angles, an accurate prediction of the\nCabibbo angle, and a dark matter candidate that remains outside the limits of\ncurrent tests. Additionally, we include mention of a number of unanswered\nquestions and remaining areas of interest for future study. Taken together, we\nbelieve these results speak to the promising potential of finite groups and\nflavor symmetries to act as an approximation of nature.", "positive": "Alpha_s(M_Z) from hadronic tau decays: We perform an extraction of alpha_s based on sum rules involving isovector\nhadronic tau decay data. The particular sum rules employed are constructed\nspecifically to suppress contributions associated with poorly known higher\ndimension condensates, and hence reduce theoretical systematic uncertainties\nassociated with the treatment of such contributions which are shown to be\npresent in earlier related analyses. Running our results from the n_f=3 to\nn_f=5 regime we find alpha_s(M_Z^2)=0.1187(16), in excellent agreement with the\nrecently updated global fit to electroweak data at the Z scale, 0.1191(27), and\nother high-scale direct determinations." }, { "anchor": "Effects of Lorentz violation through the $\u03b3e\\to W\u03bd_e$ process in\n the Standard Model Extension: Physics beyond the Fermi scale could show up through deviations of the gauge\ncouplings predicted by the electroweak Yang-Mills sector. This possibility is\nexplored in the context of the International Linear Collider (ILC) through the\nhelicity amplitudes for the gamma e -> W nu_e reaction to which contributes the\ntrilinear WWgamma coupling. The new physics effects on this vertex are\nparametrized in a model-independent fashion through an effective electroweak\nYang-Mills sector, which is constructed by considering two essentially\ndifferent sources of new physics. In one scenario, Lorentz violation will be\nconsidered exclusively as the source of new physics effects. This type of new\nphysics is considered in an extension of the Standard Model that is known as\nthe Standard Model Extension (SME), which is an effective field theory that\ncontemplates CPT and Lorentz violation in a model-independent fashion. Any\nsource of new physics that respects the Lorentz symmetry, will be considered\nwithin the general context of the well known Conventional Effective Standard\nModel (CESM) extension. Both the SME and the CESM descriptions include gauge\ninvariant operators of dimension higher than four, which, in general, transform\nas Lorentz tensors of rank higher than zero. Whereas in the former theory\nobserver Lorentz invariants are constructed by contracting these operators with\nconstant Lorentz tensors, in the latter the corresponding Lorentz invariant\ninteractions are obtained contracting such operators with products of the\nmetric tensor. We focus our study on the possibility of experimentally\ndistinguish both types of new physics effects on the WWgamma vertex. It is\nfound that for a new physics scale of the same order of magnitude and under\ndetermined circumstances, both types of new physics effects will be clearly\ndistinguished.", "positive": "Next-to-Leading Order SUSY-QCD Predictions for Associated Production of\n Gauginos and Gluinos: We present complete results of a next-to-leading order calculation of the\nproduction of gaugino-like charginos ($\\chargino$) and neutralinos\n($\\neutralino$) in association with gluinos ($\\gluino$) at hadron colliders,\nincluding the strong corrections from the exchange of colored particles and\nsparticles. Adopting a variety of models for the sparticle mass spectrum,\nincluding typical supergravity (SUGRA) models and a light gluino model, we\nprovide predictions for total and differential cross sections at the energies\nof the Fermilab Tevatron and CERN Large Hadron Collider (LHC)." }, { "anchor": "The use of Generative Adversarial Networks to characterise new physics\n in multi-lepton final states at the LHC: Semi-supervision in Machine Learning can be used in searches for new physics\nwhere the signal plus background regions are not labelled. This strongly\nreduces model dependency in the search for signals Beyond the Standard Model.\nThis approach displays the drawback in that over-fitting can give rise to fake\nsignals. Tossing toy Monte Carlo (MC) events can be used to estimate the\ncorresponding trials factor through a frequentist inference. However, MC events\nthat are based on full detector simulations are resource intensive. Generative\nAdversarial Networks (GANs) can be used to mimic MC generators. GANs are\npowerful generative models, but often suffer from training instability. We\nhenceforth show a review of GANs. We advocate the use of Wasserstein GAN (WGAN)\nwith weight clipping and WGAN with gradient penalty (WGAN-GP) where the norm of\ngradient of the critic is penalized with respect to its input. Following the\nemergence of multi-lepton anomalies, we apply GANs for the generation of\ndi-leptons final states in association with $b$-quarks at the LHC. A good\nagreement between the MC and the WGAN-GP generated events is found for the\nobservables selected in the study.", "positive": "Unified Model of D-Term Inflation: Hybrid inflation, driven by a Fayet-Iliopoulos (FI) D term, is an intriguing\ninflationary model. In its usual formulation, it however suffers from several\nshortcomings. These pertain to the origin of the FI mass scale, the stability\nof scalar fields during inflation, gravitational corrections in supergravity,\nas well as to the latest constraints from the cosmic microwave background. We\ndemonstrate that these issues can be remedied if D-term inflation is realized\nin the context of strongly coupled supersymmetric gauge theories. We suppose\nthat the D term is generated in consequence of dynamical supersymmetry\nbreaking. Moreover, we assume canonical kinetic terms in the Jordan frame as\nwell as an approximate shift symmetry along the inflaton direction. This\nprovides us with a unified picture of D-term inflation and high-scale\nsupersymmetry breaking. The D term may be associated with a gauged U(1)_B-L, so\nthat the end of inflation spontaneously breaks B-L in the visible sector." }, { "anchor": "Quantum Gravity Effect on The Time History of The Universe: The QCD phase transition exhibits different periods during the evolution time\nof the universe. We explore the cosmological implications of QCD phase\ntransition in the early universe, which was mainly full of QGP matter, through\nthe Friedmann equations. This is performed by studying the effect of GUP on the\nMIT bag model. The obtained modified MIT bag model alongside with the Friedmann\nequations are utilized to study the thermodynamical quantities in terms of the\nevolution time. The effect of GUP is set by inserting the parameter $\\alpha =\n10^{-5}\\hspace{0.03cm}GeV^{-1}$. It is found that, the GUP effect on the\nevolution time of the universe makes it shorter, i.e the time span of each\nphase takes shorter time to transfer to another phase than their corresponding\nones without GUP effect.", "positive": "Effective Higgs Lagrangian and Constraints on Higgs Couplings: Probing the properties of the discovered Higgs boson may tell us whether or\nnot it is the same particle as the one predicted by the Standard Model. To this\naim we parametrize deviations of the Higgs couplings to matter from the\nStandard Model by using the Higgs Effective Field Theory framework. Starting\nwith a general dimension-6 effective Lagrangian including both CP-even and\nCP-odd operators, and requiring that the operators do not introduce power\ndivergences in the oblique parameters, we reduce the number of independent\neffective couplings of the theory. This framework is then used to put updated\nconstraints on the effective couplings, using the latest Higgs rates data from\nthe Run-I of the ATLAS and CMS experiments, and electroweak precision data from\nLEP, SLC and Tevatron. We show that the current data is able to significantly\nconstrain the CP-even and some CP-odd operators of the effective Lagrangian." }, { "anchor": "Pion axioproduction: The Delta resonance contribution: The process of pion axioproduction, $aN\\to\\pi N$, with an intermediate\n$\\Delta$ resonance is analyzed using baryon chiral parturbation theory. The\n$\\Delta$ resonance is included in two ways: First, deriving the $a\\Delta\nN$-vertices, the axion is brought into contact with the resonance, and, second,\ntaking the results of $\\pi N$ elastic scattering including the $\\Delta$, it is\nimplicitly included in the form of a pion rescattering diagram. As a result,\nthe partial wave cross section of axion-nucleon scattering shows an enhancement\nin the energy region around the $\\Delta$ resonance. Because of the isospin\nbreaking, the enhancement is not as pronounced as previously anticipated.\nHowever, since the isospin breaking here is much milder than that for usual\nhadronic processes, novel axion search experiments might still exploit this\neffect.", "positive": "Neutron Dark Matter Decays: We analyse the discrepancy between the neutron lifetimes measured in the\nbottle and beam experiments. Following Fornal and Grinstein (Phys. Rev. Lett.\n120, 191801 (2018)) we propose an explanation of such a puzzle by the dark\nmatter channels of the neutron decay. However, unlike Fornal and Grinstein in\naddition to the dark matter decay channel n -> \\chi + e^- + e^+, where \\chi is\na dark matter Dirac fermion and (e^-e^+) is an electron--positron pair, we\nassume the existence of the dark matter channel n -> chi + \\nu_e + \\bar{\\nu}_e,\nwhere \\nu_e \\bar{\\nu}_e is the electron neutrino-antineutrino pair. This allows\nto describe the discrepancy between the measurements of the neutron lifetime\neven in case of an unobservability of the dark matter decay channel n -> \\chi +\ne^- + e^+, which may be below the reaction threshold. The existence of the\ncoupling n -> \\chi + e^- + e^+ can be observed experimentally by measuring\nelectron-neutron scattering e^- + n -> \\chi + e^- at very low electron\nenergies, induced with the strength as of the decay n -> \\chi + \\nu_e +\n\\bar{\\nu}_e$. We propose a gauge invariant quantum field theory model with\nSU_L(2)\\times U_R(1) \\times U_R'(1)\\times U''_L(1) symmetry for the UV\ncompletion of the effective (n\\chi \\ell \\bar{\\ell}) interaction, where\n\\ell(\\bar{\\ell}) is electron (positron) or neutrino(antineutrino)." }, { "anchor": "Transitional CP Violation in the MSSM and Electroweak Baryogenesis: Electroweak baryogenesis depends on the profile of the bubble wall created in\nthe first-order phase transition. It is pointed out that CP violation in the\nHiggs sector of the MSSM could become large enough to explain the baryon\nasymmetry. We confirm this by solving the equations of motion for the Higgs\nfields with the effective potential at the transition temperature. That is, we\npresent an example such that the transitional CP violation is realized and show\nthe possibility that the baryon asymmetry of the universe may be produced, if\nmarginally, by the $\\tau$ lepton interacting with the wall, when an explicit CP\nbreaking in the Higgs sector, which is consistent with experimental bounds, is\ninduced at the phase transition.", "positive": "Production of charmed pseudoscalar mesons in antiproton-proton\n annihilation: We study the production of charmed mesons (D, D_s) in antiproton-proton\nannihilation close to the reaction thresholds. The elementary charm production\nprocess is described by baryon exchange and in the constituent quark model,\nrespectively. Effects of the interactions in the initial and final states are\ntaken into account rigorously. The calculations are performed in close analogy\nto our earlier study on pbarp to KbarK by connecting the processes via SU(4)\nflavor symmetry. Our predictions for the DDbar production cross section are in\nthe order of 10^{-2} -- 10^{-1} mu b. They turned out to be comparable to those\nobtained in other studies. The cross section for a D_sD_s pair is found to be\nof the same order of magnitude despite the fact that its production in pbarp\nscattering requires a two-step process." }, { "anchor": "See-saw mechanism and four light neutrino state: A formal proof is given that in a see-saw type neutrino mass matrix with only\ntwo neutrino mass scales ($m_D \\ll m_R$) and the maximal rank of $m_{R(D)}$, we\ncan not get a fourth light sterile neutrino.", "positive": "S3 x Z2 model for neutrino mass matrices: We propose a model for lepton mass matrices based on the seesaw mechanism, a\ncomplex scalar gauge singlet and a horizontal symmetry $S_3 \\times\n\\mathbbm{Z}_2$. In a suitable weak basis, the charged-lepton mass matrix and\nthe neutrino Dirac mass matrix are diagonal, but the vacuum expectation value\nof the scalar gauge singlet renders the Majorana mass matrix of the\nright-handed neutrinos non-diagonal, thereby generating lepton mixing. When the\nsymmetry $S_3$ is not broken in the scalar potential, the effective\nlight-neutrino Majorana mass matrix enjoys $\\mu$--$\\tau$ interchange symmetry,\nthus predicting maximal atmospheric neutrino mixing together with $U_{e3} = 0$.\nA partial and less predictive form of $\\mu$--$\\tau$ interchange symmetry is\nobtained when the symmetry $S_3$ is softly broken in the scalar potential.\nEnlarging the symmetry group $S_3 \\times \\mathbbm{Z}_2$ by an additional\ndiscrete electron-number symmetry $\\mathbbm{Z}_2^{(e)}$, a more predicitive\nmodel is obtained, which is in practice indistinguishable from a previous one\nbased on the group $D_4$." }, { "anchor": "Charm meson production and double parton interactions at the LHC: We discuss production of open charm mesons in proton-proton collisions at the\nLHC. The cross section for inclusive production of $c \\bar c$ pairs is\ncalculated within the $k_{\\perp}$-factorization approach in which a major part\nof higher-order corrections is belived to be effectively included. We use and\ntest the applicability of several unintegrated gluon distributions. Numerical\nresults of the $k_{\\perp}$-factorization approach are compared to NLO pQCD\ncollinear predictions. Inclusive differential distributions in transverse\nmomentum and (pseudo)rapidity of several charmed mesons are presented and\ncompared to recent results of the ALICE, ATLAS and LHCb collaborations. We also\nexamine production of neutral charmed meson-antimeson pairs ($D^0 {\\overline\nD^0}$) in unique kinematics of forward rapidities of the LHCb experiment.\nKinematical correlations in azimuthal angle $\\varphi_{D^0 {\\overline D^0}}$,\ninvariant mass $M_{D^0 {\\overline D^0}}$ and rapidity difference $Y_{D^0\n{\\overline D^0}}$ distributions are calculated. Moreover, we also discuss\nproduction of two pairs of $c \\bar c$ within a simple formalism of\ndouble-parton scattering (DPS). We compare results of calculations of\nsingle-parton scattering (SPS) and double-parton scattering (DPS) for\nproduction of $c \\bar c c \\bar c$ and for $D^0-D^0$ meson-meson correlations.\nWe compare our predictions for double charm production with recent results of\nthe LHCb collaboration for azimuthal angle $\\varphi_{D^0 D^0}$ distribution,\ndimeson invariant mass $M_{D^0 D^0}$ and rapidity distance between mesons\n$Y_{D^0 D^0}$. The obtained results clearly certify the dominance of DPS in the\nproduction of events with double charm.", "positive": "Comprehensive Analysis on the Light Higgs Boson Scenario: Comprehensive analysis on the light Higgs scenario of the minimal\nsupersymmetric standard model is performed in the framework of the\nnon-universal Higgs mass model (NUHM). The NUHM is known to be the simplest\nframework realizing the light Higgs scenario with the unifications of gaugino\nand sfermion masses at the scale of grand unified theory being consistent. All\nimportant constraints from collider experiments, flavor-changing processes, and\ncosmological observations are considered in order to clarify the allowed region\nof the model parameter space, where the Markov Chain Monte Carlo method is used\nto obtain the region. We show that the region is excluded by current LHC\nresults for the SUSY particle searches. We discuss possible extensions to save\nthe LHS. Even with such extensions, the measurement of B_s to mu^+ mu^- would\nenable us to test the LHS in the near future." }, { "anchor": "The New Charm-Strange Resonances in the D^- K^+ Channel: We evaluate the masses and decay constants of the $0^+$ and $1^-$ open-charm\n$(\\bar{c}\\bar{d})(us)$ tetraquarks and molecular states from QCD spectral sum\nrules (QSSR) by using QCD Laplace sum rule (LSR). This method takes into\naccount the stability criteria where the factorized perturbative NLO\ncorrections and the contributions of quark and gluon condensates up to\ndimension-6 in the OPE are included. We confront our results with the $D^- K^+$\ninvariant mass recently reported by LHCb from $B^+ \\to D^+(D^- K^+)$ decays. We\nexpect that the resonance near the $D^- K^+$ threshold can be originated from\nthe $0^{+}(D^-K^+)$ molecule and/or $D^- K^+$ scattering. The $X_0(2900)$\nscalar state and the resonance $X_J(3150)$ (if $J = 0$) can emerge from a\nminimal mixing model, with a tiny mixing angle $\\theta_0 \\simeq (5.2 \\pm\n1.9)^0$, between a scalar Tetramole $({\\cal T}_{\\!\\!{\\cal M}0})$ (superposition\nof nearly degenerated hypothetical molecules and compact tetraquarks states\nwith the same quantum numbers), having a mass $M_{{\\cal T}_{\\!\\!{\\cal M}0}} =\n2743(18)$ MeV, and the first radial excitation of the $D^- K^+$ molecule with\nmass $M_{(DK)_1} = 3678(310)$ MeV. In an analogous way, the $X_1(2900)$ and the\n$X_J(3350)$ (if $J = 1$) could be a mixture between the vector Tetramole\n$({\\cal T}_{\\!\\!{\\cal M}1})$, with a mass $M_{{\\cal T}_{\\!\\!{\\cal M}1}} =\n2656(20)$ MeV, and its first radial excitation having a mass $M_{{\\cal\nT}_{\\!\\!