A stable Higgs portal with vector dark matter

TL;DR

This paper proposes a model extending the Standard Model with an extra U(1) gauge symmetry and a scalar Higgs portal, providing a stable vector dark matter candidate consistent with experimental constraints and vacuum stability.

Contribution

It introduces a novel U(1) extension with a scalar portal that yields a stable vector dark matter candidate and ensures electroweak vacuum stability within certain parameters.

Findings

Vector dark matter satisfies relic abundance and direct detection limits.

Additional Higgs-like state compatible with collider bounds.

Electroweak vacuum stability achieved in parameter space.

Abstract

We explore an extension of the Standard Model by an additional U (1) gauge group and a complex scalar Higgs portal. As the scalar is charged under this gauge factor this simple model supplies a vector dark matter candidate satisfying the observed relic abundance and limits from direct dark matter searches. An additional Higgs-like state, that may be heavier or lighter than the observed Higgs, is present and satisfies LEP and LHC bounds whilst allowing for absolute stability of the electroweak vacuum in a range of parameter space.