# Hunting the dark Higgs

## TL;DR

This paper proposes a new LHC search strategy for dark matter involving a dark Higgs boson, which produces distinctive large-radius jets with missing energy, expanding the reach beyond traditional methods.

## Contribution

It introduces a novel collider signature involving a dark Higgs boson decaying into Standard Model particles, enhancing detection prospects for dark matter models.

## Key findings

- LHC searches can effectively identify dark Higgs signatures.
- The proposed method probes parameter space beyond mono-jet and di-jet searches.
- Large-radius jets with missing energy are key discriminators.

## Abstract

We discuss a novel signature of dark matter production at the LHC resulting from the emission of an additional Higgs boson in the dark sector. The presence of such a dark Higgs boson is motivated simultaneously by the need to generate the masses of the particles in the dark sector and the possibility to relax constraints from the dark matter relic abundance by opening up a new annihilation channel. If the dark Higgs boson decays into Standard Model states via a small mixing with the Standard Model Higgs boson, one obtains characteristic large-radius jets in association with missing transverse momentum that can be used to efficiently discriminate signal from backgrounds. We present the sensitivities achievable in LHC searches for dark Higgs bosons with already collected data and demonstrate that such searches can probe large regions of parameter space that are inaccessible to conventional mono-jet or di-jet searches.