Large Angle MSW Solution in Grand Unified Theories with SU(3) X U(1) Horizontal Symmetry
Ryuichiro Kitano, Yukihiro Mimura
Abstract
We construct a model with a SU(3) X U(1) horizontal symmetry in the context of Grand Unified Theories. In our models, the bi-maximal lepton mixing and suitable neutrino masses for the large angle MSW solution are obtained without any fine-tuning due to the spontaneously broken SU(3)H symmetry. The three generations of quarks and leptons are unified as members of the SU(3)H fundamental representation, and the U(1)H charge gives the origin of the fermion mass hierarchy and mixing angles. We present two explicit examples of SU(5)GUT and SO(10)GUT models, in which the Yukawa structures are given successfully.
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