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Radiative type-I seesaw neutrino masses
Journal
Physical Review D
Date Issued
2019-12-09
Abstract
We discuss a radiative type-I seesaw. In these models, the radiative generation of Dirac neutrino masses
allows to explain the smallness of the observed neutrino mass scale for rather light right-handed neutrino
masses in a type-I seesaw. We first present the general idea in a model-independent way. This allows us to
estimate the typical scale of right-handed neutrino mass as a function of the number of loops. We then
present two example models, at the one- and two-loop level, which we use to discuss neutrino masses and
lepton-flavor-violating constraints in more detail. For the two-loop example, right-handed neutrino masses
must lie below 100 GeV, thus making this class of models testable in heavy neutral lepton searches.
allows to explain the smallness of the observed neutrino mass scale for rather light right-handed neutrino
masses in a type-I seesaw. We first present the general idea in a model-independent way. This allows us to
estimate the typical scale of right-handed neutrino mass as a function of the number of loops. We then
present two example models, at the one- and two-loop level, which we use to discuss neutrino masses and
lepton-flavor-violating constraints in more detail. For the two-loop example, right-handed neutrino masses
must lie below 100 GeV, thus making this class of models testable in heavy neutral lepton searches.
Subjects
