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We construct a model with a SU(3) X U(1) horizontal symmetry in the contextof Grand Unified Theories. In our models, the bi-maximal lepton mixing andsuitable neutrino masses for the large angle MSW solution are obtained withoutany fine-tuning due to the spontaneously broken SU(3)_H symmetry. The threegenerations of quarks and leptons are unified as members of the SU(3)_Hfundamental representation, and the U(1)_H charge gives the origin of thefermion mass hierarchy and mixing angles. We present two explicit examples ofSU(5)_GUT and SO(10)_GUT models, in which the Yukawa structures are givensuccessfully.Comment: 23 pages, 6 figures, references adde

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Large angle MSW solution in grand unified theories with<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">SU</mml:mi><mml:mn /><mml:mo>(</mml:mo><mml:mn>3</mml:mn><mml:mo>)</mml:mo><mml:mn /><mml:mo>×</mml:mo><mml:mi mathvariant="normal">U</mml:mi><mml:mn /><mml:mo>(</mml:mo><mml:mn>1</mml:mn><mml:mo>)</mml:mo><mml:mn /></mml:math>horizontal symmetry

Large angle MSW solution in grand unified theories withSU(3)×U(1)horizontal symmetry