Dark Matter from Unification of Color and Baryon Number

TL;DR

This paper explores a model where dark matter arises as a neutral partner of quarks in an extended gauge symmetry, predicting a heavy dark matter particle around 2-3 TeV with implications for collider and detection experiments.

Contribution

It introduces a novel SU(4) x SU(2)_L x U(1)_X model unifying color and baryon number, with a dark matter candidate linked to the top quark, and analyzes its phenomenology.

Findings

Dark matter candidate mass around 2-3 TeV consistent with relic density

Rich LHC phenomenology with top quark signatures

Potential for detection at future 100 TeV colliders

Abstract

We analyze a recently proposed extension of the Standard Model based on the SU(4) x SU(2)_L x U(1)_X gauge group, in which baryon number is interpreted as the fourth color and dark matter emerges as a neutral partner of the ordinary quarks under SU(4). We show that under well-motivated minimal flavor-violating assumptions the particle spectrum contains a heavy dark matter candidate which is dominantly the partner of the right-handed top quark. Assuming a standard cosmology, the correct thermal relic density through freeze-out is obtained for dark matter masses around 2 - 3 TeV. We examine the constraints and future prospects for direct and indirect searches for dark matter. We also briefly discuss the LHC phenomenology, which is rich in top quark signatures, and investigate the prospects for discovery at a 100 TeV hadron collider.