The Pati–Salam model is a theoretical framework in particle physics proposed by Rajiv Pati and Abdus Salam in the early 1970s. It is a unification model that aims to unify the electromagnetic, weak, and strong forces, and it extends the gauge group of the Standard Model to include more symmetry.
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A quark-lepton unification framework with conventional minimal gauge group . leptons supply a fourth color charge, and a right-handed neutrino completes each family. fermion masses additionally depend on symmetry breaking and Yukawa couplings.