A Simple Grand Unification View of Neutrino Mixing and Fermion Mass Matrices

Abstract

Assuming three light neutrinos and the see-saw mechanism we present a semiquantitative model of fermion masses based on (SUSY) SU(5) and abelian horizontal charges. A good description of the observed pattern of quark and lepton masses is obtained. For neutrinos we naturally obtain widely split masses and large atmospheric neutrino mixing as a consequence of SU(5)-related asymmetric mass matrices for d quarks and charged leptons.

12 pages, LATEX, no figures; discussion added on the just-so solution; version to appear on Phys. Lett. B

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