VDM: A model for Vector Dark Matter

TL;DR

This paper introduces a new vector dark matter model based on a $U(1)_X$ gauge symmetry and a $Z_2$ symmetry, exploring its phenomenology and detection prospects.

Contribution

It presents a novel vector dark matter model with extended scalar sectors and analyzes its rich phenomenology and potential for collider and direct detection experiments.

Findings

The model predicts a stable vector boson as a dark matter candidate.

Extended scalar sectors lead to phases with spontaneous CP violation or stable scalars.

The model's discovery potential is evaluated through collider and dark matter search analyses.

Abstract

We construct a model based on a new $U(1)_X$ gauge symmetry and a discrete $Z_2$ symmetry under which the new gauge boson is odd. The model contains new complex scalars which carry $U(1)_X$ charge but are singlets of the Standard Model. The $U(1)_X$ symmetry is spontaneously broken but the $Z_2$ symmetry is maintained, making the new gauge boson a dark matter candidate. In the minimal version there is only one complex scalar field but by extending the number of scalars to two, the model will enjoy rich phenomenology which comes in various phases. In one phase, CP is spontaneously broken. In the other phase, an accidental $Z_2$ symmetry appears which makes one of the scalars stable and therefore a dark matter candidate along with the vector boson. We discuss the discovery potential of the model by colliders as well as the direct dark matter searches.