Probing the Dark Matter of Three-loop Radiative Neutrino Mass Generation Model with the Cherenkov Telescope Array

TL;DR

This paper explores the potential for the Cherenkov Telescope Array to detect dark matter candidates arising from a three-loop radiative neutrino mass model extended with large electroweak multiplets, focusing on gamma-ray signatures from annihilation.

Contribution

It demonstrates that large electroweak multiplets enhance dark matter annihilation signals, making them observable with CTA, and constrains model parameters using unitarity and Landau pole considerations.

Findings

CTA can potentially detect gamma-ray signals from DM annihilation in this model.

Large electroweak multiplets lead to Sommerfeld-enhanced annihilation signatures.

Model parameters are constrained by unitarity and Landau pole limits.

Abstract

We investigate the prospect of detecting the Dark Matter (DM) candidate in the three-loop radiative neutrino mass generation model extended with large electroweak multiplets of the Standard Model (SM) gauge group, at the future imaging atmospheric Cherenkov telescope known as the Cherenkov Telescope Array (CTA). We find that the addition of such large electroweak multiplets leads to a sizable Sommerfeld enhanced annihilation of the DM with $O(\text{TeV})$ mass, into the SM gauge bosons which results in continuum and line-like spectra of very high energy (VHE) gamma-rays, and therefore becomes observable for the CTA. We determine the viable models by setting the upper limit on the $SU(2)_{L}$ isospin of the multiplets from the partial-wave unitarity constraints and the appearance of low-scale Landau pole in the gauge coupling. Afterwards, by considering the continuum VHE gamma-rays produced from the DM annihilation at the Galactic center, we probe the parameter space of the model using the sensitivity reach of the CTA.