Chiral dark matter and radiative neutrino masses from gauged U(1) symmetry

TL;DR

This paper introduces a class of chiral U(1) gauge symmetry-based dark matter models that also generate neutrino masses radiatively, ensuring dark matter stability and compatibility with experimental constraints.

Contribution

It identifies 38 minimal chiral U(1) models derived from a chiral SU(3)×SU(2) symmetry and demonstrates their ability to produce radiative neutrino masses and viable dark matter candidates.

Findings

38 minimal chiral U(1) models identified

Models can generate small Majorana neutrino masses radiatively

Phenomenological analysis shows consistency with relic density and detection constraints

Abstract

We propose a class of dark matter models based on a chiral $U(1)$ gauge symmetry acting on a dark sector. The chiral $U(1)$ protects the masses of the dark sector fermions, and also guarantees the stability of the dark matter particle by virtue of an unbroken discrete $\mathcal{Z}_N$ gauge symmetry. We identify 38 such $U(1)$ models which are descendants of a chiral $SU(3) \times SU(2)$ gauge symmetry, consisting of a minimal set of fermions with simple $U(1)$ charge assignments. We show how these models can also be utilized to generate small Majorana neutrino masses radiatively via the scotogenic mechanism with the dark sector particles circulating inside loop diagrams. We further explore the phenomenology of the simplest model in this class, which admits a Majorana fermion, Dirac fermion or a scalar field to be the dark matter candidate, and show the consistency of various scenarios with constraints from relic density and direct detection experiments.