Before the Standard Model was developed in the 1970s (the key elements of the Standard Model known as quarks were proposed by Murray Gell-Mann and George Zweig in 1964), physicists observed hundreds of different kinds of particles in particle accelerators.
Ennen kuin standardimalli oli kehitetty 1970-luvulla (avain standardimalliin oli kvarkit joita ehdottivat Murray Gell-Mann ja George Zweig 1964), fyysikot havaitsivat satoja erilaisia hiukkasia hiukkaskiihdyttimissä.