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Atmospheric and Solar Neutrino Masses from Horizontal U(1) Symmetry
We study the neutrino mass matrix in supersymmetric models in which the quark
and charged lepton mass hierarchies and also the suppression of baryon or
lepton number violating couplings are all explained by horizontal
symmetry. It is found that the neutrino masses and mixing angles suggested by
recent atmospheric and solar neutrino experiments arise naturally in this
framework which fits in best with gauge-mediated supersymmetry breaking with
large . This framework highly favors the small angle MSW oscillation
of solar neutrinos, and determine the order of magnitudes of all the neutrino
mixing angles and mass hierarchies.Comment: No figures. 14 pages, revte