{\\cal M}1}} = 4592(141)$ MeV with an angle $\\theta_0 \\simeq (9.1 \\pm\n0.6)^0$. A (non)-confirmation of these statements requires experimental\nfindings of the quantum numbers of the resonances at $3150$ and $3350$ MeV.", "positive": "K*-couplings for the antidecuplet excitation: We estimate the coupling of the K* vector meson to the N-->Theta+ transition\nemploying unitary symmetry, vector meson dominance, and results from the GRAAL\nCollaboration for eta photoproduction off the neutron. Our small numerical\nvalue for the coupling constant is consistent with the non-observation of the\nTheta+ in recent CLAS searches for its photoproduction. We also estimate the\nK*-coupling for the N-->Sigma* excitation, with Sigma* being the Sigma-like\nantidecuplet partner of the Theta+-baryon." }, { "anchor": "Dynamical Mass Generations and Collective Excitations in the\n (Supersymmetric-)Nambu$-$Jona-Lasinio Model and a Gauge Theory with\n Left-Right-Asymmetric Majorana Mass Terms: The structure of effective potential surface of the Nambu$-$Jona-Lasinio\n(NJL) model with right-left asymmetric Majorana mass terms (corresponds to the\nsingle-flavor type-II seesaw situation of neutrino) is investigated. After the\ndynamical generation of Dirac mass, two collective modes appear similar to the\ncase of ordinary NJL model, and the phase mode (phason), which corresponds to\nmajoron or pion at vanishing Majorana mass parameter(s), has an excitation\nmass. The mechanism of generation of phason as a pseudo Nambu-Goldstone boson\nis examined by a mathematical manner, summarized into a theorem\n (claims as the generalized Nambu-Goldstone theorem). The mass of phason is\nalso evaluated in a supersymmetric version of the NJL-type model, and phason\nmass takes the order of that of axion commonly accepted today. An\n$SU(2_{c})$-gauge model is constructed for the context of neutrino seesaw\nmechanism, and the Schwinger-Dyson equation of dynamical mass functions is\nexamined. Several physical implications such as decay modes of phason, a\nnon-linear sigma model for phason are given. It is proposed that the\nmethod/result of this paper can be applied to an understanding on the origin of\nthe Kobayashi-Maskawa matrix.", "positive": "Chiral magnetic wave at finite baryon density and the electric\n quadrupole moment of quark-gluon plasma in heavy ion collisions: Chiral Magnetic Wave (CMW) is a gapless collective excitation of quark-gluon\nplasma in the presence of external magnetic field that stems from the interplay\nof Chiral Magnetic (CME) and Chiral Separation Effects (CSE); it is composed by\nthe waves of the electric and chiral charge densities coupled by the axial\nanomaly. We consider CMW at finite baryon density and find that it induces the\nelectric quadrupole moment of the quark-gluon plasma produced in heavy ion\ncollisions: the \"poles\" of the produced fireball (pointing outside of the\nreaction plane) acquire additional positive electric charge, and the \"equator\"\nacquires additional negative charge. We point out that this electric quadrupole\ndeformation lifts the degeneracy between the elliptic flows of positive and\nnegative pions leading to $v_2(\\pi^+) < v_2(\\pi^-)$, and estimate the magnitude\nof the effect." }, { "anchor": "Anomaly-free constraints in neutrino seesaw models: The implementation of seesaw mechanisms to give mass to neutrinos in the\npresence of an anomaly-free U(1)_X gauge symmetry is discussed in the context\nof minimal extensions of the standard model. It is shown that type-I and\ntype-III seesaw mechanisms cannot be simultaneously implemented with an\nanomaly-free local U(1)_X, unless the symmetry is a replica of the well-known\nhypercharge. For combined type-I/II or type-III/II seesaw models it is always\npossible to find nontrivial anomaly-free charge assignments, which are however\ntightly constrained, if the new neutral gauge boson is kinematically accessible\nat LHC. The discovery of the latter and the measurement of its decays into\nthird-generation quarks, as well as its mixing with the standard Z boson, would\nallow one to discriminate among different seesaw realizations.", "positive": "Medium induced gluon spectrum in the Improved Opacity Expansion: Over the last decades, analytical calculations of jet quenching observables\nhave always needed to make a distinction between dense or dilute mediums.\nAlthough there are different theoretical formalisms suited for each one of\nthese scenarios, taking into account multiple soft and single hard interactions\nbetween the probe and the background under a single approach has proven to be a\ndifficult task. In this talk, we will introduce the Improved Opacity Expansion\n(IOE), which extends the well established Opacity Expansion framework beyond\nthe hard momentum transfer tail, including the regime captured by the\nBDMPS-Z/ASW approximation. We will focus on the application of the IOE to the\ncomputation of the single gluon medium induced spectrum from a hard parton,\nwhich constitutes one of the most important theoretical results in jet\nquenching theory." }, { "anchor": "Momentum Broadening in an Anisotropic Plasma: The rates governing momentum broadening in a quark-gluon plasma with a\nmomentum anisotropy are calculated to leading-log order for a heavy quark using\nkinetic theory. It is shown how the problematic singularity for these rates at\nleading-oder is lifted by next-to-leading order gluon self-energy corrections\nto give a finite contribution to the leading-log result. The resulting rates\nare shown to lead to larger momentum broadening along the beam axis than in the\ntransverse plane, which is consistent with recent STAR results. This might\nindicate that the quark-gluon-plasma at RHIC is not in equilibrium.", "positive": "Spectroscopy at B-factories Using Hard Photon Emission: The process of hard photon emission by initial electrons (positrons) at\nB-factories is discussed. It is shown that studies of the bottomonium\nspectroscopy will be feasible for the planned integrated luminosity of the\nB-factory experiments." }, { "anchor": "The Anisotropies and Origins of Ultrahigh Energy Cosmic Rays: IceCube detects more than 100,000 neutrinos per year in the GeV- to\nPeV-energy range. Among those, we have isolated a flux of high-energy cosmic\nneutrinos. I will discuss the instrument, the analysis of the data, the\nsignificance of the discovery of cosmic neutrinos, and the recent\nmulti-messenger observation of a flaring TeV blazar in coincidence with the\nIceCube neutrino alert IC170922.", "positive": "Exclusive Radiative Z-Boson Decays to Mesons with Flavor-Singlet\n Components: We present a detailed study of the exclusive radiative decays\n$Z\\to\\eta^{(\\prime)}\\gamma$ employing the QCD factorization approach. We derive\na factorization formula for the decay amplitudes valid at leading power in an\nexpansion in $(\\Lambda_{QCD}/m_Z)^2$, which includes convolutions of calculable\nhard-scattering kernels with the leading-twist quark and gluon light-cone\ndistribution amplitudes of the mesons. Large logarithms arising in the\nevolution from the high scale $m_Z$ down to hadronic scales are resummed using\nthe renormalization group, carefully accounting for the effects of the heavy\nbottom and charm quarks. Our results for the branching ratios are very\nsensitive to hadronic input parameters, such as the decay constants and mixing\nangle characterizing the $\\eta-\\eta'$ system. Using the most recent estimates\nof these parameters, we obtain the branching ratios $Br(Z\\to\\eta\\gamma)\\sim\n1.6\\cdot 10^{-10}$ and $Br(Z\\to\\eta'\\gamma)\\sim 4.7\\cdot 10^{-9}$. A\nmeasurement of these processes at a future high-luminosity Z factory could\nprovide interesting information on the gluon distribution amplitude." }, { "anchor": "Adler function and hadronic contribution to the muon g-2 in a nonlocal\n chiral quark model: The behavior of the vector Adler function at spacelike momenta is studied in\nthe framework of a covariant chiral quark model with instanton-like quark-quark\ninteraction. This function describes the transition between the high energy\nasymptotically free region of almost massless current quarks to the low energy\nhadronized regime with massive constituent quarks. The model reproduces the\nAdler function and V-A correlator extracted from the ALEPH and OPAL data on\nhadronic \\tau lepton decays, transformed into the Euclidean domain via\ndispersion relations. The leading order contribution from hadronic part of the\nphoton vacuum polarization to the anomalous magnetic moment of the muon,\na_\\mu^{hvp,1}, is estimated.", "positive": "B and B_s decay constants from QCD Duality at three loops: Using special linear combinations of finite energy sum rules which minimize\nthe contribution of the unknown continuum spectral function, we compute the\ndecay constants of the pseudoscalar mesons B and B_s. In the computation, we\nemploy the recent three loop calculation of the pseudoscalar two-point function\nexpanded in powers of the running bottom quark mass. The sum rules show\nremarkable stability over a wide range of the upper limit of the finite energy\nintegration. We obtain the following results for the pseudoscalar decay\nconstants: f_B=178 \\pm 14 MeV and f_{B_s}=200 \\pm 14 MeV. The results are\nsomewhat lower than recent predictions based on Borel transform, lattice\ncomputations or HQET. Our sum rule approach of exploiting QCD quark hadron\nduality differs significantly from the usual ones, and we believe that the\nerrors due to theoretical uncertainties are smaller." }, { "anchor": "Electrweak Z-string And $\\tan\u03b2$: In the standard model with two Higgs doublets it is shown that the existence\nof the electroweak Z-string in general requires the same characteristic length\nfor the two Higgs fields as well as a specific ratio of the two Higgs vacuum\nexpectation values, i.e. $\\tan\\beta$. This ratio can be determined in terms of\nthe couplings in the Higgs potential. Some remarks on the supersymmetric case\nare given. \\noindent (Talk presented at SUSY '93, March 29-April 1st,\nNortheastern University, Boston, MA 02115, USA.)", "positive": "Establishing the Range of Applicability of Hydrodynamics in High-Energy\n Collisions: We simulate the space-time dynamics of high-energy collisions based on a\nmicroscopic kinetic description in the conformal relaxation time approximation,\nin order to determine the range of applicability of an effective description in\nrelativistic viscous hydrodynamics. We find that hydrodynamics provides a\nquantitatively accurate description of collective flow when the average inverse\nReynolds number is sufficiently small and the early pre-equilibrium stage is\nproperly accounted for. We further discuss the implications of our findings for\nthe (in)applicability of hydrodynamics in proton-proton, proton-nucleus and\nlight nucleus collisions." }, { "anchor": "IceCube constraints on Violation of Equivalence Principle: Among the information provided by high energy neutrinos, a promising\npossibility is to analyze the effects of a Violation of Equivalence Principle\n(VEP) on neutrino oscillations. We analyze the recently released IceCube data\non atmospheric neutrino fluxes under the assumption of a VEP and obtain updated\nconstraints on the parameter space with the benchmark choice that neutrinos\nwith different masses couple with different strengths to the gravitational\nfield. In this case we find that the VEP parameters times the local\ngravitational potential at Earth can be constrained at the level of $10^{-27}$.\nWe show that the constraints from atmospheric neutrinos strongly depend on the\nassumption that the neutrino eigenstates interacting diagonally with the\ngravitational field coincide with the mass eigenstates, which is not \\textit{a\npriori} justified: this is particularly clear in the case that the basis of\ndiagonal gravitational interaction coincide with the flavor basis, which cannot\nbe constrained by the observation of atmospheric neutrinos. Finally, we\nquantitatively study the effect of a VEP on the flavor composition of the\nastrophysical neutrinos, stressing again the interplay with the basis in which\nthe VEP is diagonal: we find that for some choices of such basis the flavor\nratio measured by IceCube can significantly change.", "positive": "On the Factorial Moment Analysis of High Energy Experimental Data with\n Non-integer Partition Number: It is pointed out that in doing the factorial moment analysis with\nnon-integer partition $M$ of phase space, the influence of the phase-space\nvariation of two- (or more-) particle correlations has to be considered\ncarefully. In this paper this problem is studied and a systematic method is\ndeveloped to minimize this influence. The efficiency and self-consistency of\nthis method are shown using the data of 250 GeV/$c$ $\\pi^+$p and K$^+$p\ncollisions from the NA22 experiment as example." }, { "anchor": "Gravitational Wave Signatures of Gauged Baryon and Lepton Number: We demonstrate that novel types of gravitational wave signatures arise in\ntheories with new gauge symmetries broken at high energy scales. For\nconcreteness, we focus on models with gauged baryon number and lepton number,\nin which neutrino masses are generated via the type I seesaw mechanism,\nleptogenesis occurs through the decay of a heavy right-handed neutrino, and one\nof the new baryonic fields is a good dark matter candidate. Depending on the\nscalar content of the theory, the gravitational wave spectrum consists of\ncontributions from cosmic strings, domain walls, and first order phase\ntransitions. We show that a characteristic double-peaked signal from domain\nwalls or a sharp domain wall peak over a flat cosmic string background may be\ngenerated. Those new signatures are within the reach of future experiments,\nsuch as Cosmic Explorer, Einstein Telescope, DECIGO, Big Bang Observer, and\nLISA.", "positive": "Nonperturbative QCD Effects in Inclusive B Decays: In this talk I report calculable nonperturbative QCD effects to the inclusive\nsemileptonic and radiative B-meson decay rates. Small instantons contribute to\nthe Wilson coefficient functions at scales below $m_b$. It is found that the\ninstantons give rise to a potentially large correction to the decay rate near\nthe boundaries of the phase space for the semileptonic decay case, but totally\nnegligible for the radiative case. I explain how the difference may be\nunderstood as a simple consequence of different kinematics in the two cases.\n{Talk Presented at IFT Workshop on Yukawa Couplings and the Origin of Mass\n University of Florida, Gainesville, Feb. 11-13, 1994\n Proceeding to be Published by International Press, 15 pages (LATEX)\n 5 Postscript figures available upon request,\n International Press macro file ip-author.sty appended}" }, { "anchor": "Single top production associated with a neutral scalar at LHC in\n topcolor-assisted technicolor: The topcolor-assisted technicolor (TC2) model predicts a number of neutral\nscalars like the top-pion ($\\pi^0_t$) and the top-Higgs ($h^0_t$). These\nscalars have flavor-changing neutral-current (FCNC) top quark couplings, among\nwhich the top-charm transition couplings may be sizable. Such FCNC couplings\ninduce single top productions associated with a neutral scalar at the CERN\nLarge Hadron Collider (LHC) through the parton processes $cg \\to t \\pi_t^0$ and\n$cg \\to t h_t^0$. In this note we examine these productions and find their\nproduction rates can exceed the $3\\sigma$ sensitivity of the LHC in a large\npart of parameter space. Since in the Standard Model and the minimal\nsupersymmetric model such rare productions have unobservably small production\nrates at the LHC, these rare processes will serve as a good probe for the TC2\nmodel.", "positive": "Proton-nucleus cross section at high energies: Cross sections for proton inelastic collision with different nuclei are\ndescribed within the Glauber and multiple scattering approximations. A\nsignificant difference between approximate `Glauber' formula and exact\ncalculations with a geometrical scaling assumption for very high-energy cross\nsection is shown. Experimental values of proton-proton cross sections obtained\nusing extensive air shower data are based on the relationship of proton-proton\nand respective proton-air absorption cross sections. According to obtained\nresults values reported by the Akeno and Fly's Eye experimental groups are\nabout 10% overestimated. The proper energy dependence of absorption cross\nsection for collisions with air nuclei is of a great importance for studies of\nhigh energy cosmic rays using the Monte Carlo technique." }, { "anchor": "The ${\\bar c} c$ purity of $\u03c8(3770)$ and $\u03c8'$ challenged: It is suggested that the resonance $\\psi(3770)$ may contain a sizeable\n($O(10%)$ in terms of the probability weight factor) four-quark component with\nthe up- and down- quarks and antiquarks in addition to the $c {\\bar c}$ pair,\nwhich component in itself has a substantial part with the isospin I=1.\nFurthermore such four-quark part of the wave function should also affect the\nproperties of the $\\psi'$ charmonium resonance through the $\\psi(3770) - \\psi'$\nmixing previously considered in the literature. It is argued that an admixture\nof extra light quark pairs can explain a possible discrepancy between the\ntheoretical expectations and the recent data on the non-$D {\\bar D}$ decay\nwidth of the $\\psi(3770)$ and the ratio of the yield of charged and neutral $D$\nmeson pairs in its decays, as well as on the extra rate of the $\\psi'$ direct\ndecay into light hadrons and the rate of the decay $\\psi' \\to \\pi^0 J/\\psi$. It\nis further argued that the suggested four-quark component of the wave function\nof the $\\psi(3770)$ should give rise to a measurable rate of the decays\n$\\psi(3770) \\to \\eta J/\\psi$ and $\\psi(3770) \\to \\pi^0 J/\\psi$.", "positive": "Radion-higgs mixing state at the LHC with the KK contributions to the\n production and decay: In this paper we study the higgs-radion system of the Randall-Sundum model\nwhere matter and gauge fields live in the bulk. We take into account the\nKalza-Klein(KK) loop correction for the higgs and the raidion coupling to the\ngauge bosons. Inspired by the LHC data in 2011 where a sign of the higgs boson\nhas been seen at 125 GeV, we fix the one of the mass eigenstate of the\nhiggs-radion mixed state at 125 GeV, and scan over all the other parameters\nwhich have not been excluded by the 2011's data. We find the region of\nparameters where the scalar particle at 125 GeV have branching ratio larger or\nsmaller than that of the Standard Model(SM) higgs significantly. The predicted\nratio Br(ZZ)/Br(gamma gamma) also may be different from that of the SM higgs\nboson." }, { "anchor": "Chiral Magnetic Effect from Q-balls: We apply a generic framework of linear sigma models for revealing a mechanism\nof the mysterious phenomenon, the chiral magnetic effect, in quark-gluon\nplasma. An electric current arises along a background magnetic field, which is\ngiven rise to by Q-balls (non-topological solitons) of the linear sigma model\nwith axial anomaly. We find additional alternating current due to quark mass\nterms. The hadronic Q-balls, baby boson stars, may be created in heavy-ion\ncollisions.", "positive": "Small size pentaquark width: calculation in QCD sum rules: The pentaquark width is calculated in QCD sum rules. The higher dimension\noperators contribution is accounted. It is shown, that $\\Gamma_{\\Theta}$ should\nbe very small, less than $1Mev$." }, { "anchor": "Temperature oscillations and sound waves in hadronic matter: Recent high energy CERN LHC experiments on transverse momenta distributions\nof produced particles seem to show the existence of some (small but persistent)\nlog-periodic oscillation in the ratios $R = \\sigma_{data}\\left(\np_T\\right)/\\sigma_{fit}\\left( p_T\\right)$. We argue that they can provide us\nwith so far unnoticed information on the production process, which can be\ninterpreted as the presence of some kind of sound waves formed during the\ncollision process in the bulk of the produced high density matter.", "positive": "Flavor asymmetry of polarized and unpolarized sea quark distributions in\n the large-N_c limit: We summarize recent attempts to calculate the flavor asymmetry of the\nnucleon's sea quark distributions in the large-$N_c$ limit, where the nucleon\ncan be described as a soliton of an effective chiral theory. We discuss the\nleading-twist longitudinally polarized and transversity antiquark\ndistributions, $\\Delta\\bar u (x) - \\Delta\\bar d (x)$ and $\\delta\\bar u (x) -\n\\delta\\bar d (x)$, as well as the unpolarized one, $\\bar u (x) - \\bar d (x)$,\nwhich appears only in the next-to-leading order of the $1/N_c$-expansion.