# Radiative neutrino model with semi-annihilation dark matter

## TL;DR

This paper introduces a two-loop radiative neutrino model with a hidden gauged U(1) symmetry, where semi-annihilation significantly influences dark matter relic density, aligning with neutrino and lepton flavor constraints.

## Contribution

It presents a novel two-loop radiative neutrino model incorporating semi-annihilation dark matter and explores its parameter space consistent with experimental bounds.

## Key findings

- Semi-annihilation is crucial for relic density.
- Allowed DM mass range is 80-400 GeV.
- Model satisfies neutrino oscillation and lepton flavor violation constraints.

## Abstract

We propose a Two-Loop induced radiative neutrino model with hidden gauged $U(1)$ symmetry, in which a dark matter of Dirac fermion arises. The relic density gets contribution from annihilation and semi-annihilation due to a residual $\mathbb{Z}_3$ parity. After imposing the requirement of neutrino oscillation data and lepton flavour violation bounds, we find out that the semi-annihilation plays a crucial role in order to satisfy the relic density constraint $0.117 < \Omega h^2 < 0.123$, by proceeding near either one of two deconstructive scalar resonances. Our numerical analysis demonstrates the allowed region for the DM-Scalar coupling with the DM mass in $(80, 400)$ GeV.