Vector Dark Matter from the 5-Dimensional Representation of $SU(2)_{L}$

TL;DR

This paper explores a new spin-1 dark matter candidate within the minimal dark matter framework, analyzing its theoretical consistency, relic abundance, detection prospects, and collider signatures, especially for masses around tens of TeV.

Contribution

It extends minimal dark matter models to include a spin-1 particle in the 5-dimensional $SU(2)_L$ representation, addressing unitarity and detection implications.

Findings

Model remains consistent with experimental constraints.

Dark matter masses around dozens of TeV are viable.

Potential detection via gamma-ray observatories like CTA.

Abstract

The introduction of electroweak multiplets that transform under any representation of the standard $SU(2)_L$ gauge group suggests the existence of electrically neutral stable particles capable of serving as cold dark matter in the $\Lambda$CDM cosmological model. This paradigm, known as minimal dark matter, has primarily focused on spin-$0$ and spin-$1/2$ particles. We extend this study to the spin-1 case using the 5-dimensional real representation. We address unitarity concerns arising from the model's interactions with electroweak and Higgs fields of the Standard Model, investigating implications for dark matter relic density, direct and indirect detection, including non-perturbative Sommerfeld enhancement for the latter. Collider signatures of the proposed model are also examined. Our findings suggest that the model remains consistent with experimental constraints, particularly for dark matter masses on the order of dozens of TeV, and could potentially be tested using $\gamma$-ray observatories such as CTA.