\nResults for $\\bar u (x) - \\bar d (x)$ are in good agreement with the recent\nDrell-Yan data from the FNAL E866 experiment. The longitudinally polarized\nantiquark asymmetry, $\\Delta\\bar u (x) - \\Delta\\bar d (x)$, is found to be\nlarger than the unpolarized one." }, { "anchor": "Supersymmetric Inflation with the Ordinary Higgs?: We consider a model of D-term inflation in which the inflaton coincides with\nthe standard Higgs doublet. Non-renormalizable terms are controlled by a\ndiscrete R-symmetry of the superpotential. We consider radiative corrections to\nthe scalar potential and find that Higgs inflation in the slow-roll\napproximation is viable and consistent with CMB data, although with a rather\nlarge value of the non-renormalizable coupling involved.", "positive": "Implications of the new CDF-II $W$-boson mass on two-Higgs-doublet\n models: We present the implications of the recent measurement of $W$ boson at CDF II\non the two-Higgs-doublet model (2HDM). In the analysis, we impose theoretical\nbounds such as vacuum stability and perturbative unitarity, and several\nexperimental constraints. In addition, we take into account the measurement of\n$\\sin^2\\theta_W(m_Z)_{\\rm \\bar{MS}}$ on top of the CDF $W$-boson mass to\ninvestigate how the $S$ and $T$ parameters are determined. We explore two\npossible scenarios depending on whether the Higgs boson observed at the LHC is\nthe lighter or heavier of $CP$-even neutral Higgs bosons for 2HDM type I and\nII. Using the results, we show how the parameter space is constrained, and\ncompare it with the one based on the PDG average of $m_W$. Furthermore, we\nexplore phenomenological consequences of electroweak precision observables that\ncan be affected by $m_W$ within the predictions of the 2HDM, and the reduction\nin parameter space expected from future measurements at the Future Circular\nLepton Collider." }, { "anchor": "Heavy Quarks in the Quark-Gluon Plasma: Heavy-flavor particles are believed to provide valuable probes of the medium\nproduced in ultrarelativistic collisions of heavy nuclei. In this article we\nreview recent progress in our understanding of the interactions of charm and\nbottom quarks in the Quark-Gluon Plasma (QGP). For individual heavy quarks, we\nfocus on elastic interactions for which the large quark mass enables a Brownian\nmotion treatment. This opens a unique access to thermalization mechanisms for\nheavy quarks at low momentum, and thus to their transport coefficients in the\nquark-gluon fluid. Different approaches to evaluate heavy-quark diffusion are\ndiscussed and compared, including perturbative QCD, effective potential models\nutilizing input from lattice QCD and string-theoretic estimates in conformal\nfield theories. Applications to heavy-quark observables in heavy-ion collisions\nare realized via relativistic Langevin simulations, where we illustrate the\nimportant role of a realistic medium evolution to quantitatively extract the\nheavy-quark diffusion constant. In the heavy quarkonium sector, we briefly\nreview the current status in potential-model based interpretations of\ncorrelation functions computed in lattice QCD, followed by an evaluation of\nquarkonium dissociation reactions in the QGP. The discussion of the\nphenomenology in heavy-ion reactions focuses on thermal model frameworks\nparalleling the open heavy-flavor sector. We also emphasize connections to the\nheavy-quark diffusion problem in both potential models and quarkonium\nregeneration processes.", "positive": "Quark to $\u039b$-hyperon spin transfers in the current-fragmentation\n region: We perform a study on the struck quark to the $\\Lambda$-hyperon fragmentation\nprocesses by taking into account the anti-quark fragmentations and intermediate\ndecays from other hyperons. We concentrate on how the longitudinally polarized\nquark fragments to the longitudinally polarized $\\Lambda$, how unpolarized\nquark and anti-quark fragment to the unpolarized $\\Lambda$, and how quark and\nanti-quark fragment to the $\\Lambda$ through the intermediate decay processes.\nWe calculate the effective fragmentation functions in the light-cone SU(6)\nquark-spectator-diquark model via the Gribov-Lipatov relation, with the\nMelosh-Wigner rotation effect also included. The calculated results are in\nreasonable agreement with the HERMES semi-inclusive $ep$ experimental data and\nthe OPAL and ALEPH $e^{+}e^{-}$ annihilation experimental data." }, { "anchor": "Rare top quark decays in the minimal R-symmetric supersymmetric standard\n model: The one-loop contributions to the flavor changing neutral current decays of\nthe top quark into a light quark and a gauge boson or Higgs boson:\n$t\\rightarrow qV,qh$, with $q$ = $u$ or $c$, $V$ = $\\gamma$, $g$ or $Z$, are\nanalyzed in this work in the framework of the minimal R-symmetric\nsupersymmetric standard model. The numerical results show that the gluino or\n$\\rho$-chargino dominates the predictions on BR($t\\rightarrow qV,qh$), and the\ncontributions from neutralino or $\\chi$-chargino are insignificant. Taking\naccount of the constraints on the squark mixing parameters from\n$\\bar{B}\\rightarrow X_s\\gamma$ and $B^0_{d,s}\\rightarrow \\mu^+\\mu^-$, the\ntheoretical predictions on BR($t\\rightarrow qg$) can be enhanced to be\n$\\mathcal O(10^{-5}-10^{-6})$ and these two processes are very promising to be\nobserved at the HL-LHC and FCC-hh. The values of BR($t\\rightarrow\nq\\gamma,qZ,qh$) are predicted to be, at least, four orders of magnitude below\nthe present experimental bounds.", "positive": "Nonperturbative Pauli-Villars regularization of vacuum polarization in\n light-front QED: We continue the development of a nonperturbative light-front Hamiltonian\nmethod for the solution of quantum field theories by considering the one-photon\neigenstate of Lorentz-gauge QED. The photon state is computed nonperturbatively\nfor a Fock basis with a bare photon state and electron-positron pair states.\nThe calculation is regulated by the inclusion of Pauli-Villars (PV) fermions,\nwith one flavor to make the integrals finite and a second flavor to guarantee a\nzero mass for the physical photon eigenstate. We compute in detail the\nconstraints on the PV coupling strengths that this zero mass implies. As part\nof this analysis, we provide the complete Lorentz-gauge light-front QED\nHamiltonian with two PV fermion flavors and two PV photon flavors, which will\nbe useful for future work. The need for two PV photons was established\npreviously; the need for two PV fermions is established here." }, { "anchor": "Neutron Star Stability in Light of the Neutron Decay Anomaly: A recent proposal suggests that experimental discrepancies on the lifetime of\nneutrons can be resolved if neutrons decay to dark matter. At the same time it\nhas been demonstrated that such a decay mode would soften the nuclear equation\nof state resulting in neutron stars with a maximum mass much below currently\nobserved ones. In this paper we demonstrate that appropriate dark matter-baryon\ninteractions can accommodate neutron stars with mass above 2 solar masses. We\nalso show that dark matter self-interactions could also help neutrons stars\nreach 2 solar masses provided that dark matter is of asymmetric nature.", "positive": "Grooming at the Cusp: All-Orders Predictions for the Transition Region\n of Jet Groomers: Jet grooming has emerged as a necessary and vital tool for mitigating\ncontamination radiation in jets. The additional restrictions on emissions\nimposed by the groomer can result in non-smooth behavior of resulting\nfixed-order distributions of observables measured on groomed jets. As a\nconcrete example, we study the cusp in the hemisphere mass distribution of\n$e^+e^-\\to$ hadrons events groomed with soft drop. We identify the leading\nemissions that contribute in the region about the cusp and formulate an\nall-orders factorization theorem that describes how the cusp is resolved\nthrough arbitrary strongly-ordered soft and collinear emissions. The\nfactorization theorem exhibits numerous novel features such as contributions\nfrom collinear modes that can cross hemisphere boundaries as well as requiring\nexplicit subtraction of the limit in which resolved emissions become collinear\nto the hard core. We present resummation of the cusp region through\nnext-to-leading logarithmic accuracy and describe how it can be matched with\nestablished factorization theorems that describe other groomed phase space\nregions." }, { "anchor": "Extracting the fundamental parameters: If supersymmetry is discovered at the LHC, the extraction of the fundamental\nparameters will be a formidable task. In such a system where measurements\ndepend on different combinations of the parameters in a highly correlated\nsystem, the identification of the true parameter set in an efficient way\nnecessitates the development and use of sophisticated methods. A rigorous\ntreatment of experimental and theoretical errors is necessary to determine the\nprecision of the measurement of the fundamental parameters. The techniques\ndeveloped for this endeavor can also be applied to similar problems such as the\ndetermination of the Higgs boson couplings at the LHC.", "positive": "Constraints on the interpretation of the superluminal motion of\n neutrinos at OPERA: Various approaches aim to describe the recent analysis by the OPERA\nexperiment, which indicates that neutrinos travel faster than the speed of\nlight. We demonstrate that any such theoretical or experimental explanation\nmust not destroy the complicated (nonlinear) structure of the proton waveform\nrecovered in the neutrino signal. As one example, consider that only a fraction\nof the neutrinos travel faster than the speed of light, such as sterile\nneutrinos. We fit the OPERA data including this fraction as a free variable,\nassuming that the OPERA result is correct. In our analysis, the best-fit values\nare 50% of the neutrinos being superluminal and (v-c)/c = 4.5 10^{-5}, where\nthe neutrino velocity increases as the fraction of superluminal neutrinos\ndecreases. The minimal fraction of superluminal neutrinos is found to be 17% (3\nsigma), which is constrained by the non-linearity of the proton waveform. This\nminimal fraction challenges the hypothesis that only sterile neutrinos travel\nfaster than the speed of light. In addition, we demonstrate that an\nexperimental effect introducing a smearing between the proton waveform and\nneutrino signal, as expected for some systematical errors, is also limited by\nthe shape of the waveform. Finally, we illustrate that even stronger\nconstraints may be obtained from the recent analysis with a short-bunch beam,\nin spite of the low statistics." }, { "anchor": "Creating a hybrid of matrix elements and parton showers: The second-order QCD matrix elements give a very good agreement with\nexperimental data on the angular distributions of the four-jet events in e+e-\ncollisions at the Z0 resonance energy. Unfortunately the description of the\nsub-jet structure is quite poor. The alternative approach, parton showers,\ngives a good description of the sub-jet structure but is worse than matrix\nelements when it comes to the angular distributions. Here is presented a hybrid\nbetween the matrix elements and the parton showers that is intended to combine\nthe best of the two approaches.", "positive": "Developments in Supergravity Unified Models: A review is given of developments in supergravity unified models proposed in\n1982 and their implications for current and future experiment are discussed." }, { "anchor": "Aspects of the Unitarized Soft Multipomeron Approach in DIS and\n Diffraction: We study in detail the main features of the unitarized Regge model (CFKS),\nrecently proposed to describe the small-$Q^2$ domain. It takes into account a\ntwo-component description with two types of unitarized contributions: one is\nthe multiple pomeron exchange contribution, interacting with the large dipole\nconfigurations, and the other one consists of a unitarized dipole cross\nsection, describing the interaction with the small size dipoles. We analyze the\nratio between soft and hard pieces as a function of the virtuality, and also\ncompare the resulting dipole cross section to that from the saturation model.\nDiffraction dissociation is also considered, showing the scaling violations in\ndiffractive DIS and estimating the corresponding logarithmic slope.", "positive": "Global Analysis of Nuclear PDFs: We present a new global QCD analysis of nuclear parton distribution\nfunctions. In addition to the most commonly analyzed data sets for deep\ninelastic scattering of charged leptons off nuclei and Drell Yan di-lepton\nproduction, we include also measurements for neutrino-nuclei scattering as well\nas inclusive pion production in deuteron-gold collisions. The emerging picture\nis one of consistency, where universal nuclear modification factors for each\nparton flavor reproduce the main features of all data without any significant\ntension among the different sets." }, { "anchor": "The Two-Loop Static Potential: In quantum chromodynamics (QCD), the binding energy of an infinitely heavy\nquark--antiquark pair in a color singlet state can be calculated as a function\nof the distance. We investigate this static potential of QCD perturbatively and\ncalculate the full two-loop coefficient, correcting an earlier result. Beyond\nthis order, the perturbative expansion breaks down.", "positive": "A semi-supervised approach to dark matter searches in direct detection\n data with machine learning: The dark matter sector remains completely unknown. It is therefore crucial to\nkeep an open mind regarding its nature and possible interactions. Focusing on\nthe case of Weakly Interacting Massive Particles, in this work we make this\ngeneral philosophy more concrete by applying modern machine learning techniques\nto dark matter direct detection. We do this by encoding and decoding the\ngraphical representation of background events in the XENONnT experiment with a\nconvolutional variational autoencoder. We describe a methodology that utilizes\nthe `anomaly score' derived from the reconstruction loss of the convolutional\nvariational autoencoder as well as a pre-trained standard convolutional neural\nnetwork, in a semi-supervised fashion. Indeed, we observe that optimum results\nare obtained only when both unsupervised and supervised anomaly scores are\nconsidered together. A data set that has a higher proportion of anomaly score\nis deemed anomalous and deserves further investigation. Contrary to classical\nanalyses, in principle all information about the events is used, preventing\nunnecessary information loss. Lastly, we demonstrate the reach of\nlearning-focused anomaly detection in this context by comparing results with\nclassical inference, observing that, if tuned properly, these techniques have\nthe potential to outperform likelihood-based methods." }, { "anchor": "LEPTO 6.5 - A Monte Carlo Generator for Deep Inelastic Lepton-Nucleon\n Scattering: Physics and programming aspects are discussed for a Fortran 77 Monte Carlo\nprogram to simulate complete events in deep inelastic lepton-nucleon\nscattering. The parton level interaction is based on the standard model\nelectroweak cross sections, which are fully implemented in leading order for\nany lepton of arbitrary polarization, and different parametrizations of parton\ndensity functions can be used. First order QCD matrix elements for gluon\nradiation and boson-gluon fusion are implemented and higher order QCD radiation\nis treated using parton showers. Hadronization is performed using the Lund\nstring model, implemented in {\\sc Jetset}/{\\sc Pythia}. Rapidity gap events are\ngenerated through a model based on soft colour interactions.", "positive": "High energy amplitude in the dipole approach with Pomeron loops:\n asymptotic solution: In this paper an analytical solution for the high energy scattering amplitude\nis suggested. This solution has several unexpected features:(i) the asymptotic\namplitude is a function of dipole sizes and, therefore, this amplitude shows\nthe gray disc structure at high energy, instead of black disc behaviour which\nwas expected; (ii) the amplitude approaches the asymptotic limit in the same\nway as the solution to the Balitsky-Kovchegov equation does ($\\propto \\exp(- C\nY^2) $), but the coefficient $C$ in eight times smaller than for the\nBalitsky-Kovchegov equation; (iii) the process of merging of two dipoles into\none, only influences the high energy asymptotic behaviour by changing the\ninitial condition from $Z(Y; [u_i = 1]) = 1 $ to $Z(Y; [u_i = 1 -\n\\gamma_{0,i}]) =1$. The value of $\\gamma_0$ is determined by the process of\nmerging of two dipoles into one. With this new initial condition the\nBalitsky-JIMWLK approach describes the high energy asymptotic behaviour of the\nscattering amplitude without any modifications recently suggested." }, { "anchor": "Probing Lorentz violation effects via a laser beam interacting with a\n high-energy charged lepton beam: In this work, the conversion of linear polarization of a laser beam to\ncircular one through its forward scattering by a TeV order charged lepton beam\nin the presence of Lorentz violation correction is explored. We calculate the\nratio of circular polarization to linear one (Faraday Conversion phase\n$\\Delta\\phi_{\\rm{FC}}$) of the laser beam interacting with either electron or\nthe muon beam in the framework of the quantum Boltzmann equation.