Higgs-Portal Spin-1 Dark Matter with Parity-Violating Interaction

TL;DR

This paper proposes a new spin-1 dark matter model with parity-violating interactions via a Higgs portal, which can satisfy relic density and direct detection constraints.

Contribution

It introduces a novel parity-violating Higgs portal operator for spin-1 dark matter, evading direct detection limits and explaining relic density.

Findings

Dark matter candidate around 400 GeV mass consistent with relic density

Parity-odd operator avoids direct detection constraints

Model remains viable with 1 TeV cutoff scale

Abstract

We introduce the spin-1 $U(1)_X$ gauged field $X$ with $Z_2$ odd dark parity to evade the current strong constraints on kinetic mixing. Then, $X$ becomes stable and a candidate for the dark matter. The lowest mass dimension of interaction is six, and the type is the Higgs portal. Two types of dim-6 operators are introduced. We consider the freeze-out dark matter scenario. With the limit of null momentum transfer, a parity odd operator is free from the direct detection constraints. Accordingly, the strong constraints on a parity even operator indicate turning on this parity odd operator to realize the dark matter relic density of the Universe. With the 1 TeV cut-off scale, our dark matter of around 400 GeV mass can explain the dark matter relic density and is allowed from the LUX-ZEPLIN experiment of the direct detection.