Impact of Semi-annihilation of Z3 Symmetric Dark Matter with Radiative Neutrino Masses

TL;DR

This paper explores a Z3 symmetric dark matter model with radiative neutrino masses, highlighting the significance of semi-annihilation processes in achieving the observed relic density and discussing unique experimental signatures.

Contribution

It introduces a novel Z3 symmetric model incorporating semi-annihilation effects, which are crucial for accurate relic density calculations and differ from Z2 models.

Findings

Semi-annihilation significantly affects relic density calculations.

Dark matter signatures differ from Z2 symmetric models.

The model links neutrino masses with dark matter phenomenology.

Abstract

We investigate a Z3 symmetric model with two-loop radiative neutrino masses. Dark matter in the model is either a Dirac fermion or a complex scalar as a result of an unbroken Z3 symmetry. In addition to standard annihilation processes, semi-annihilation of the dark matter contributes to the relic density. We study the effect of the semi-annihilation in the model and and that those contributions are important to obtain the observed relic density. The experimental signatures in dark matter searches are also discussed, where some of them are expected to be different from the signatures of dark matter in Z2 symmetric models.