Observable Heavy Higgs Dark Matter

TL;DR

This paper proposes a model with two Inert Higgs Doublets to make heavy Higgs dark matter detectable via direct detection experiments and collider searches, overcoming previous limitations.

Contribution

Introducing a second Inert Higgs Doublet enhances the detectability of heavy Higgs dark matter by increasing couplings or lowering its mass, making it accessible to experiments.

Findings

Adding a second doublet increases DM coupling to the Higgs boson.

It allows heavy DM to have a lower mass around 360 GeV.

The model improves prospects for detection at DD experiments and the LHC.

Abstract

Dark Matter (DM), arising from an Inert Higgs Doublet, may either be light, below the $W$ mass, or heavy, above about 525 GeV. While the light region may soon be excluded, the heavy region is known to be very difficult to probe with either Direct Detection (DD) experiments or the Large Hadron Collider (LHC). We show that adding a second Inert Higgs Doublet helps to make the heavy DM region accessible to both DD and the LHC, by either increasing its couplings to the observed Higgs boson, or lowering its mass to $360 \gev \lesssim m_{DM}$, or both.