\n Regarding the experimentally available sensitivity to the Faraday conversion\n$\\Delta\\phi_{\\rm{FC}}\\simeq 10^{-3}-10^{-2}$, we show that the scattering of a\nlinearly polarized laser beam with energy $k_0\\sim 0.1$ eV and an electron/muon\nbeam with flux $\\bar{\\epsilon}_{e,\\mu}\\sim 10^{10}/10^{12}$ TeV cm$^{-2}$\ns$^{-1}$ places an upper bound on the combination of lepton sector Lorentz\nviolation coefficients $c_{\\mu\\nu}$ components\n$(c_{TT}+1.4~c_{(TZ)}+0.25(c_{XX}+c_{YY}+2~c_{ZZ}))$. The obtained bound on the\ncombination for the electron beam is at the $4.35\\times 10^{-15}$ level and for\nthe muon beam at the $3.9\\times 10^{-13}$ level. It should be mentioned that\nthe laser and charged lepton beams considered here to reach the experimentally\nmeasurable $\\Delta\\phi_{\\rm{FC}}$ are currently available or will be accessible\nin the near future. This study provides a valuable supplementary to other\ntheoretical and experimental frameworks for measuring and constraining Lorentz\nviolation coefficients.", "positive": "Flavor violating Higgs and $Z$ decays at FCC-ee: Recent advances in $b$, $c$, and $s$ quark tagging coupled with novel\nstatistical analysis techniques will allow future high energy and high\nstatistics electron-positron colliders, such as the FCC-ee, to place\nphenomenologically relevant bounds on flavor violating Higgs and $Z$ decays to\nquarks. We assess the FCC-ee reach for $Z/h\\to bs, cu$ decays as a function of\njet tagging performance. We also update the SM predictions for the\ncorresponding branching ratios, as well as the indirect constraints on the\nflavor violating Higgs and $Z$ couplings to quarks. Using type III two Higgs\ndoublet model as an example of beyond the standard model physics, we show that\nthe searches for $h\\to bs, cu$ decays at FCC-ee can probe new parameter space\nnot excluded by indirect searches. We also reinterpret the FCC-ee reach for\n$Z\\to bs , cu$ in terms of the constraints on models with vectorlike quarks." }, { "anchor": "Democratic Seesaw Mass Matrix Model and New Physics: A seesaw mass matrix model is reviewed as a unification model of quark and\nlepton mass matrices. The model can understand why top-quark mass m_t is so\nsingularly enhanced compared with other quark masses, especially, why m_t >>\nm_b in contrast to m_u = O(m_d), and why only top-quark mass is of the order of\nthe electroweak scale Lambda_W, i.e., m_t = O(Lambda_W). The model predicts the\nfourth up-quark t' with a mass m_{t'}= O(m_{W_R}), and an abnormal structure of\nthe right-handed up-quark mixing matrix U_R^u. Possible new physics is\ndiscussed.", "positive": "Status of baryonic B decays: An overview of exclusive two-body and three-body baryonic B decays is given.\nThe threshold enhancement effect in the dibaryon invariant mass and the angular\ndistributions in the dibaryon rest frame are stressed and explained. Weak\nradiative baryonic B decays mediated by the electromagnetic penguin process\n$b\\to s\\gamma$ are discussed. Apart from the first observation of the radiative\npenguin decay $B^-\\to\\Lambda\\bar p\\gamma$ with the baryonic final state, the\ndecay $B^-\\to \\Xi^0\\bar\\Sigma^-\\gamma$ at the level of $6\\times 10^{-7}$ may be\naccessible to B factories in the near future." }, { "anchor": "Exotic resonances due to $\u03b7$ exchange: The meson $X(3872)$ and several related states appear to be, at least in\npart, hadronic molecules in which a heavy flavored meson (such as $D^0$) is\nbound to another heavy meson (such as $\\bar D^{*0}$). Although not the only\neffect contributing to the binding, pion exchange seems to play a crucial role\nin generating the longest-range force between constituents. Mesons without $u$\nand $d$ light quarks (such as $D_s$) cannot exchange pions, but under suitable\ncircumstances can bind as a result of $\\eta$ exchange. Channels in which this\nmechanism is possible are identified, and suggestions are made for searches for\nthe corresponding molecular states, including a manifestly exotic baryonic\n$\\Lambda_c \\bar D_s^*$ resonance decaying into $J/\\psi~\\Lambda$.", "positive": "Dipole operators in Fierz identities: We study the contribution from dipole operators to one-loop Fierz identities\nand provide the resulting QCD and QED shifts to the tree-level relations for\nall four-fermion operators. The results simplify one-loop basis changes as well\nas matching computations and allow one to consistently eliminate operators from\nan operator basis which give rise to complications, e.g. traces involving\n$\\gamma_5$." }, { "anchor": "On two-loop corrections to the Higgs trilinear coupling in models with\n extended scalar sectors: We investigate the possible size of two-loop radiative corrections to the\nHiggs trilinear coupling $\\lambda_{hhh}$ in two types of models with extended\nHiggs sectors, namely in a Two-Higgs-Doublet Model (2HDM) and in the Inert\nDoublet Model (IDM). We calculate the leading contributions at two loops\narising from the additional (heavy) scalars and the top quark of these theories\nin the effective-potential approximation. We include all necessary conversion\nshifts in order to obtain expressions both in the $\\overline{\\text{MS}}$ and\non-shell renormalisation schemes, and in particular, we devise a consistent\n\"on-shell\" prescription for the soft-breaking mass of the 2HDM at the two-loop\nlevel. We illustrate our analytical results with numerical studies of simple\naligned scenarios and show that the two-loop corrections to $\\lambda_{hhh}$\nremain smaller than their one-loop counterparts, with a typical size being\n10-20% of the one-loop corrections, at least while perturbative unitarity\nconditions are fulfilled. As a consequence, the existence of a large deviation\nof the Higgs trilinear coupling from the prediction in the Standard Model,\nwhich has been discussed in the literature at one loop, is not altered\nsignificantly.", "positive": "Vector Portal Pseudo-Goldstone Dark Matter: We present a model of pseudo-Goldstone dark matter that interacts through a\nlight vector mediator based on a spontaneously broken $SU(2)$ dark sector. The\ndark matter mass is induced by the explicit breaking of the dark $SU(2)$\nsymmetry. A residual global $U(1)$ symmetry prevents dark matter decay. The\nbehavior of this model is studied under the assumption that the observed dark\nmatter relic abundance is due to thermal freeze-out. We consider\nself-interaction targets for small scale structure anomalies and the\npossibility of interacting with the Standard model through the vector mediator." }, { "anchor": "The origin of thermal component in the transverse momentum spectra in\n high energy hadronic processes: The transverse momentum spectra of hadrons produced in high energy collisions\ncan be decomposed into two components: the exponential (\"thermal\") and the\npower (\"hard\") ones. Recently, the H1 Collaboration has discovered that the\nrelative strength of these two components in Deep Inelastic Scattering depends\ndrastically upon the global structure of the event - namely, the exponential\ncomponent is absent in the diffractive events characterized by a rapidity gap.\nWe discuss the possible origin of this effect, and speculate that it is linked\nto confinement. Specifically, we argue that the thermal component is due to the\neffective event horizon introduced by the confining string, in analogy to the\nHawking-Unruh effect. In diffractive events, the $t$-channel exchange is\ncolor-singlet and there is no fragmenting string -- so the thermal component is\nabsent. The slope of the soft component of the hadron spectrum in this picture\nis determined by the saturation momentum that drives the deceleration in the\ncolor field, and thus the Hawking-Unruh temperature. We analyze the data on\nnon-diffractive $pp$ collisions and find that the slope of the thermal\ncomponent of the hadron spectrum is indeed proportional to the saturation\nmomentum.", "positive": "Dilepton Signals in the Inert Doublet Model: The Inert Doublet Model is one of the simplest and most versatile scenarios\nfor physics beyond the Standard Model. In this work, we examine the prospects\nfor detecting the additional fields of this model at the LHC in the dilepton\nchannel. We investigate a wide variety of theoretically- and\nphenomenologically-motivated benchmark scenarios, and show that within regions\nof model parameter space in which the dark-matter candidate is relatively light\n(between 40 and 80 GeV) and the mass splitting between the neutral scalars is\nalso roughly 40 - 80 GeV, a signal at the 3 sigma to 12 sigma significance\nlevel can be observed with 100 fb^-1 of integrated luminosity. In addition,\neven if the mass splitting between the neutral scalars is larger than M_Z, a\nsignal of more than 3 sigma can be observed as long as the mass of the dark\nmatter candidate is around 40 GeV." }, { "anchor": "The flavor-changing top-charm quark production in the littlest Higgs\n model with T parity at the ILC: With high luminosity and energy at the ILC and clean SM backgrounds, the\ntop-charm production at the ILC should have powerful potential to probe new\nphysics. The littlest Higgs model with discrete symmetry named \"T-parity\"(LHT)\nis one of the most promising new physics models. In this paper, we study the FC\nprocesses $e^+e^-(\\gamma\\gamma)\\to t\\bar{c}$ at the ILC in the LHT model. Our\nstudy shows that the LHT model can make a significant contribution to these\nprocesses. When the masses of mirror quarks become large, these two processes\nare accessible at the ILC. So the top-charm production at the ILC provides a\nunique way to study the properties of the FC couplings in the LHT model and\nfurthermore test the model.", "positive": "Neutrino Masses at LHC: Minimal Lepton Flavour Violation in Type-III\n See-saw: We study the signatures of minimal lepton flavour violation in a simple\nType-III see - saw model in which the flavour scale is given by the new fermion\ntriplet mass and it can be naturally light enough to be produced at the LHC. In\nthis model the flavour structure of the lepton number conserving couplings of\nthe triplet fermions to the Standard Model leptons can be reconstructed from\nthe neutrino mass matrix and the smallness of the neutrino mass is associated\nwith a tiny violation of total lepton number. Characteristic signatures of this\nmodel include suppressed lepton number violation decays of the triplet\nfermions, absence of displaced vertices in their decays and predictable lepton\nflavour composition of the states produced in their decays. We study the\nobservability of these signals in the processes $pp\\rightarrow 3\\ell + 2j\n+\\Sla{E_T}$ and $pp\\rightarrow 2\\ell + 4j$ with $\\ell =e$ or $\\mu$ taking into\naccount the present low energy data on neutrino physics and the corresponding\nStandard Model backgrounds. Our results indicate that the new fermionic states\ncan be observed for masses up to 500 GeV depending on the CP violating Majorana\nphase for an integrated luminosity of 30 fb$^{-1}$. Moreover, the flavour of\nthe final state leptons in the above processes can shed light on the neutrino\nmass ordering." }, { "anchor": "Testing flavor-changing neutral currents in the rare decays t->cViVj: We discuss the Flavor-Changing Neutral Current (FCNC) decays of the top quark\nt -> c Vi Vj (Vi=gamma, Z, g) in the framework of the Standard Model (SM) and\nin a two-higgs doublet model (2HDM) with tree-level FCNC couplings. While in\nthe SM the expected branching ratios are extremelly small, in the 2HDM they may\nbe sizable, of order 10^(-5) - 10^(-5), and thus accesible at the CERN LHC. We\nconclude with the interesting observation that the FCNC decay modes may not be\nequally suppressed as their corresponding decays t ->c Vi in this 2HDM.", "positive": "Mass Spectra of Heavy-Light Mesons in Heavy Hadron Chiral Perturbation\n Theory: We study the masses of the low-lying charm and bottom mesons within the\nframework of heavy- hadron chiral perturbation theory (HHChPT). We work to\nthird order in the chiral expansion, where meson loops contribute. In contrast\nto previous approaches, we use physical meson masses in evaluating these loops.\nThis ensures that their imaginary parts are consistent with the observed widths\nof the D-mesons. The lowest odd- and even-parity, strange and nonstrange charm\nmesons provide enough constraints to determine only certain linear combinations\nof the low-energy constants (LECs) in the effective Lagrangian. We comment on\nhow lattice QCD could provide further information to disentangle these\nconstants. Then we use the results from the charm sector to predict the\nspectrum of odd- and even-parity of the bottom mesons. The predicted masses\nfrom our theory are in good agreement with experimentally measured masses for\nthe case of the odd-parity sector. For the even-parity sector, the B-meson\nstates have not yet been observed; thus, our results provide useful information\nfor experimentalists investigating such states. The near degeneracy of\nnonstrange and strange scalar B mesons is confirmed in our predictions using\nHHChPT. We show why previous approaches of using HHChPT in studying the mass\ndegeneracy in the scalar states of charm and bottom meson sectors gave\nunsatisfactory results." }, { "anchor": "An $a_0$ resonance in strongly coupled $\u03c0\u03b7$, $K\\overline{K}$\n scattering from lattice QCD: We present the first calculation of coupled-channel meson-meson scattering in\nthe isospin $=1$, $G$-parity negative sector, with channels $\\pi \\eta$,\n$K\\overline{K}$ and $\\pi \\eta'$, in a first-principles approach to QCD. From\nthe discrete spectrum of eigenstates in three volumes extracted from lattice\nQCD correlation functions we determine the energy dependence of the $S$-matrix,\nand find that the $S$-wave features a prominent cusp-like structure in $\\pi\n\\eta \\to \\pi \\eta$ close to $K\\overline{K}$ threshold coupled with a rapid turn\non of amplitudes leading to the $K\\overline{K}$ final-state. This behavior is\ntraced to an $a_0(980)$-like resonance, strongly coupled to both $\\pi \\eta$ and\n$K\\overline{K}$, which is identified with a pole in the complex energy plane,\nappearing on only a single unphysical Riemann sheet. Consideration of $D$-wave\nscattering suggests a narrow tensor resonance at higher energy.", "positive": "Pure Annihilation Type $B \\to K_0^{*\\pm}(1430)K^{(*)\\mp}$ Decays in the\n Family Non-universal $Z^\\prime$ Model: By assuming that the scalar meson $K_0^*(1430)$ belongs to the first excited\nstates or the lowest lying ground states, we study the pure annihilation-type\ndecays $B \\to K_0^{*\\pm}(1430)K^{(*)\\mp}$ in the QCD factorization approach.\nWithin the standard model, the branching fractions are at the order of\n$10^{-8}-10^{-7}$, which is possible to be measured in the ongoing LHCb\nexperiment or forthcoming Belle-II experiment. We also study these decays in\nthe family non-universal $Z^\\prime$ model. The results show that if\n$m_{Z^\\prime}\\approx 600\\mathrm{GeV}$ ($\\zeta=0.02$), both the branching\nfractions and $CP$ asymmetries of $\\overline B^0\\to K_0^{*+}(1430)K^-$ could be\nchanged remarkably, which provides us a place for probing the effect of new\nphysics. These results could be used to constrain the parameters of $Z^\\prime$\nmodel." }, { "anchor": "Model independent method for determination of the DIS structure of free\n neutron: We present a model independent procedure for extracting deep-inelastic\nstructure function of \"free'' neutron from the electron - deuteron scattering\nwith protons produced in the target fragmentation region of the reaction. This\nprocedure is based on the extrapolation of t, which describes the invariant\nmomentum transfered to the proton, to the unphysical region corresponding to\nthe mass of the struck neutron. We demonstrate that the impulse approximation\ndiagram of the reaction has a pole at this limit with a residue being\nproportional to the \"free\" neutron structure function. The method is analogous\nto that of Chew and Low for extraction of the ``free'' pion-pion and\nneutron-neutron cross sections from p(pion,p)X and d(n,n)pn reactions\nrespectively. We demonstrate that in the extrapolation the final state\ninteraction amplitudes are smooth functions of $t$ and have negligible\ncontribution in the extracted ``free'' nucleon structure function. We also\nestimate the range of the recoil nucleon momenta which could be used for\nsuccessful extrapolation procedure.", "positive": "Some Remarks on the Pomeron and the Odderon in Theory and Experiment: On March 19-21, 1998, a workshop devoted to questions of the pomeron and the\nodderon in high energy scattering was held in Heidelberg. This note gives a\npersonal account of some of the issues discussed at this workshop. Of course,\nmisconceptions and misunderstandings are to be blamed on us, not on the other\nparticipants of the workshop. A puzzle of odderon physics is identified and a\nconvenient reaction for its experimental study is discussed." }, { "anchor": "Warm Little Inflaton becomes Cold Dark Matter: We present a model where the inflaton can naturally account for all the dark\nmatter in the Universe within the warm inflation paradigm. In particular, we\nshow that the symmetries of the Warm Little Inflaton scenario (i) avoid large\nthermal and radiative corrections to the scalar potential, (ii) allow for\nsufficiently strong dissipative effects to sustain a radiation bath during\ninflation that becomes dominant at the end of the slow-roll regime, and (iii)\nenable a stable inflaton remnant in the post-inflationary epochs. The latter\nbehaves as dark radiation until parametrically before matter-radiation\nequality, leading to a non-negligible contribution to the effective number of\nrelativistic degrees of freedom during nucleosynthesis, becoming the dominant\ncold dark matter component in the Universe for inflaton masses in the\n$10^{-4}-10^{-1}$ eV range. Cold dark matter isocurvature perturbations,\nanti-correlated with the main adiabatic component, provide a smoking gun for\nthis scenario that can be tested in the near future.", "positive": "Leptogenesis at the Electroweak Scale: In this note we propose a model of leptogenesis in which the scale for the\nmass of the necessary heavy neutral lepton is similar to the scale of\nelectroweak symmetry breaking." }, { "anchor": "Probing of $Wtb$ Anomalous Couplings via the $tW$ Channel of Single Top\n Production: The potential of LHC for investigation of the $W$-$t$-$b$ vertex through the\n$tW$ channel of single top quark production is studied. Unlike the other two\nsingle top quark production processes ($t-$channel and $s-$channel), the $tW$\nchannel provides the possibility to study the $Wtb$ vertex without receiving\ncontamination from FCNC. This study has been done at parton level but is\ninvolved the separation of signal from backgrounds when both $W$-bosons decay\nto leptons. In this study $\\mathcal{CP}$ is assumed to be conserved. The 68%\nC.L. bounds on the non-Standard Model couplings are estimated.", "positive": "Electromagnetic corrections to non-leptonic two-body B and D decays: We present analytic