Quark and lepton masses and mixing angles in a supersymmetric 422 model

Abstract

We discuss a specific supersymmetric model based on the gauge group SU(4) ⊗ SU(2)L ⊗ SU(2)R. In this model the gauge group is broken to that of the standard model at 1016 GeV, and supersymmetry is broken at low-energy. The model may be regarded as a “surrogate SUSY GUT”, and has several advantages over the SU(5) and SO(10) SUSY GUTs, such as the absence of the doublet-triplet splitting problem, and a simpler Higgs sector which does not involve any large Higgs representations. The model predicts full quadruple Yukawa unification (top-bottom-tau-tau neutrino), leading to the prediction of large top mass and tan β. An operator analysis leads to schemes where the strange and down mass are predicted.