Abstract
A supersymmetric SO(10)xA(4) grand unified theory model is constructed for fermion masses and mixing by introducing a minimal set of low dimensional Higgs representations needed to break the gauge symmetry down to SU(3)(c)xU(1)(em). The hierarchy of fermion masses can be understood in the framework of A(4) symmetry. From the A(4)-invariant superpotential, the "double lopsided" mass matrices for the charged leptons and the down quarks are obtained. It is shown that this structure simultaneously leads to bi-large neutrino mixings and small Cabibbo-Kobayashi-Maskawa mixing angles. An excellent fit to the masses and mixings of the quarks and leptons as well as to the CP violation parameter is obtained. Moreover, the model predicts the neutrino mixing angle sin theta(13)approximate to 0.15.