A U(1) gauge model with six chiral singlet fermions produces naturally small Dirac neutrino masses plus smaller Majorana masses, giving a quasi-Dirac spectrum and a TeV-scale new boson.
A chiral model for sterile neutrino
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abstract
A model, which extends the standard model with a new chiral U(1)$'$ gauge symmetry sector, for the eV-mass sterile neutrino is constructed. It is basically fixed by anomaly free conditions. The lightness of the sterile neutrino has a natural explanation. As a by product, this model provides a WIMP-like dark matter candidate.
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A Gauge Model for Quasi-Dirac Neutrinos
A U(1) gauge model with six chiral singlet fermions produces naturally small Dirac neutrino masses plus smaller Majorana masses, giving a quasi-Dirac spectrum and a TeV-scale new boson.