expressions to evaluate at O(alpha) the effects of\nsoft-photon emission, and the related virtual corrections, in non-leptonic\ndecays of the type B,D -> P1 P2, where P1 and P2 are scalar or pseudoscalar\nparticles. The phenomenological implications of these results are briefly\ndiscussed. For B decays into charged pions the effects of soft-photon emission\nare quite large: the corrections to the rates can easily exceed the 5% level if\ntight cuts on the photon energy are applied." }, { "anchor": "Snowmass 2001: Jet Energy Flow Project: Conventional cone jet algorithms arose from heuristic considerations of LO\nhard scattering coupled to independent showering. These algorithms implicitly\nassume that the final states of individual events can be mapped onto a unique\nset of jets that are in turn associated with a unique set of underlying hard\nscattering partons. Thus each final state hadron is assigned to a unique\nunderlying parton. The Jet Energy Flow (JEF) analysis described here does not\nmake such assumptions. The final states of individual events are instead\ndescribed in terms of flow distributions of hadronic energy. Quantities of\nphysical interest are constructed from the energy flow distribution summed over\nall events. The resulting analysis is less sensitive to higher order\nperturbative corrections and the impact of showering and hadronization than the\nstandard cone algorithms.", "positive": "Anisotropic $e^+ e^-$ pressure due to the QED effect in strong magnetic\n fields and the application to the entropy production in neutrino-driven wind: We study the equation of state of electron in strong magnetic fields which\nare greater than the critical value $B_c \\simeq 4.4 \\times 10^{13}$ Gauss. We\nfind that such a strong magnetic field induces the anisotropic pressure of\nelectron. We apply the result to the neutrino-driven wind in core-collapse\nsupernovae and find that it can produce large entropy per baryon, $S \\sim 400\nk_B$. This mechanism might successfully account for the production of the heavy\nnuclei with mass numbers A = 80 -- 250 through the r-process nucleosynthesis." }, { "anchor": "Multigluon Helicity Amplitudes Involving a Quark Loop: We apply the solution to the recursion relation for the double-off-shell\nquark current to the problem of computing one loop amplitudes with an arbitrary\nnumber of gluons. We are able to compute amplitudes for photon-gluon\nscattering, electron-positron annihilation to gluons, and gluon-gluon\nscattering via a quark loop in the case of like-helicity gluons. In addition,\nwe present the result for the one-loop gluon-gluon scattering amplitude when\none of the gluons has opposite helicity from the others.", "positive": "A New Decoupling Theorem in Top-Quark Physics: Angular distribution of a secondary particle in top-quark production/decay is\nstudied in a simple and general manner. It is shown that the distribution does\nnot depend on any possible anomalous top-quark-decay interactions whatever the\nproduction mechanism is when certain well-justified conditions are satisfied.\nSome analyses using the final- state lepton are presented as an example of its\napplication." }, { "anchor": "CPT-Violating, Massive Photons and Cherenkov Radiation: CPT-Violating photons are well-known to have problems with energy positivity\nin certain cases and therefore have not been convincingly quantized to date. We\nfind that by adding a small mass term, consistent with experimental bounds, the\ntheory can be regulated and allows for a consistent covariant quantization\nprocedure. This new framework is applied to a consistent quantum calculation of\nvacuum Cherenkov radiation rates. These rates turn out to be largely\nindependent of the mass of the photon regulator used. In the physical regime,\naccessible by ultra high energy cosmic rays, the behavior of the rate is\nproportional to the square of the CPT-violating parameter and is not\nrealistically observable.", "positive": "Chiral symmetry breaking in hot matter: This series of three lectures covers (a) a basic introduction to symmetry\nbreaking in general and chiral symmetry breaking in QCD, (b) an overview of the\npresent status of lattice data and the knowlegde that we have at finite\ntemperature from chiral perturbation theory. (c) Results obtained from the\nNambu--Jona-Lasinio model describing static mesonic properties are discussed as\nwell as the bulk thermodynamic quantities. Divergences that are observed in the\nelastic quark-antiquark scattering cross-section, reminiscent of the phenomenon\nof critical opalescence in light scattering, is also discussed. (d) Finally, we\ndeal with the realm of systems out of equilibrium, and examine the effects of a\nmedium dependent condensate in a system of interacting quarks." }, { "anchor": "Strangeness production in heavy ion collisions: Strangeness production in heavy ion collisions is discussed in a broad energy\nrange from SIS to RHIC. %We emphasize that in the In the whole energy range\nparticle yields are showing high level of chemical equilibration which can be\ndescribed by the unified freezeout conditions of fixed energy/particle $\\simeq\n1$GeV. The statistical model within the canonical formulation of strangeness\nconservation provides a framework to describe the observed enhancement of\n(multi)strange particles from p+A to A+A collisions measured at the SPS energy\nand predicts that this enhancement should be larger for decreasing collision\nenergy. However, only at the SPS and RHIC chemical freezeout temperature is\nconsistent within error with the critical value required for deconfinement and\nsimultaneously strangeness is uncorrelated and distributed in the whole volume\nof the fireball.", "positive": "Application of a light-front coupled cluster method: As a test of the new light-front coupled-cluster method in a gauge theory, we\napply it to the nonperturbative construction of the dressed-electron state in\nQED, for an arbitrary covariant gauge, and compute the electron's anomalous\nmagnetic moment. The construction illustrates the spectator and Fock-sector\nindependence of vertex and self-energy contributions and indicates resolution\nof the difficulties with uncanceled divergences that plague methods based on\nFock-space truncation." }, { "anchor": "Methane ionization chamber to search for spin-dependent dark matter\n interactions: A liquid-methane ionization chamber is proposed as a setup to search for\nspin-dependent interactions of dark-matter particles with hydrogen", "positive": "Baryon-to-meson transition distribution amplitudes: formalism and models: In specific kinematics, hard exclusive amplitudes may be factorized into a\nshort distance dominated part computable in a perturbative way on the one hand,\nand universal, confinement related hadronic matrix elements on the other hand.\nThe extension of this description to processes such as backward meson\nelectroproduction and forward meson production in antiproton-nucleon scattering\nleads to define new hadronic matrix elements of three quark operators on the\nlight cone, the nucleon-to-meson transition distribution amplitudes, which shed\na new light on the nucleon structure." }, { "anchor": "Neural Networks for Full Phase-space Reweighting and Parameter Tuning: Precise scientific analysis in collider-based particle physics is possible\nbecause of complex simulations that connect fundamental theories to observable\nquantities. The significant computational cost of these programs limits the\nscope, precision, and accuracy of Standard Model measurements and searches for\nnew phenomena. We therefore introduce Deep neural networks using Classification\nfor Tuning and Reweighting (DCTR), a neural network-based approach to reweight\nand fit simulations using all kinematic and flavor information -- the full\nphase space. DCTR can perform tasks that are currently not possible with\nexisting methods, such as estimating non-perturbative fragmentation\nuncertainties. The core idea behind the new approach is to exploit powerful\nhigh-dimensional classifiers to reweight phase space as well as to identify the\nbest parameters for describing data. Numerical examples from\n$e^+e^-\\rightarrow\\text{jets}$ demonstrate the fidelity of these methods for\nsimulation parameters that have a big and broad impact on phase space as well\nas those that have a minimal and/or localized impact. The high fidelity of the\nfull phase-space reweighting enables a new paradigm for simulations, parameter\ntuning, and model systematic uncertainties across particle physics and possibly\nbeyond.", "positive": "Non local lagrangians(I): the pion: We define a family of non local and chirally symmetric low energy lagrangians\nmotivated by theoretical studies on Quantum Chromodynamics. These models lead\nto quark propagators with non trivial momentum dependencies. We define the\nformalism for two body bound states and apply it to the pion. We study the\ncoupling of the photon and W bosons with special attention to the\nimplementation of local gauge invariance. We calculate the pion decay constant\nrecovering the Goldberger-Treiman and the Gell-Mann-Oakes-Renner relations. We\nrecover a form of the axial current consistent with PCAC. Finally we study the\npion form factor and we construct the operators involved in its parton\ndistribution." }, { "anchor": "Light Thermal Self-Interacting Dark Matter in the Shadow of Non-Standard\n Cosmology: In this paper, we construct a viable model for a GeV scale self-interacting\ndark matter (DM), where the DM was thermally produced in the early universe.\nHere, a new vector-like fermion with a dark charge under the $U(1)_{D}$ gauge\nsymmetry serves as a secluded WIMP DM and it can dominantly annihilate into the\nlight dark gauge boson and singlet scalar through the dark gauge interaction.\nAlso, the self-interaction of DM is induced by the light dark gauge boson via\nthe same gauge interaction. In addition to these particles, we further\nintroduce two Weyl fermions and a doublet scalar, by which the dark gauge boson\nproduced from s-wave DM annihilations can mostly decay into active neutrinos\nafter the dark symmetry breaking such that the CMB bound on the DM with low\nmasses can be eluded. In order to have a common parameter region to explain the\nobserved relic abundance and self-interaction of DM, we also study this model\nin a non-standard cosmological evolution, where the cosmic expansion driven by\na new field species is faster than the standard radiation-dominated universe\nduring the frozen time of DM. Reversely, one can also use the self-interacting\nnature of light thermal DM to examine the non-standard cosmological history of\nthe universe.", "positive": "Natural Cold Baryogenesis from Strongly Interacting Electroweak Symmetry\n Breaking: The mechanism of \"cold electroweak baryogenesis\" has been so far unpopular\nbecause its proposal has relied on the ad-hoc assumption of a period of hybrid\ninflation at the electroweak scale with the Higgs acting as the waterfall\nfield. We argue here that cold baryogenesis can be naturally realized without\nthe need to introduce any slow-roll potential. Our point is that composite\nHiggs models where electroweak symmetry breaking arises via a strongly\nfirst-order phase transition provide a well-motivated framework for cold\nbaryogenesis. In this case, reheating proceeds by bubble collisions and we\nargue that this can induce changes in Chern-Simons number, which in the\npresence of new sources of CP violation commonly lead to baryogenesis. We\nillustrate this mechanism using as a source of CP violation an effective\ndimension-six operator which is free from EDM constraints, another advantage of\ncold baryogenesis compared to the standard theory of electroweak baryogenesis.\nOur results are general as they do not rely on any particular UV completion but\nonly on a stage of supercooling ended by a first-order phase transition in the\nevolution of the universe, which can be natural if there is nearly conformal\ndynamics at the TeV scale. Besides, baryon-number violation originates from the\nStandard Model only." }, { "anchor": "Transport coefficients and resonances for a meson gas in Chiral\n Perturbation Theory: We present recent results on a systematic method to calculate transport\ncoefficients for a meson gas (in particular, we analyze a pion gas) at low\ntemperatures in the context of Chiral Perturbation Theory (ChPT). Our method is\nbased on the study of Feynman diagrams taking into account collisions in the\nplasma by means of the non-zero particle width. This implies a modification of\nthe standard ChPT power counting scheme. We discuss the importance of\nunitarity, which allows for an accurate high energy description of scattering\namplitudes, generating dynamically the $\\rho (770)$ and $f_0(600)$ mesons. Our\nresults are compatible with analyses of kinetic theory, both in the\nnon-relativistic very low-$T$ regime and near the transition. We show the\nbehavior with temperature of the electrical and thermal conductivities as well\nas of the shear and bulk viscosities. We obtain that bulk viscosity is\nnegligible against shear viscosity, except near the chiral phase transition\nwhere the conformal anomaly might induce larger bulk effects. Different\nasymptotic limits for transport coefficients, large-$N_c$ scaling and some\napplications to heavy-ion collisions are studied.", "positive": "Lattice QCD and heavy quarks: Some interesting heavy-flavor questions are mentioned that may yield to the\nmethods of lattice QCD. Special emphasis is placed on topics which arise in the\ndiscussion of CP violation in $B$ decays. Other subjects include quarkonium and\nlight-quark systems and some potential applications outside QCD." }, { "anchor": "Cancellation of Glauber gluon exchange in the double Drell-Yan process: An essential part of any factorisation proof is the demonstration that the\nexchange of Glauber gluons cancels for the considered observable. We show this\ncancellation at all orders for double Drell-Yan production (the double parton\nscattering process in which a pair of electroweak gauge bosons is produced)\nboth for the integrated cross section and for the cross section differential in\nthe transverse boson momenta. In the process of constructing this proof, we\nalso revisit and clarify some issues regarding the Glauber cancellation\nargument and its relation to the rest of the factorisation proof for the single\nDrell-Yan process.", "positive": "How Precisely Could We Identify WIMPs Model-Independently with Direct\n Dark Matter Detection Experiments: In this talk we present data analysis methods for reconstructing the mass and\ncouplings of Weakly Interacting Massive Particles (WIMPs) by using directly\nfuture experimental data (i.e., measured recoil energies) from direct Dark\nMatter detection. These methods are independent of the model of Galactic halo\nas well as of WIMPs. The basic ideas of these methods and the feasibility and\nuncertainties of applying them to direct detection experiments with the next\ngeneration detectors will be discussed." }, { "anchor": "Neutrino propagation in a medium with a magnetic field: We study the properties of neutrinos propagating in an isotropic magnetized\nmedium in the two physical approximations of degenerate Fermi gas and classical\nplasma. The dispersion relation shows that, for peculiar configurations of the\nmagnetic field, neutrinos can propagate freely as in vacuum, also for very\nlarge density; this result can be very important in the study of supernova\nevolution. For mixed neutrinos, the presence of a magnetic field can alter\nsignificatively MSW oscillations, and for particular configurations of the\nfield the resonance condition no longer occurs. Furthermore, on the contrary to\nthat happens in non-magnetized media, spatial dispersion arises and neutrino\ntrajectory can be in principle deviated; however a simple estimate shows that\nthis deviation is not detectable.", "positive": "Challenging the Stability of Light Millicharged Dark Matter: We investigate the cosmological stability of light bosonic dark matter\ncarrying a tiny electric charge. In the wave-like regime of high occupation\nnumbers, annihilation into gauge bosons can be drastically enhanced by\nparametric resonance. The millicharged particle can either be minimally coupled\nto photons or its electromagnetic interaction can be mediated via kinetic\nmixing with a massless hidden photon. In the case of a direct coupling current\nobservational constraints on the millicharge are stronger than those arising\nfrom parametric resonance. For the (theoretically preferred) case of kinetic\nmixing large regions of parameter space are affected by the parametric\nresonance leading at least to a fragmentation of the dark matter field if not\nits outright destruction." }, { "anchor": "CERN-INO magical Beta-beam experiment: A high precision probe for\n neutrino parameters: This talk is an attempt to underscore in detail the physics reach of an\nexperimental set-up where neutrinos produced in a beta-beam facility at CERN\nwould be observed in the proposed large magnetized iron calorimeter detector\n(ICAL) at the India-based Neutrino Observatory (INO). The \"magical\" CERN-INO\nbeta-beam set-up offers an excellent avenue to use the \"Golden\" channel ($\\nu_e\n\\to \\nu_{\\mu}$) oscillation probability for a simultaneous determination of the\nneutrino mass ordering and $\\theta_{13}$ avoiding the impact of the CP phase\n$\\delta_{CP}$ on these measurements. With Lorentz boost $\\gamma=650$ and\nirrespective of the true value of $\\delta_{CP}$, the neutrino mass hierarchy\ncould be determined at $3\\sigma$ C.L. if $\\sin^22\\theta_{13}{\\rm {(true)}} >\n5.6 \\times 10^{-4}$ and we can expect an unambiguous signal for $\\theta_{13}$\nat $3\\sigma$ C.L. if $\\sin^22\\theta_{13}{\\rm {(true)}} > 5.1 \\times 10^{-4}$\nindependent of the true neutrino mass hierarchy.", "positive": "Polynomiality of off-forward distribution functions in the chiral quark\n soliton model: Mellin moments of off-forward distribution functions are, at t = 0, even\npolynomials of the skewedness parameter xi. It is proven that the unpolarized\noff-forward distribution functions in the chiral quark soliton model satisfy\nthis so called polynomiality property. The proof is an important contribution\nto the demonstration that the description of off-forward distribution functions\nin the model is consistent." }, { "anchor": "Opening the 1$\\,$Hz axion window: An axion-like particle (ALP) with mass $m_\\phi \\sim 10^{-15}$eV oscillates\nwith frequency $\\sim$1 Hz. This mass scale lies in an open window of\nastrophysical constraints, and appears naturally as a consequence of grand\nunification (GUT) in string/M-theory. However, with a GUT-scale decay constant\nsuch an ALP overcloses the