Fermion masses and proton decay in string-inspired SU(4)*SU(2)^2*U(1)_X

Abstract

We present a supersymmetric model of fermion masses with SU(4)*SU(2)^2*U(1)_X gauge group with matter in fundamental and antisymmetric tensor representations only. The up, down, charged lepton and neutrino Yukawa matrices are distinguished by different Clebsch-Gordan coefficients due to contracting over SU(4) and SU(2)_R indices. We obtain a hierarchical light neutrino mass spectrum with bi-large mixing. The condition that anomalies be cancelled by a Green-Schwarz mechanism leads to fractional U(1)_X charges which exclude $B$ violation through dimension-4 and -5 operators.

arXiv comment4 pages, revtex 4, amsmath, amsfonts

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• Renormalization effects on neutrino masses and mixing in a string-inspired SU(4) X SU(2)_L X SU(2)_R X U(1)_X model
• Searching singlet extensions of the supersymmetric standard model in $Z_{6-II}$ orbifold compactification of heterotic string
• Running neutrino masses and mixing in a SU(4) x SU(2)^2 x U(1)_X model