A Minimal See-Saw Model for Hierarchical Neutrino Masses with Large Mixing

Details A Minimal See-Saw Model for Hierarchical Neutrino Masses with Large Mixing A Minimal See-Saw Model for Hierarchical Neutrino Masses with Large Mixing

1999-08-05

arxiv.org/abs/hep-ph/9908262v1

Nucl.Phys.Proc.Suppl. 85 (2000) 183-186

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, Latex, Invited Talk at the 6th San Miniato Topical Seminar on `Neutrino and Astroparticle Physics', to appear in Nucl

Scientific paper

10.1016/S0920-5632(00)00504-1

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 $\nu_\mu$ and $\nu_\tau$ but suppressed ones to $\nu_e$. It can naturally account for the large (small) mixing solutions to the atmospheric (solar) neutrino oscillation data.

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