Phenomenology of the Hidden SU(2) Vector Dark Matter Model

TL;DR

This paper explores a non-abelian SU(2) gauge extension of the Standard Model with a scalar portal, identifying viable dark matter candidates and analyzing their phenomenology, including collider signatures and experimental constraints.

Contribution

It introduces a hidden SU(2) gauge sector with a scalar portal, providing a detailed phenomenological analysis of dark matter candidates and collider signals within this framework.

Findings

Viable dark matter mass range from GeV to TeV.

Scalar mixing affects Higgs coupling and di-Higgs production.

Model satisfies perturbativity, unitarity, and relic density constraints.

Abstract

We investigate the phenomenology of an extension of the Standard Model (SM) by a non-abelian gauge group $SU(2)_{HS}$ where all SM particles are singlets under this gauge group, and a new scalar representation $\phi$ that is singlet under SM gauge group and doublet under $SU(2)_{HS}$. In this model, the dark matter (DM) candidates are the three mass degenerate dark photons $A_{i}$ $(i=1,2,3)$ of $SU(2)_{HS}$; and the hidden sector interacts with the (SM) particles through the Higgs portal interactions. Consequently, there will be a new CP-even scalar $\eta$ that could be either heavier or lighter than the SM-like Higgs. By taking into account all theoretical and experimental constraints such as perturbativity, unitarity, vacuum stability, non-SM Higgs decays, DM direct detection, DM relic density, we found viable DM is possible in the range from GeV to TeV. Within the viable parameters space, the both of the triple Higgs coupling and the di-Higgs production at LHC14 could be enhanced or reduced depending on the scalar mixing and the mass of the scalar particle $\eta$.