Nonabelian Dark Matter with Resonant Annihilation

TL;DR

This paper proposes a new nonabelian gauge symmetry model for dark matter, featuring resonant annihilation mechanisms, and explores its experimental detectability through collider and direct detection experiments.

Contribution

The paper introduces a novel SU(2)_X x U(1)_{B-L} gauge symmetry model with a natural dark matter stabilization and resonant annihilation, expanding beyond previous models.

Findings

Identifies parameter regions consistent with relic density and collider constraints.

Predicts detectable signals in future dark matter direct detection experiments.

Suggests potential signatures at the LHC for new gauge bosons.

Abstract

We construct a model based on an extra gauge symmetry, SU(2)_X x U(1)_{B-L}, which can provide gauge bosons to serve as weakly-interacting massive particle dark matter. The stability of the dark matter is naturally guaranteed by a discrete Z_2 symmetry that is a subgroup of SU(2)_X. The dark matter interacts with standard model fermions by exchanging gauge bosons which are linear combinations of SU(2)_X x U(1)_{B-L} gauge bosons. With the appropriate choice of representation for the new scalar multiplet whose vacuum expectation value spontaneously breaks the SU(2)_X symmetry, the relation between the new gauge boson masses can naturally lead to resonant pair annihilation of the dark matter. After exploring the parameter space of the new gauge couplings subject to constraints from collider data and the observed relic density, we use the results to evaluate the cross section of the dark matter scattering off nucleons and compare it with data from the latest direct detection experiments. We find allowed parameter regions that can be probed by future direct searches for dark matter and LHC searches for new particles.