Radiative neutrino mass model with degenerate right-handed neutrinos

Abstract

The radiative neutrino mass model can relate neutrino masses and dark matter at a TeV scale. If we apply this model to thermal leptogenesis, we need to consider resonant leptogenesis at that scale. It requires both finely degenerate masses for the right-handed neutrinos and a tiny neutrino Yukawa coupling. We propose an extension of the model with a U(1) gauge symmetry, in which these conditions are shown to be simultaneously realized through a TeV scale symmetry breaking. Moreover, this extension can bring about a small quartic scalar coupling between the Higgs doublet scalar and an inert doublet scalar which characterizes the radiative neutrino mass generation. It also is the origin of the $Z_2$ symmetry which guarantees the stability of dark matter. Several assumptions which are independently supposed in the original model are closely connected through this extension.

28 pages, 3 figures, accepted version for publication

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Cited by in corpus (7)

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• Dark matter stability and one-loop neutrino mass generation based on Peccei-Quinn symmetry
• Low scale leptogenesis in a hybrid model of the scotogenic type I and III seesaw
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• Possible roles of Peccei-Quinn symmetry in an effective low energy model
• Symmetry restoration due to preheating and lepton number asymmetry