Higgs Portal Vector Dark Matter : Revisited

TL;DR

This paper revisits the Higgs portal vector dark matter model, showing it remains viable across a wide mass range due to a cancellation mechanism, and predicts suppressed Higgs signals testable at the LHC.

Contribution

The study introduces a renormalizable Higgs portal vector dark matter model with a hidden sector Higgs, demonstrating its viability and distinctive Higgs signal suppression.

Findings

Model evades XENON100 bounds via scalar cancellation

Remains viable for large dark matter mass range

Predicts universally suppressed Higgs signals at LHC

Abstract

We revisit the Higgs portal vector dark matter model including a hidden sector Higgs field that generates the mass of the vector dark matter. The model becomes renormalizable and has two scalar bosons, the mixtures of the standard model (SM) Higgs and the hidden sector Higgs bosons. The strong bound from direct detection such as XENON100 is evaded due to the cancellation mechanism between the contributions from two scalar bosons. As a result, the model becomes still viable in large range of dark matter mass, contrary to some claims in the literature. The Higgs properties are also affected, the signal strengths for the Higgs boson search being universally suppressed relative to the SM value, which could be tested at the LHC in the future.