Scale invariant radiative neutrino mass model

TL;DR

This paper introduces a scale invariant radiative neutrino mass model with custodial symmetry, explaining neutrino masses, dark matter, and baryon asymmetry through a singlet scalar VEV and resonant leptogenesis.

Contribution

It presents a novel scale invariant model where neutrino masses and dark matter are generated via a singlet scalar VEV, with specific phenomenological predictions.

Findings

Dark matter candidate is the lightest right-handed neutrino with mass less than 1 MeV.

Baryon asymmetry can be explained through resonant leptogenesis.

Model predicts a suppressed weak scale due to custodial symmetry.

Abstract

We propose a scale invariant radiative neutrino mass model with custodial symmetry. Masses of an inert doublet scalar and right-handed neutrinos are induced by a vacuum expectation value (VEV) of a singlet scalar caused through the Coleman-Weinberg mechanism. It violates spontaneously both the custodial symmetry and the scale invariance. The weak scale can take a suppressed value compared with the singlet scalar VEV because of the custodial symmetry. In this framework we study phenomenological consequences for neutrino mass, dark matter and baryon number asymmetry. Since the required dark matter abundance cannot be explained by a neutral component of the inert doublet scalar, the lightest right-handed neutrino should be dark matter. Mass of the dark matter is predicted to be less than $O(1)$ MeV and baryon number asymmetry could be explained through resonant leptogenesis.