A Model for Fermion Mass Hierarchies and Mixings
P. Ramond
Abstract
We present a model which contains three Abelian symmetries beyond the standard model. One is anomalous \` a la Green-Schwarz, and family-independent; the other two are family symmetries. All are broken at a large scale by stringy effects. The model is predictive in the neutrino sector: large mixing between νμ-ντ, and O(λ3) νe-νμ mixings. Its natural cut-off is the gauge unification scale, orders of magnitude below the perturbative string cut-off.
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