Extending two Higgs doublet models for two-loop neutrino mass generation and one-loop neutrinoless double beta decay

Abstract

We extend some two Higgs doublet models, where the Yukawa couplings for the charged fermion mass generation only involve one Higgs doublet, by two singlet scalars respectively carrying a singly electric charge and a doubly electric charge. The doublet and singlet scalars together can mediate a two-loop diagram to generate a tiny Majorana mass matrix of the standard model neutrinos. Remarkably, the structure of the neutrino mass matrix is fully determined by the symmetric Yukawa couplings of the doubly charged scalar to the right-handed leptons. Meanwhile, a one-loop induced neutrinoless double beta decay can arrive at a testable level even if the electron neutrino has an extremely small Majorana mass. We also study other experimental constraints and implications including some rare processes and Higgs phenomenology.

15 pages, 6 figures, references are added

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Cited by in corpus (3)

• From the trees to the forest: a review of radiative neutrino mass models
• A Two Higgs Doublet Model for Dark Matter and Neutrino Masses
• Two-loop Induced Majorana Neutrino Mass in a Radiatively Induced Quark and Lepton Mass Model