Leptogenesis and dark matter unified in a non-SUSY model for neutrino masses

TL;DR

This paper presents a non-supersymmetric model that simultaneously explains the origins of dark matter and baryon asymmetry through neutrino mass mechanisms, leptogenesis, and a new symmetry structure.

Contribution

It introduces a unified non-SUSY framework combining neutrino mass generation, dark matter stability, and baryon asymmetry via leptogenesis, with a novel symmetry breaking scheme.

Findings

Identifies two dark matter candidates stabilized by a new Z2 symmetry.

Demonstrates leptogenesis from heavy right-handed neutrino decay.

Shows compatibility of neutrino masses with observed data.

Abstract

We propose a unified explanation for the origin of dark matter and baryon number asymmetry on the basis of a non-supersymmetric model for neutrino masses. Neutrino masses are generated in two distinct ways, that is, a tree-level seesaw mechanism with a single right-handed neutrino, and one-loop radiative effects by a new additional doublet scalar. A spontaneously broken U(1)$^\prime$ brings a $Z_2$ symmetry which restricts couplings of this new scalar and controls the neutrino masses. It also guarantees the stability of a CDM candidate. We examine two possible candidate for the CDM. We also show that the decay of a heavy right-handed neutrino related to the seesaw mechanism can generate baryon number asymmetry through leptogenesis.