Natural seesaw mechanism, eV-keV-MeV-type neutrino spectrum, and cosmology

Details Natural seesaw mechanism, eV-keV-MeV-type neutrino spectrum, and cosmology Natural seesaw mechanism, eV-keV-MeV-type neutrino spectrum, and cosmology

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988phrvd..38.2226m&link_type=abstract

Physical Review D (Particles and Fields), Volume 38, Issue 7, 1 October 1988, pp.2226-2230

Mathematics

Logic

12

Quark And Lepton Masses And Mixing, Particle-Theory And Field-Theory Models Of The Early Universe

Scientific paper

We show that in left-right-symmetric models one can have mve:mvμ:mvτ~=eV:KeV:MeV without any fine-tuning of parameters. The νμ and ντ decay via Majoron emission with lifetimes short enough to avoid cosmological constraints. The key ingredient of the model is the breaking of D parity, present in SO(10), at a scale much higher than the scale of SU(2)R breaking. Using the Fritzsch ansatz for up-quark mass matrices and a diagonal form for the heavy neutrino masses, we predict &<10 TeV, and &>=0.2 eV.

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