PREDICTIONS FROM AN ANOMALOUS U(1) MODEL OF YUKAWA HIERARCHIES - ART.NO. 035003

We present a supersymmetric standard model with three gauged Abelian s ymmetries of a type commonly found in superstrings. One is anomalous; the other two are Eg family symmetries. It has a vacuum in which only these symmetries are broken by stringy effects. It reproduces all obse rved quark and charged lepton Yukawa hierarchies and the value of the Weinberg angle. It predicts three massive neutrinos, with mixing that can explain both the small angle MSW effect and the atmospheric neutri no anomaly. The Cabibbo angle is expressed in terms of the gauge coupl ings at unification. It conserves R parity and proton decay is close t o experimental bounds. [S0556-2821(98)06513-8].