Universe, and cannot solve the strong CP problem. In\nthis paper, we present a two axion model in which the 1 Hz ALP constitutes the\nentirety of the dark matter (DM) while the QCD axion solves the strong CP\nproblem but contributes negligibly to the DM relic density. The mechanism to\nachieve the correct relic densities relies on low-scale inflation ($m_\\phi\n\\lesssim H_{\\rm inf}\\lesssim 1$ MeV), and we present explicit realisations of\nsuch a model. The scale in the axion potential leading to the 1 Hz axion\ngenerates a value for the strong CP phase which oscillates around\n$\\bar{\\theta}_{\\rm QCD}\\sim 10^{-12}$, within reach of the proton storage ring\nelectric dipole moment experiment. The 1 Hz axion is also in reach of near\nfuture laboratory and astrophysical searches.", "positive": "Further Development of the Tetron Model: After a prologue which clarifies some issues left open in my last paper, the\nmain features of the tetron model of elementary particles are discussed in the\nlight of recent developments, in particular the formation of strong and\nelectroweak vector bosons and a microscopic understanding of how the observed\ntetrahedral symmetry of the fermion spectrum may arise." }, { "anchor": "CP Violation in Heavy Neutrino Mediated $e^- e^- \\to W^- W^-$: We consider the reaction $e^- e^- \\rightarrow W^- W^-$ mediated by possible\nheavy neutrino exchange at future LINAC energies of $\\sqrt{s}>> 2 m_W$. This\nreaction is sensitive to CP phases of the neutrino mixing matrices, even at the\nlevel of Born amplitudes. Certain integrated cross-sections are shown to have\nthe power to resolve the CP phases when the experimental configurations are\nvaried. Asymmetries sensitive to CP violation (involving initial QED phases)\nfor $e^- e^-$ and $e^+ e^+$ reactions are constructed and their consequences\nconsidered.", "positive": "Universal scaling of gluon and ghost propagators in the infrared: A universal behavior is predicted for ghost and gluon propagators in the\ninfrared. The universal behavior is shown to be a signature of a one-loop\napproximation and emerges naturally by the massive expansion that predicts\nuniversal analytical functions for the inverse dressing functions that do not\ndepend on any parameter or color number. By a scaling of units and by adding an\nintegration constant, all lattice data, for different color numbers (and even\nquark content for the ghosts), collapse on the same universal curves predicted\nby the massive expansion." }, { "anchor": "Resonance Production in Heavy Ion Collisions - what can we learn from\n RHIC?: In these proceedings we concentrate on the refeeding and rescattering\nprobability of hadronic resonances. We discuss the probability to form\nresonances in binary baryon-meson or meson-meson collisions as a function of\ntime for various resonances using a transport model approach (UrQMD). We give\nan estimate of the re-feeding probability using a simplified thermal approach\nand discuss the relevance for the resonance/non-resonance ratio measured by\nSTAR.", "positive": "Modeling of Energy Distributions in Pseudo-Rest Frame Analyses of\n Two-Body Decays with Missing Particles: In this study, we introduce a parametric function designed to describe the\nenergy distribution of the observed particle within the framework of two-body\ndecays involving one undetected particle, analyzed using the pseudo-rest frame\napproximation. While we illustrate its effectiveness through the specific case\nstudy of the Lepton Flavor Violating decay $\\tau \\rightarrow l+\\alpha$, this\nparametric function is broadly applicable to a wide range of pseudo-rest frame\nmethod-related searches involving undetected particles. Remarkably, it requires\nonly a single simulation to account for the smearing effects resulting from the\npseudo-rest frame approximation. The uniqueness of this function lies in its\ndependency on the mass of the undetected particle, enabling continuous\nexploration of the mass parameter space. We validate the performance of our\nparametric function using simulated datasets and find that it exhibits\ncomparable performance to traditional simulation-based methods. Notably, our\napproach offers the distinct advantage of accommodating any mass value for the\nundetected particle without the need for multiple simulations." }, { "anchor": "The muon $g-2$ and $W$-mass anomalies explained and the electroweak\n vacuum stabilised by extending the minimal Type-II seesaw: The recent precise measurement of the $W$-mass by the CDF II collaboration is\nindicative of new physics beyond the Standard Model. On the other hand, a\nresolution of the longstanding muon $g-2$ anomaly also calls for additional\ndynamics. In this work, we accommodate the two aforementioned anomalies in an\nextension of the minimal Type-II seesaw model. That is, the minimal Type-II\nmodel is augmented with an additional doubly charged scalar and vector leptons.\nWhile a chirality-flip of the vector leptons can predict the observed value of\nmuon $g-2$, the value of the recently reported $W$-mass can also be\nsimultaneously achieved through the oblique parameters of the model. In\naddition, we further show that the parameter region allowing for the\nsimultaneous resolution of the two anomalies complies with the neutrino mass\ndata, lepton flavour violation and electroweak vacuum stability up to the\nPlanck scale.", "positive": "Hard gluon emission from colored scalar pairs\\break in e^+ e^-\n annihilation: We study QCD correction to the pair production of colored scalar particles in\nelectron-positron annihilation with an emphasis on gluon emission in the final\nstate. We discuss the usefulness of working in a ``quasi-two-body'' frame and\npresent the helicity amplitudes for the process. We compare the final state\nconfiguration with fermion pair production and find that the three-jet fraction\nfor the scalars shows quantitative difference from that for fermions." }, { "anchor": "Flavor Physics in the LHC era: the role of the lattice: We discuss the present status of global fits to the CKM unitary triangle\nusing the latest experimental and theoretical constraints. For the required\nnonperturbative weak matrix elements, we use three-flavor lattice QCD averages\nfrom www.latticeaverages.org; these have been updated from Ref. [1] to reflect\nall available lattice calculations as of the \"End of 2011\". Because of the\ngreater than 3 sigma disagreement between the extraction of |Vub| from\ninclusive and exclusive semileptonic b -> u l nu (l = e,mu) decays, particular\nemphasis is given to a clean fit in which we remove the information from these\ndecays. Given current theoretical and experimental inputs, we observe an\napproximately 3 sigma tension in the CKM unitarity triangle that may indicate\nthe presence of new physics in the quark-flavor sector. Using a\nmodel-independent parameterization of new-physics effects, we test the\ncompatibility of the data with scenarios in which the new physics is in kaon\nmixing, in B-mixing, or in B -> tau nu decay. We find that scenarios with new\nphysics in B -> tau nu decay or in B-mixing are approximately equally\npreferred. Finally, we interpret these results in terms contributions to Delta\nS = 2 and Delta B = 2 four-fermion operators. We find that the preferred scale\nof new physics (with Standard-Model like couplings) is in the few hundred GeV\nrange.", "positive": "Event Generators for Bhabha Scattering: The results obtained by the \"Event Generators for Bhabha Scattering\" working\ngroup during the CERN Workshop \"Physics at LEP2\" (1994/1995) are presented." }, { "anchor": "Proton stability in 5D GUTs with orbifold compactification: We construct SU(5) SUSY GUT in 5D compactified on S^1/Z_2 orbifold where the\nmatter fields are living in the five dimensional bulk. SU(5) symmetry is broken\ndown to the Standard Model gauge group by the orbifold projection which\nautomatically ensures stability of proton in all orders of perturbation theory.\nThe model predicts extra mirror quark-lepton families which along with the GUT\nparticles and the excitations of extra dimensions could be observable at high\nenergy colliders providing the unification scale is in the TeV range.", "positive": "Formation of extended topological defects during symmetry breaking phase\n transitions in O(2) and O(3) models: The density of extended topological defects created during symmetry-breaking\nphase transitions depends on the ratio between the correlation length in the\nsymmetric phase near $T_c$ and the winding length of the defects as determined\nby the momentaneous effective action after a typical relaxation time.\nConservation of winding number in numerical simulations requires a suitable\nembedding of the field variables and the appropriate geometrical implementation\nof the winding density on the discrete lattice. We define a modified Kibble\nlimit for the square lattice and obtain defect densities as functions of\nwinding lengths in O(2) and O(3) models. The latter allows to observe formation\nof disoriented aligned domains within the easy plane. Their extent is severely\nlimited by the momentaneous defect density during the course of the quench." }, { "anchor": "Evaluating the Gapless Color-Flavor Locked Phase: In neutral cold quark matter that is sufficiently dense that the strange\nquark mass M_s is unimportant, all nine quarks (three colors; three flavors)\npair in a color-flavor locked (CFL) pattern, and all fermionic quasiparticles\nhave a gap. We recently argued that the next phase down in density (as a\nfunction of decreasing quark chemical potential mu or increasing strange quark\nmass M_s) is the new ``gapless CFL'' (``gCFL'') phase in which only seven\nquasiparticles have a gap, while there are gapless quasiparticles described by\ntwo dispersion relations at three momenta. There is a continuous quantum phase\ntransition from CFL to gCFL quark matter at M_s^2/mu approximately equal to\n2*Delta, with Delta the gap parameter. Gapless CFL, like CFL, leaves unbroken a\nlinear combination \"Q-tilde\" of electric and color charges, but it is a\nQ-tilde-conductor with gapless Q-tilde-charged quasiparticles and a nonzero\nelectron density. In this paper, we evaluate the gapless CFL phase, in several\nsenses. We present the details underlying our earlier work which showed how\nthis phase arises. We display all nine quasiparticle dispersion relations in\nfull detail. Using a general pairing ansatz that only neglects effects that are\nknown to be small, we perform a comparison of the free energies of the gCFL,\nCFL, 2SC, gapless 2SC, and 2SCus phases. We conclude that as density drops,\nmaking the CFL phase less favored, the gCFL phase is the next spatially uniform\nquark matter phase to occur. A mixed phase made of colored components would\nhave lower free energy if color were a global symmetry, but in QCD such a mixed\nphase is penalized severely.", "positive": "Hadron production in lepton-nuclei interactions at high energies: Monte\n Carlo generator HARDPING 2.0: Hadron production in lepton-nucleus interactions at high-energies is\nconsidered in framework of developing Monte Carlo event generator HARDPING\n(HARD Probe INteraction Generator). Such effects as formation length, energy\nloss and multiple rescattering for produced hadrons and their constituents are\nimplemented into the HARDPING 2.0. Available data from HERMES collaboration on\nhadron production in lepton-nucleus collisions are described by the present\nversion of the HARDPING generator in a reasonable agreement." }, { "anchor": "Unconventional phenomenology of a minimal two-Higgs-doublet model: Two-Higgs-doublet models (2HDM) are simple extensions of the Standard Model\n(SM) where the scalar sector is enlarged by adding a weak doublet. As a result,\nthe Higgs potential depends in general on several free parameters which have to\nbe carefully chosen to give predictions consistent with the current precision\ndata. We consider a 2HDM invariant under a twisted custodial symmetry and\ndepending only on three extra parameters beyond the SM ones. This model\nnaturally features an inverted mass spectrum with a light pseudoscalar state\nand a heavy SM-like Higgs boson. We thoroughly analyze direct and indirect\nconstraints and present a few unconventional though promising signatures at the\nLHC.", "positive": "Gamma Ray Burst Neutrinos Probing Quantum Gravity: Very high energy, short wavelength, neutrinos may interact with the\nspace-time foam predicted by theories of quantum gravity. They would propagate\nlike light through a crystal lattice and be delayed, with the delay depending\non the energy. This will appear to the observer as a violation of Lorenz\ninvariance. Back of the envelope calculations imply that observations of\nneutrinos produced by gamma ray bursts may reach Planck-scale sensitivity. We\nrevisit the problem considering two essential complications: the imprecise\ntiming of the neutrinos associated with their poorly understood production\nmechanism in the source and the indirect nature of their energy measurement\nmade by high energy neutrino telescopes." }, { "anchor": "Why the Very High Multiplicity events are rare: The possibility to suppress the nonperturbative effects choosing the vary\nhigh multiplicity final state is discussed. The theoretical uncertainties and\nthe experimental observable consequence of this choice are discussed.", "positive": "Impact of the higher twist effects on the $\u03b3\u03b3^{*} \\to \u03c0^{0}$\n transition form factor: We reanalyze the $\\gamma\\gamma^{*} \\to \\pi^{0}$ transition form factor\n$F_{\\pi\\gamma}(Q^2)$ within the QCD light-cone sum rules method with the\ntwist-4 accuracy. In computations the pion leading twist distribution amplitude\n(DA) with two nonasymptotic terms, and the renormalon method-inspired twist-4\nDAs are used. The latters allow us to estimate impact of effects due to higher\nconformal spin components in the pion twist-4 DAs on the form factor\n$F_{\\pi\\gamma}(Q^2)$. Obtained theoretical predictions are employed to deduce\nconstraints on the pion DAs from CELLO and CLEO data." }, { "anchor": "The light U boson as the mediator of a new force, coupled to a\n combination of Q, B, L and dark matter: A new light gauge boson $U$ may have both vector and axial couplings. In a\nlarge class of theories however, the new $U(1)$ current $J^\\mu_F$ naturally\ncombines with the weak neutral current $J^\\mu_{Z_{\\rm sm}}$, both\nparity-violating, into a vectorial current $J^\\mu_U$, combination of the\n$B,\\,L$ and electromagnetic currents with a possible dark matter current.\n $U^\\mu $ may be expressed equivalently as $\\cos\\xi \\,C^\\mu\\! + \\sin \\xi\n\\,Z^\\mu_{\\rm \\,sm}$ (\"mixing with the $Z$\") or $(1/\\cos\\chi) \\,\\hat\nC^\\mu+\\tan\\chi \\,A^\\mu$ (\"mixing with the photon\"), with $\\hat C$ coupled to\n$B,\\,L$ and dark matter. The $U$ boson may be viewed as a generalized dark\nphoton, coupled to SM particles through $Q_U=Q+\\lambda_B B+\\lambda_i L_i$, with\nstrength $\\,g\"\\cos\\xi\\,\\cos^2\\theta=e\\tan\\chi$. \"Kinetic mixing\" terms, gauge\ninvariant or not, simply correspond to a description in a non-orthogonal field\nbasis (rather than to a new physical effect), with the dark photon in general\nalso coupled to $B$ and $L$.\n In a grand-unified theory $\\,Q_U^{\\rm gut}=Q-2\\,(B-L)\\,$ at the GUT scale for\nSM particles, invariant under the $SU(4)$ electrostrong symmetry group, with a\nnon-vanishing $\\epsilon = \\tan\\chi$ already present at the GUT scale, leading\nto $Q_U\\simeq \\,Q-1.64\\, (B-L)\\,$ at low energy. This also applies, for a very\nlight or massless $U$ boson, to a new long-range force, which could show up\nthrough apparent violations of the Equivalence Principle.", "positive": "Direct CP Violation in K_L --> \u03c0^0 e^+e^- Beyond Leading Logarithms: We analyze the direct CP violation in the rare decay K_L --> Pi^0 e+e- with\nQCD effects taken into account consistently in the next-to-leading order. We\ncalculate the two-loop mixing between the four-quark \\Delta S=1 operators and\nthe operator Q_7V = (sd)_(V-A)(ee)_V in the NDR and HV renormalization schemes.\nUsing the known two-loop anomalous dimension matrix of the four-quark\noperators, we find that the coefficient C_7V(\\mu) depends only very weakly on\n\\mu, renormalization scheme and \\Lambda_MSbar. The next-to-leading QCD\ncorrections enhance the direct CP violating contribution over its leading order\nestimate so that it remains dominant in spite of the recent decrease of\n|V_ub/V_cb| and |V_cb|. We expect typically BR(K_L --> \\pi^0 e^+ e^-)_dir ~\n6*10^(-12), although values as high as 10^(-11) are not yet excluded." }, { "anchor": "Determination of alpha_s from the QCD static energy: We compare lattice data for the short-distance part of the static energy in\n2+1 flavor quantum chromodynamics (QCD) with perturbative calculations, up to\nnext-to-next-to-next-to leading-logarithmic accuracy. We show that perturbation\ntheory describes very well the lattice data at short distances, and exploit\nthis fact to obtain a determination of the product of the lattice scale r_0\nwith the QCD scale Lambda_{MS}. With the input of the value of r_0, this\nprovides a determination of the strong coupling alpha_s at the typical distance\nscale of the lattice data. We obtain alpha_s(1.5 GeV)=0.326\\pm0.019, which\nprovides a novel determination of alpha_s at low energy and with three-loop\naccuracy (including resummation of the leading ultrasoft logarithms). When this\nvalue is evolved to the Z-mass scale M_Z, it corresponds to\nalpha_s(M_Z)=0.1156^{+0.0021}_{-0.0022}.", "positive": "The nonet of the light scalar tetraquarks: the mesons $a_0(980)$ and\n $K_{0}^{\\ast }(800)$: The spectroscopic parameters and partial decay widths of the light mesons $\na_0(980) $ and $K_{0}^{\\ast}(800)$ are calculated by treating them as scalar\ndiquark-antidiquark states. The masses and couplings of the mesons are found in\nthe framework of QCD two-point sum rule approach. The widths of the decay\nchannels $a_0(980) \\to \\eta \\pi$ and $a_0(980) \\to K \\bar{K}$, and $\nK_{0}^{\\ast}(800) \\to K^{+} \\pi^{-}$ and $K_{0}^{\\ast}(800) \\to K^{0} \\pi^{0} $\nare evaluated using QCD sum rules on the light-cone and technical tools of the\nsoft meson approximation. Our results for the mass of the mesons\n$m_{a_0}=991^{+29}_{-27} \\ \\mathrm{MeV}$ and $m_{K^{ \\ast}}=767^{+38}_{-29} \\\n\\mathrm{MeV}$, as well as their total width $\\Gamma _{\\mathrm{a_0}}=62.01\\pm\n14.37\\ \\mathrm{MeV}$ and $\\Gamma _{\\mathrm{ K_0^{\\ast}}}=401.1\\pm 87.1\\\n\\mathrm{MeV}$ are compared with last experimental data." }, { "anchor": "Searching for the Lightest Neutralino at Fixed Target Experiments: Most ongoing supersymmetry searches have concentrated on the high-energy\nfrontier. High-intensity fixed target beamlines, however, offer an opportunity\nto search for supersymmetric particles with long lifetimes and low\ncross-sections in regions complementary to the ones accessible to collider\nexperiments. In this paper, we consider R-parity violating supersymmetry\nsearches for the lightest neutralino and use the NuTeV experiment as an example\nfor the experimental sensitivity which can be achieved.", "positive": "Electroweak baryogenesis in a scale invariant model and Higgs\n phenomenology: We study the electroweak phase transition and the critical bubble in the\nscale-invariant two Higgs doublet model taking the recent LHC data into\naccount. The sphaleron energy in this model is evaluated for the first time. It\nis found that the strong first-order electroweak phase transition is the\ninevitable consequence to be consistent with the observed 125 GeV Higgs boson.