A Minimal See-Saw Model for Hierarchical Neutrino Masses with Large Mixing
Abstract
The atmospheric and solar neutrino oscillation data suggest hierarchical neutrino masses with at least one large mixing. The simplest see-saw models for reconciling the two features are U(1) extensions of the SM with flavour dependent gauge charges. I discuss a minimal model of this type containing two heavy right-handed neutrinos, which have normal Dirac couplings to μ and τ but suppressed ones to e. It can naturally account for the large (small) mixing solutions to the atmospheric (solar) neutrino oscillation data.
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