Radiative Neutrino Mass & Majorana Dark Matter within an Inert Higgs Doublet Model

TL;DR

This paper proposes an extension of the Standard Model with an inert Higgs doublet and Majorana fermions to explain neutrino masses and dark matter, compatible with experimental constraints and featuring testable collider signatures.

Contribution

It introduces a novel model combining inert Higgs doublet and Majorana fermions to simultaneously address neutrino mass origin and dark matter, with detailed phenomenological analysis.

Findings

Neutrino masses generated at one-loop level in the model.

Dark matter candidate identified as the lightest Majorana fermion.

Model remains consistent with experimental constraints.

Abstract

We consider an extension of the standard model (SM) with an inert Higgs doublet and three Majorana singlet fermions to address both origin and the smallness of neutrino masses and dark matter (DM) problems. In this setup, the lightest Majorana singlet fermion plays the role of DM candidate and the model parameter space can be accommodated to avoid different experimental constraints such as lepton flavor violating processes and electroweak precision tests. The neutrino mass is generated at one-loop level a la Scotogenic model and its smallness is ensured by the degeneracy between the CP-odd and CP-even scalar members of the inert doublet. Interesting signatures at both leptonic and hadronic colliders are discussed.