Small Dirac neutrino masses and fast decay of the 17 keV neutrino
Journal
Physics Letters B
Journal Volume
261
Journal Issue
4
Pages
486-490
Date Issued
1991
Author(s)
Abstract
We construct an invisible axion model which naturally explains the smallness of Dirac neutrino masses by generating the neutrino masses at the two-loop level. This model also provides a qualitative explanation for the fermion mass hierarchy mt ≫ mb, mτ ≫ mν. The implications of a possible 17 keV neutrino are discussed. In particular a 17 keV heavy neutrino can have a cosmologically safe fast decay through νheavy → νlight + axion. © 1991.
Type
journal article