A minimal model for ${\rm SU}(N)$ vector dark matter

TL;DR

This paper proposes a minimal extension of the Standard Model with a hidden SU(N) gauge sector, where a new scalar induces dynamical symmetry breaking and provides a stable dark matter candidate, analyzed for N=2,3,4.

Contribution

It introduces a classically conformal SU(N) vector dark matter model with a Higgs portal and explores its phenomenology for N=2,3,4, identifying viable parameter regions.

Findings

N=2,3 models are consistent with current collider and dark matter constraints.

A heavy Higgs boson is expected to be discovered at LHC Run II.

The N=3 model may be ruled out by future experiments.

Abstract

We study an extension of the Standard Model featuring a hidden sector that consists of a new scalar charged under a new SU$(N)_D$ gauge group, singlet under all Standard Model gauge interactions, and coupled with the Standard Model only via a Higgs portal. We assume that the theory is classically conformal, with electroweak symmetry breaking dynamically induced via the Coleman-Weinberg mechanism operating in the hidden sector. Due to the symmetry breaking pattern, the SU$(N)_D$ gauge group is completely Higgsed and the resulting massive vectors of the hidden sector constitute a stable dark matter candidate. We perform a thorough scan over the parameter space of the model at different values of $N=2$, $3$, and $4$, and investigate the phenomenological constraints. We find that $N=2,3$ provide the most appealing model setting in light of present data from colliders and dark matter direct search experiments. We expect a heavy Higgs to be discovered at LHC by the end of Run II or the $N=3$ model to be ruled out.