\nIn such a case, the signal strength of the Higgs decay to two gammas and the\ntriple Higgs boson coupling could deviate from the SM values by $-10$% and\n$+82$%, respectively." }, { "anchor": "Factorization is not violated: We show that existing proofs of factorization imply the cancellation of\ncertain multiladder contributions that Gotsman, Levin, and Maor had suggested\nwould invalidate the basic factorization theorem in QCD. No modifications of\nthe original argument are necessary, although the details of the example offer\nuseful insight into the mechanisms of factorization.", "positive": "Isospin asymmetry in holographic baryonic matter: We study baryonic matter with isospin asymmetry, including fully dynamically\nits interplay with pion condensation. To this end, we employ the holographic\nWitten-Sakai-Sugimoto model and the so-called homogeneous ansatz for the gauge\nfields in the bulk to describe baryonic matter. Within the confined geometry\nand restricting ourselves to the chiral limit, we map out the phase structure\nin the presence of baryon and isospin chemical potentials, showing that for\nsufficiently large chemical potentials condensed pions and isospin-asymmetric\nbaryonic matter coexist. We also present first results of the same approach in\nthe deconfined geometry and demonstrate that this case, albeit technically more\ninvolved, is better suited for comparisons with and predictions for real-world\nQCD. Our study lays the ground for future improved holographic studies aiming\ntowards a realistic description of charge neutral, beta-equilibrated matter in\ncompact stars, and also for more refined comparisons with lattice studies at\nnonzero isospin chemical potential." }, { "anchor": "Proton-proton interactions at the Highest Energies: the Grey-Disk and\n the Core-Corona models: In this letter, the Grey-Disk and the Core-Corona models are combined in a\nscenario that aims to explain different unexpected features observed in the\ninteractions of the highest energy particles in the Earth's atmosphere. In\nparticular, the observed distributions of $X_{\\rm max}$ and $N_\\mu$ are\nexplained, assuming that the ultra-high-energy cosmic ray spectrum is dominated\nby protons produced by a few extra-galactic sources with different injection\nspectra and maximum energy cutoffs. The compliance of this heterodox scenario\nwith other relevant observations as the instep region in the energy spectrum,\nthe event-by-event correlations between $X_{\\rm max}$ and the detected signal\nat the ground and the absence of detection, so far, of UHE neutrinos or\nphotons, are also briefly discussed. If confirmed, such a scenario would\ndramatically change the present understanding of the UHECR primary composition\nand, thus, the characteristics of their sources.", "positive": "A step toward CNO solar neutrinos detection in liquid scintillators: The detection of CNO solar neutrinos in ultrapure liquid scintillator\ndetectors is limited by the background produced by Bismuth-210 nuclei that\nundergo beta-decay to Polonium-210 with a lifetime equal to about 7 days.\nPolonium-210 nuclei are unstable and decay with a lifetime equal to about 200\ndays emitting alpha particles that can be also detected. In this letter, we\nshow that the Bi-210 background can be determined by looking at the time\nevolution of alpha-decay rate of Po-210, provided that alpha particle detection\nefficiency is stable over the data acquisition period and external sources of\nPo-210 are negligible. A sufficient accuracy can be obtained in a relatively\nshort time. As an example, if the initial Po-210 event rate is 2000 cpd/100 ton\nor lower, a Borexino-like detector could start discerning CNO neutrino signal\nfrom Bi-210 background in about 1 yr." }, { "anchor": "Selected strong decay modes of Y(4260): In present work the Y(4260) resonance is considered as a weakly bound state\nof a pseudoscalar D and an axial D1 charm meson. We consider the two-body decay\nY(4260) -> Zc(3900) + pi where Zc(3900) is treated as hadron molecule as well.\nMoreover we compute the Y(4260) decay modes J/psi pi(+) pi(-), recently\nobserved by the BESIII Collaboration, and psi(2S) pi(+) pi(-). In the last\nprocess both the contact diagram with D D1 -> psi(nS) pi(+) pi(-) and the\nresonance diagram with D D1 -> Zc(3900) + pi -> psi(nS) pi(+) pi(-) are taken\ninto account.", "positive": "Non-Perturbative Contribution to the Thrust Distribution in $e^+ e^-$\n Annihilation: We re-evaluate the non-perturbative contribution to the thrust distribution\nin $e^+e^-\\to$ hadrons, in the light of the latest experimental data and the\nrecent NNLO perturbative calculation of this quantity. By extending the\ncalculation to NNLO+NLL accuracy, we perform the most detailed study to date of\nthe effects of non-perturbative physics on this observable. In particular, we\ninvestigate how well a model based on a low-scale QCD effective coupling can\naccount for such effects. We find that the difference between the improved\nperturbative distribution and the experimental data is consistent with a\n$1/Q$-dependent non-perturbative shift in the distribution, as predicted by the\neffective coupling model. Best fit values of $\\alpha_s(M_Z) =\n0.1164^{+0.0028}_{-0.0026}$ and $\\alpha_0(2 GeV)=0.59+/-0.03$ are obtained with\n$\\chi^2/d.o.f.=1.09$. This is consistent with NLO+NLL results but the quality\nof fit is improved. The agreement in $\\alpha_0$ is non-trivial because a part\nof the 1/Q-dependent contribution (the infrared renormalon) is included in the\nNNLO perturbative correction." }, { "anchor": "Does a band structure affect sphaleron processes?: Inspired by a recent work of Tye and Wong, we examine an effect of a band\nstructure on baryon number preservation criteria requisite for successful\nelectroweak baryogenesis. Action of a reduced model is fully constructed\nincluding a time component of the gauge field that is missing in the original\nwork. The band structure is estimated more precisely in wider energy range\nbased on WKB framework with three connection formulas to find that the band\nstructure has little effect on the criteria at around 100 GeV temperature. We\nalso address an issue of suppression factors peculiar to the $(B+L)$-changing\nprocess in high-energy collisions at zero temperature.", "positive": "Generation of hypermagnetic helicity and leptogenesis in early universe: We study hypermagnetic helicity and lepton asymmetry evolution in plasma of\nthe early Universe before the electroweak phase transition (EWPT) accounting\nfor chirality flip processes via inverse Higgs decays and sphaleron transitions\nwhich violate the left lepton number and wash out the baryon asymmetry of the\nUniverse (BAU). In the scenario where the right electron asymmetry supports the\nBAU alone through the conservation law $B/3 - L_{eR}=const$ at temperatures\n$T>T_{RL}\\simeq 10~TeV$ the following universe cooling leads to the production\nof a non-zero left lepton (electrons and neutrinos) asymmetry. This is due to\nthe Higgs decays becoming more faster when entering the equilibrium at\n$T=T_{RL}$ with the universe expansion, $\\Gamma_{RL}\\sim T> H\\sim T^2$ ,\nresulting in the parallel evolution of the right and the left electron\nasymmetries at $T~5 TeV." }, { "anchor": "Diffractive Deep Inelastic Scattering: the hadronic nature of Quarks: In the framework of Anisotropic Chromo Dynamics, a non-perturbative model of\nQCD based on magnetic condensation in the vacuum, we develope a picture of the\nPomeron. Within this model we are able to calculate the diffractive\ncontribution to deep inelastic scattering in the small Bjorken x region,\nactually probed at Hera. We calculate the diffractive structure function of the\nproton and make the comparison with the experimental data of Zeus and H1\ncollaborations. Good agreement with the experimental data, both for the\ndiffractive structure function $F_2^D$ and for the ''structure function'' of\nthe Pomeron, is achieved.", "positive": "Fluctuation induced first order phase transition in U(n)xU(n) models\n using chiral invariant expansion of functional renormalization group flows: Phase transition in U(n)xU(n) models is investigated for arbitrary flavor\nnumber n. We present a nonperturbative, 3+1 dimensional finite temperature\ntreatment of obtaining the effective potential, based on a chiral invariant\nexpansion of the functional renormalization group flows. The obtained tower of\nequations is similar but not identical to that of the Dyson-Schwinger hierarchy\nand has to be truncated for practical purposes. We investigate the finite\ntemperature behavior of the system in an expansive set of the parameter space\nfor n = 2, 3, 4 and also perform a large-n analysis. Our method is capable of\nrecovering the one-loop beta functions of the coupling constants of the epsilon\nexpansion; furthermore, it shows direct evidence that regardless of the actual\nflavor number, within our approximation, the system undergoes a fluctuation\ninduced first order phase transition." }, { "anchor": "Resonance production in Pomeron-Pomeron collisions at the LHC: A Regge pole model for Pomeron-Pomeron total cross section in the resonance\nregion $\\sqrt{M^2}\\le$ 5 GeV is presented. The cross section is saturated by\ndirect-channel contributions from the Pomeron as well as from two different $f$\ntrajectories, accompanied by the isolated f$_0(500)$ resonance which dominates\nthe $\\sqrt{M^{2}}\\lesssim 1$ GeV region. A slowly varying background is taken\ninto account. The calculated Pomeron-Pomeron total cross section cannot be\nmeasured directly, but is an essential part of central diffractive processes.\nIn preparation of future calculations of central resonance production at the\nhadron level, and corresponding measurements at the LHC, we normalize the\nPomeron-Pomeron cross section at large masses $\\sigma_{t}^{PP}\n(\\sqrt{M^2}\\rightarrow \\infty) \\approx$ 1 mb as suggested by QCD-motivated\nestimates.", "positive": "Composite Higgs models in disguise: We present a mechanism for disguising one composite Higgs model as another.\nAllowing the global symmetry of the strong sector to be broken by large mixings\nwith elementary fields, we show that we can disguise one coset $\\mathcal\nG/\\mathcal H$ such that at low energies the phenomenology of the model is\nbetter described with a different coset $\\mathcal G'/\\mathcal H'$. Extra scalar\nfields acquire masses comparable to the rest of the strong sector resonances\nand therefore are no longer considered pNGBs. Following this procedure we\ndemonstrate that two models with promising UV-completions can be disguised as\nthe more minimal $SO(5)/SO(4)$ coset." }, { "anchor": "Cosmology in a supersymmetric model with gauged $B-L$: We consider salient cosmological features of a supersymmetric model which is\nLeft-Right symmetric and therefore possessing gauged $B-L$ symmetry. The\nrequirement of breaking parity and also obtaining charge preserving vacua\nintroduces some unique features to this model (MSLRM), resulting in a\npreference for non-thermal Leptogenesis. Assuming that the model preserves TeV\nscale supersymmetry, we show that the vacuum structure generically possesses\ndomain walls, which can serve two important purposes. They can signal a\nsecondary inflation required to remove unwanted relics such as gravitino and\nmoduli and also generate lepton asymmetry by a mechanism similar to electroweak\nbaryogenesis. The requirement of disappearance of domain walls imposes\nconstraints on the soft parameters of the theory, testable at the TeV scale. We\nalso propose an alternative model with spontaneous parity violation\n(MSLR\\rlap/P). Incorporating the same cosmological considerations in this case\nentails constraints on a different set of soft parameters.", "positive": "$\u03c4$ polarization and Randall-Sundrum scenario at $e^+e^-$ colliders: We study polarized cross-sections and forward-backward asymmetry for the\nprocess $e^+e-\\to \\tau^+\\tau^-$ in the stabilized Randall-Sundrum scenario. It\nis shown that there is substantial deviation from the Standard Model\npredictions, both in terms of the actual numerical values and angular\ndistributions." }, { "anchor": "Chiral phase transition and kaon-to-pion ratios in the entanglement\n SU(3) PNJL model: Within the three-flavor PNJL and EPNJL chiral quark models we have obtained\npseudoscalar meson properties in quark matter at finite temperature $T$ and\nbaryochemical potential $\\mu_B$. We compare the meson pole (Breit-Wigner)\napproximation with the Beth-Uhlenbeck (BU) approach that takes into account the\ncontinuum of quark-antiquark scattering states when determining the partial\ndensities of pions and kaons. We evaluate the kaon-to-pion ratios along the\n(pseudo-)critical line in the $T-\\mu_B$ plane as a proxy for the chemical\nfreezeout line, whereby the variable $x=T/\\mu_B$ is introduced that corresponds\nto the conserved entropy per baryon as initial condition for the heavy-ion\ncollision experiments. We present a comparison with the experimental pattern of\nkaon-to-pion ratios within the BU approach and using $x$-dependent pion and\nstrange quark potentials. A sharp \"horn\" effect in the energy dependence\n$K^+/\\pi^+$ ratio is explained by the enhanced pion production at energies\nabove $\\sqrt{s_{NN}}=8$ GeV, when the system enters the regime of meson\ndominance. This effect is in line with the enhancement of low-momentum pion\nspectra that is discussed as a precursor of the pion Bose condensation and\nentails the occurrence of a nonequilibrium pion chemical potential of the order\nof the pion mass. We elucidate that the horn effect is not related to the\nexistence of a critical endpoint in the QCD phase diagram.", "positive": "Collinear fragmentation at NNLL: generating functionals, groomed\n correlators and angularities: Jet calculus offers a unique mathematical technique to bridge the area of QCD\nresummation with Monte Carlo parton showers. With the ultimate goal of\nconstructing next-to-next-to-leading logarithmic (NNLL) parton showers we\nstudy, using the language of generating functionals, the collinear\nfragmentation of final-state partons. In particular, we focus on the definition\nand calculation of the Sudakov form factor, which physically describes the\nno-emission probability in an ordered branching process. We review recent\nresults for quark jets and compute the Sudakov form factor for the collinear\nfragmentation of gluon jets at NNLL. The NNLL corrections are encoded in a $z$\ndependent two-loop anomalous dimension $B_2(z)$, with $z$ being a suitably\ndefined longitudinal momentum fraction. This is obtained from the integration\nof the relevant $1\\to 3$ collinear splitting kernels combined with the one-loop\ncorrections to the $1\\to 2$ counterpart. This work provides the missing\ningredients to extend the methods of jet calculus in the collinear limit to\nNNLL and gives an important element of the next generation of NNLL parton\nshower algorithms. As an application we derive new NNLL results for both the\nfractional moments of energy-energy correlation $FC_x$ and the angularities\n$\\lambda_x$ measured on mMDT/Soft-Drop ($\\beta=0$) groomed jets." }, { "anchor": "Dipole factorization for DIS at NLO I: Loop correction to the photon to\n quark-antiquark light-front wave-functions: The one-loop QCD corrections to the light-front wave-function for the\nquark-antiquark Fock state inside a transverse or longitudinal off-shell photon\nare explicitly calculated, both in full momentum space and in mixed space\n(a.k.a. dipole space). These results provide one of the main contributions to\nvirtual NLO corrections to many DIS observables (inclusive or not) in the\ndipole factorization formalism at low Bjorken x.\n In a follow-up article, these one-loop corrections are combined with earlier\nresults on the wave-function for the quark-antiquark-gluon Fock state, in order\nto get the full set of NLO corrections to the DIS structure functions $F_2$ and\n$F_L$ in the dipole factorization formalism, valid at low Bjorken x.", "positive": "Long-lived Charginos in the Focus-point Region of the MSSM Parameter\n Space: We analyse the possibility to get light long-lived charginos within the\nframework of the MSSM with gravity mediated SUSY breaking. We find out that\nthis possibility can be realized in the so-called focus-point region of\nparameter space. The mass degeneracy of higgsino-like chargino and two\nhiggsino-like neutralinos is the necessary condition for a long lifetime. It\nrequires the fine-tuning of parameters, but being a single additional\nconstraint in the whole parameter space it can be fulfilled in the Constrained\nMSSM along the border line where radiative electroweak symmetry breaking fails.