Sub-TeV Quintuplet Minimal Dark Matter with Left-Right Symmetry

TL;DR

This paper explores a minimal fermionic quintuplet dark matter model within a left-right symmetric framework, introducing a singlet scalar to satisfy relic density constraints and analyzing its collider phenomenology at the LHC.

Contribution

It proposes a novel extension with a singlet scalar to enable sub-TeV dark matter masses and studies its collider signatures and relic density constraints.

Findings

The singlet scalar allows sub-TeV dark matter masses.

LHC phenomenology shows potential for di-Higgs and diphoton signals.

Model constraints are consistent with ATLAS bounds.

Abstract

A detailed study of a fermionic quintuplet dark matter in a left-right symmetric scenario is performed in this article. The minimal quintuplet dark matter model is highly constrained from the WMAP dark matter relic density (RD) data. To elevate this constraint, an extra singlet scalar is introduced. It introduces a host of new annihilation and co-annihilation channels for the dark matter, allowing even sub-TeV masses. The phenomenology of this singlet scalar is studied in detail in the context of the Large Hadron Collider (LHC) experiment. The production and decay of this singlet scalar at the LHC give rise to interesting resonant di-Higgs or diphoton final states. We also constrain the RD allowed parameter space of this model in light of the ATLAS bounds on the resonant di-Higgs and diphoton cross-sections.