A Minimal See-Saw Model for Hierarchical Neutrino Masses with Large Mixing
D. P. Roy
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 νμ and ντ but suppressed ones to νe. It can naturally account for the large (small) mixing solutions to the atmospheric (solar) neutrino oscillation data.
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