\nIn a narrow band close to the border line the charginos are long-lived\nparticles. The cross-sections of their production and co-production at the LHC\nvia electroweak interaction reach a few tenth of pb." }, { "anchor": "QCD Sum Rules at High Temperature: We generalize the sum rule approach to investigate the nonperturbative\nstructure of QCD at high temperature. Salient features of the QCD phase above\n$T_c$ are discussed, and included in the form of power corrections or\ncondensate insertions, in an operator product expansion of gauge invariant\ncorrelators. It is shown that for a plausible choice of condensates, QCD at\nhigh temperature exhibits color singlet excitations in the vector channels, as\nopposed to merely screened quarks and gluons.", "positive": "Global Analysis of Fragmentation Functions for Protons and Charged\n Hadrons: We present new sets of fragmentation functions for protons and inclusive\ncharged hadrons obtained in combined NLO QCD analyses of single-inclusive\nhadron production in electron-positron annihilation, proton-proton collisions,\nand deep-inelastic lepton-proton scattering. These analyses complement previous\nresults for pion and kaon fragmentation functions with charge and flavor\ndiscrimination. The Lagrange multiplier technique is used to assess the\nuncertainties in the extraction of the new sets of fragmentation functions." }, { "anchor": "Parity doubling of baryons in a chiral approach with three flavors: We formulate a set of mass relations for the baryon octet and decuplet with\npositive and negative parity in terms of the order parameter of QCD chiral\nsymmetry. The Gell-Mann--Okubo mass formula and Gell-Mann's equal spacing rule\nhold manifestly in this approach. Thermal masses of the baryons are calculated\nin the mean field approximation for various pion masses, and the results are\ncompared with the recent lattice studies. A general trend of the nucleon,\n$\\Delta$ and $\\Omega$ parity-doublers seen in the available lattice data can be\nunderstood qualitatively. Expected mass modifications of other strange baryons\nare also given with the physical and heavier pion masses.", "positive": "Dynamical Evolution of Gravitational Leptogenesis: Radiatively-induced gravitational leptogenesis is a potential mechanism to\nexplain the observed matter-antimatter asymmetry of the universe. Gravitational\ntidal effects at the quantum loop level modify the dynamics of the leptons in\ncurved spacetime and may be encoded in a low-energy effective action Seff. It\nhas been shown in previous work how in a high-scale BSM theory the CP odd\ncurvature-induced interactions in Seff modify the dispersion relations of\nleptons and antileptons differently in an expanding universe, giving rise to an\neffective chemical potential and a non-vanishing equilibrium lepton-antilepton\nasymmetry. In this paper, the CP even curvature interactions are shown to break\nlepton number current conservation and modify the evolution of the lepton\nnumber density as the universe expands. These effects are implemented in a\ngeneralised Boltzmann equation and used to trace the dynamical evolution of the\nlepton number density in different cosmological scenarios. The theory predicts\na potentially significant gravitationally-induced lepton-antilepton asymmetry\nat very early times in the evolution of the universe." }, { "anchor": "Diagnosing the Reactor Antineutrino Anomaly with Global Antineutrino\n Flux Data: We have examined the impact of new Daya Bay, Double Chooz, and RENO\nmeasurements on global fits of reactor antineutrino flux data to a variety of\nhypotheses regarding the origin of the reactor antineutrino anomaly. In\ncomparing RENO and Daya Bay measurements of inverse beta decay (IBD) yield\nversus $^{239}$Pu fission fraction, we find differing levels of precision in\nmeasurements of time-integrated yield and yield slope, but similar central\nvalues, leading to modestly enhanced isotopic IBD yield measurements in a joint\nfit of the two datasets. In the absence of sterile neutrino oscillations,\nglobal fits to all measurements now provide 3{\\sigma} preference for incorrect\nmodeling of specific fission isotopes over common mis-modeling of all\nbeta-converted isotopes. If sterile neutrino oscillations are considered,\nglobal IBD yield fits provide no substantial preference between\noscillation-including and oscillation-excluding hypotheses: hybrid models\ncontaining both sterile neutrino oscillations and incorrect $^{235}$U or\n$^{239}$Pu flux predictions are favored at only 1-2{\\sigma} with respect to\nmodels where $^{235}$U, $^{238}$U, and $^{239}$Pu are assumed to be incorrectly\npredicted.", "positive": "On technically solving an effective QCD-Hamiltonian: By their very nature, field-theoretical Hamiltonians are derived in momentum\nrepresentation. To solve the corresponding integro-differential equations is\nmore difficult than to solve the simpler differential equations in\nconfiguration space (`Schr\\\"odinger equation'). For the latter many different\nand very effective methods have been developed in the past. But rather than to\nFourier-transform to configuration space - which is not always easy - the\nequations are solved here directly in momentum space, by using Gaussian\nquadratures. Special attention is given to the case where the potential in\nconfiguration space is linear and where the corresponding momentum-space kernel\nhas an almost intractable 1/(\\vec k - \\vec k')^4 -singularity. Its\nregularization requires a certain technical effort, introducing suitable\ncounter terms. The method is numerically reliable and fast, faster than other\nmethods in the literature. It should be useful to and also applicable in other\napproaches, including phenomenological Schr\\\"odinger-type equations." }, { "anchor": "Probing Models of Neutrino Masses via the Flavor Structure of the Mass\n Matrix: We discuss what kinds of combinations of Yukawa interactions can generate the\nMajorana neutrino mass matrix. We concentrate on the flavor structure of the\nneutrino mass matrix because it does not depend on details of the models except\nfor Yukawa interactions while determination of the overall scale of the mass\nmatrix requires to specify also the scalar potential and masses of new\nparticles. Thus, models to generate Majorana neutrino mass matrix can be\nefficiently classified according to the combination of Yukawa interactions. We\nfirst investigate the case where Yukawa interactions with only leptons are\nutilized. Next, we consider the case with Yukawa interactions between leptons\nand gauge singlet fermions, which have the odd parity under the unbroken Z_2\nsymmetry. We show that combinations of Yukawa interactions for these cases can\nbe classified into only three groups. Our classification would be useful for\nthe efficient discrimination of models via experimental tests for not each\nmodel but just three groups of models.", "positive": "Pion Form Factor in the NLC QCD SR approach: We present results of a calculation of the electromagnetic pion form factor\nwithin a framework of QCD Sum Rules with nonlocal condensates and using a\nperturbative spectral density which includes \\mathcal{O}(\\alpha_s)\ncontributions." }, { "anchor": "Chiral Lagrangian with confinement from the QCD Lagrangian: An effective Lagrangian for the light quark in the field of a static source\nis derived systematically using the exact field correlator expansion. The\nlowest Gaussian term is bosonized using nonlocal colorless bosonic fields and a\ngeneral structure of effective chiral Lagrangian is obtained containing all set\nof fields. The new and crucial result is that the condensation of scalar\nisoscalar field which is a usual onset of chiral symmetry breaking and is\nconstant in space-time, assumes here the form of the confining string and\ncontributes to the confining potential, while the rest bosonic fields describe\nmesons with the q\\bar q quark structure and pseudoscalars play the role of\nNambu-Goldstone fields. Using derivative expansion the effective chiral\nLagrangian is deduced containing both confinement and chiral effects for\nheavy-light mesons. The pseudovector quark coupling constant is computed to be\nexactly unity in the local limit,in agreement with earlier large N_c arguments.", "positive": "Mass spectra of bottom-charm baryons: In this paper, we investigate the mass spectra of bottom-charm baryons\nsystematically, where the relativistic quark model and the infinitesimally\nshifted Gaussian basis function method are employed. Our calculation shows that\nthe $\\rho$-mode appears lower in energy than the other excited modes. According\nto this feature, the allowed quantum states are selected and a systematic study\nof the mass spectra for $\\Xi_{bc}^{'}$ ($\\Xi_{bc}$) and $\\Omega_{bc}^{'}$\n($\\Omega_{bc}$) families is performed. The root mean square radii and quark\nradial probability density distributions of these baryons are analyzed as well.\nNext, the Regge trajectories in the $(J,M^{2})$ plane are successfully\nconstructed based on the mass spectra. At last, we present the structures of\nthe mass spectra, and analyze the difficulty and opportunity in searching for\nthe ground states of bottom-charm baryons in experiment." }, { "anchor": "Search for hidden particles in intensity frontier experiment SHiP: Despite the undeniable success of the Standard Model of particle physics (SM)\nthere are some phenomena (neutrino oscillations, baryon asymmetry of the\nUniverse, dark matter, etc.) that SM cannot explain. These phenomena indicate\nthat the SM has to be modified. Most likely there are new particles beyond the\nSM. There are many experiments to search for new physics that can be divided\ninto two types: energy and intensity frontier. In experiments of the first\ntype, one tries to directly produce and detect new heavy particles. In\nexperiments of the second type, one tries to directly produce and detect new\nlight particles that feebly interact with SM particles. Future intensity\nfrontier SHiP experiment (\\textbf{S}earch for \\textbf{Hi}dden\n\\textbf{P}articles) at the CERN SPS is discussed. Its advantages and technical\ncharacteristics are given.", "positive": "Exotic States in a Holographic Theory: Supersymmetric Light Front Holographic QCD is a holographic theory, which not\nonly describes the spectroscopy of mesons and baryons, but also predicts the\nexistence and spectroscopy of tetraquarks. A discussion of the limitations of\nthe theory is also presented." }, { "anchor": "Charged-particle multiplicity dependence of charm-baryon-to-meson ratio\n in high-energy proton-proton collisions: We propose that the charged-particle multiplicity dependence of the\ncharm-baryon-to-meson ratio observed in high-energy $pp$ collisions can be\nexplained by canonical treatment of quantum charges in the statistical\nhadronization model (SHM). Taking the full particle listings of PDG\ncomplemented by additional charm-baryon states from relativistic quark model\npredictions, we evaluate the canonical partition function and the charm-hadron\nchemical factors that measure the canonical suppression arising from the\nrequirement of strict conservation of quantum charges. We demonstrate that,\nwhile charm number conservation induces common suppression on the production of\nboth charm-baryons and -mesons, baryon (strangeness) number conservation causes\nfurther suppression on charm-baryons (charm-strange mesons) relative to\nnonstrange charm-mesons, thereby resulting in a decreasing $\\Lambda_c/D^0$\n($D_s/D^0$) ratio toward smaller multiplicity events. The charm-hadron thermal\ndensities thus computed are then used as pertinent weights to perform\ncharm-quark fragmentation simulations yielding $p_T$-dependent $\\Lambda_c/D^0$\nand $D_s/D^0$ ratios at varying multiplicities in fair agreement with ALICE\nmeasurements.", "positive": "Higgs production via gluon fusion from kT-factorisation: Theoretical studies of Higgs production via gluon fusion are frequently\ncarried out in the limit where the top quark mass is much larger than the Higgs\nmass, an approximation which reduces the top quark loop to an effective vertex.\nWe present a numerical analysis of the error thus introduced by performing a\nMonte Carlo calculation for gg->h in kT-factorisation, using the parton shower\ngenerator CASCADE. We proceed to compare CASCADE to the collinear Monte Carlos\nPYTHIA, MC@NLO and POWHEG. We study the dependence of parton radiation on the\nresummation of high-energy corrections taken into account by kT-factorisation,\nand its influence on predictions for the Higgs pT spectrum." }, { "anchor": "NRQCD: Fundamentals and Applications to Quarkonium Decay and Production: I discuss NRQCD and, in particular, the NRQCD factorization formalism for\nquarkonium production and decay. I also summarize the current status of the\ncomparison between the predictions of NRQCD factorization and experimental\nmeasurements.", "positive": "Statistical significance of the sterile-neutrino hypothesis in the\n context of reactor and gallium data: We evaluate the statistical significance of the 3+1 sterile-neutrino\nhypothesis using $\\nu_e$ and $\\bar\\nu_e$ disappearance data from reactor, solar\nand gallium radioactive source experiments. Concerning the latter, we\ninvestigate the implications of the recent BEST results. For reactor data we\nfocus on relative measurements independent of flux predictions. For the problem\nat hand, the usual $\\chi^2$-approximation to hypothesis testing based on Wilks'\ntheorem has been shown in the literature to be inaccurate. We therefore present\nresults based on Monte Carlo simulations, and find that this typically reduces\nthe significance by roughly $1\\,\\sigma$ with respect to the na\\\"ive\nexpectation. We find no significant indication in favor of sterile-neutrino\noscillations from reactor data. On the other hand, gallium data (dominated by\nthe BEST result) show more than $5\\,\\sigma$ of evidence supporting the\nsterile-neutrino hypothesis, favoring oscillation parameters in agreement with\nconstraints from reactor data. This explanation is, however, in significant\ntension ($\\sim 3\\,\\sigma$) with solar neutrino experiments. In order to assess\nthe robustness of the signal for gallium experiments we present a discussion of\nthe impact of cross-section uncertainties on the results." }, { "anchor": "Discovering New Physics in the Decays of Black Holes: If the scale of quantum gravity is near a TeV, the LHC will be producing one\nblack hole (BH) about every second, thus qualifying as a BH factory. With the\nHawking temperature of a few hundred GeV, these rapidly evaporating BHs may\nproduce new, undiscovered particles with masses ~100 GeV. The probability of\nproducing a heavy particle in the decay depends on its mass only weakly, in\ncontrast with the exponentially suppressed direct production. Furthemore, BH\ndecays with at least one prompt charged lepton or photon correspond to the\nfinal states with low background. Using the Higgs boson as an example, we show\nthat it may be found at the LHC on the first day of its operation, even with\nincomplete detectors.", "positive": "B-Physics: Theoretical Predictions in the LHC Era: We discuss the status of the theoretical predictions of some interesting\nb-physics observables that are sensitive to New Physics and can be measured at\nthe LHC." }, { "anchor": "Photon-jet ridge at RHIC and the LHC: We investigate long range rapidity correlations of pairs of prompt photon and\njet in the Color Glass Condensate (CGC) framework in proton-proton and\nproton-nucleus collisions at RHIC and the LHC. We show that photon-jet\ncorrelations exhibit long-range azimuthal collimation at near-side for low\ntransverse momenta of the produced photon and jet in high-multiplicity events.\nThese ridge-like features are strikingly similar to the observed ridge effect\nfor di-hadron correlations at RHIC and the LHC. We show that correlations in\nthe relative rapidity and the relative azimuthal angle between pairs of prompt\nphoton and jet strongly depend on the gluon saturation dynamics at small-x\nkinematics and such measurements can help to understand the true origin of the\nobserved di-hadron ridge in p+A collisions, and address whether the ridge is a\nuniversal phenomenon for all two particle correlations at high energy and high\nmultiplicity events. We also investigate if there is a ridge-like structure for\nphoton-hadron pair correlations at RHIC and the LHC. We found that the\nhadronization of jet has non-trivial effects on the photon-jet correlations.", "positive": "Opacity dependence of elliptic flow in kinetic theory: The observation of large azimuthal anisotropies $v_n$ in the particle spectra\nof proton-proton (pp) and proton-nucleus (pA) collisions challenges fluid\ndynamic interpretations of $v_n$, as it remains unclear how small collision\nsystems can hydrodynamize and to what extent hydrodynamization is needed to\nbuild up $v_n$. Here, we study in a simple kinetic theory how the same physics\nthat leads to hydrodynamization in large systems represents itself in small\nsystems. We observe that one third to one half of the elliptic flow signal seen\nin fully hydrodynamized systems can be built up in collisions that extend over\nonly one mean free path $l_{\\rm mfp}$ and that do not hydrodynamize. This is\nqualitatively in line with observing a sizeable $v_2$ in $pp$ collisions for\nwhich other characteristics of soft multi-particle production seem\nwell-described in a free-streaming picture. We further expose a significant\nsystem size dependence in the accuracy of hybrid approaches that match kinetic\ntheory to viscous fluid dynamics. The implications of these findings for a\nreliable extraction of shear viscosity are discussed." }, { "anchor": "Nonperturbative Matching for Field Theories with Heavy Fermions: We examine a paradox, suggested by Banks and Dabholkar, concerning\nnonperturbative effects in an effective field theory which is obtained by\nintegrating out a generation of heavy fermions, where the heavy fermion masses\narise from Yukawa couplings. They argue that light fermions in the effective\ntheory appear to decay via instanton processes, whereas their decay is\nforbidden in the full theory. We resolve this paradox by showing that such\nprocesses in fact do not occur in the effective theory, due to matching\ncorrections which cause the relevant light field configurations to have\ninfinite action.", "positive": "Neutrino Mixing and Cosmological Constant above GUT Scale: Neutrino mixing lead to a non zero contribution to the cosmological constant.\nWe consider non renormalization $1/M_{x}$ interaction term as a perturbation of\nthe neutrino mass matrix. We find that for the degenerate neutrino mass\nspectrum. We assume that the neutrino masses and mixing arise through physics\nat a scale intermediate between Planck Scale and the electroweak scale. We also\nassume, above the electroweak breaking scale, neutrino masses are nearly\ndegenerate and their mixing is bimaximal. Quantum gravitational (Planck scale\n)effects lead to an effective $SU(2)_{L}\\times U(1)$ invariant dimension-5\nLagrangian involving neutrino and Higgs fields, which gives rise to additional\nterms in neutrino mass matrix. There additional term can be considered to be\nperturbation of the GUT scale bi-maximal neutrino mass matrix. We assume that\nthe gravitational interaction is flavour blind and we study the neutrino mixing\nand cosmological constant due to physics above the GUT scale." }, { "anchor": "Lepton polarization and CP-violating effects in $\\overline{B}\\rightarrow\n \\overline{K}_{0}^{*}(1430) \\ell^+\\ell^-$ Decay in Standard and Two Higgs\n Doublet Model: In this paper we analyze the dilepton mass square $q^2$ dependency of single\nlepton polarization asymmetries and CP violation for $\\overline{B}\\rightarrow\n\\overline{K}_0^{*}(1430) \\ell^+\\ell^-, \\ell=\\mu,\\tau)$ in the 2HDM context.\nAlso, we study the averages of these asymmetries in the domain $4\nm_{\\ell}^2