Scalar Dark Matter, GUT baryogenesis and Radiative neutrino mass

TL;DR

This paper explores a scotogenic model linking dark matter, neutrino mass generation, and GUT baryogenesis, showing how the model's particles and interactions can explain the matter-antimatter asymmetry and neutrino masses.

Contribution

It introduces a novel connection between dark matter, neutrino masses, and GUT baryogenesis within a scotogenic framework, highlighting the role of a $Z_2$-odd Higgs doublet.

Findings

Dark matter candidate is the lightest $Z_2$-odd particle.

Lepton asymmetry is converted into dark matter asymmetry.

The model can generate neutrino masses radiatively.

Abstract

We investigate an interesting correlation among dark matter phenomenology, neutrino mass generation and GUT baryogenesis, based on the scotogenic model. The model contains additional right-handed neutrinos $N$ and a second Higgs doublet $\Phi$, both of which are odd under an imposed $Z_2$ symmetry. The neutral component of $\Phi$, i.e. the lightest of the $Z_2$-odd particles, is the dark matter candidate. Due to a Yukawa coupling involving $\Phi$, $N$ and the Standard Model leptons, the lepton asymmetry is converted into the dark matter asymmetry so that a non-vanishing $B-L$ asymmetry can arise from $(B-L)$-conserving GUT baryogenesis, leading to a nonzero baryon asymmetry after the sphalerons decouple. On the other hand, $\Phi$ can also generate neutrino masses radiatively. In other words, the existence of $\Phi$ as the dark matter candidate resuscitates GUT baryogenesis and realizes neutrino masses.