Comprehensive Phenomenology of the Dirac Scotogenic Model: Novel Low Mass Dark Matter

TL;DR

This paper thoroughly explores a Dirac Scotogenic model that generates small neutrino masses and predicts low-mass dark matter candidates, analyzing its phenomenological implications and stability constraints.

Contribution

It provides a comprehensive phenomenological analysis of a Dirac Scotogenic model with a novel low-mass dark matter candidate protected by a discrete symmetry.

Findings

Model allows for low-mass scalar and fermionic dark matter candidates.

Electroweak vacuum stability is compatible with the model.

Charged lepton flavor violation constraints are satisfied.

Abstract

The Dirac Scotogenic model provides an elegant mechanism for generating small Dirac neutrino masses at the one-loop level. A single abelian discrete $Z_{6}$ symmetry simultaneously protects the ``Diracness'' of the neutrinos and the stability of the dark matter candidate. This symmetry originates as an unbroken subgroup of the so-called 445 $U(1)_{B-L}$ symmetry. Here, we thoroughly explore the phenomenological implications of this construction, including an analysis of electroweak vacuum stability, charged lepton flavor violation, and the dark matter phenomenology. After considering all constraints, we also show that the model allows for the possibility of novel low-mass scalar and fermionic dark matter, a feature not shared by its canonical Majorana counterpart.