Mono-Higgs: a new collider probe of dark matter

Abstract

We explore the LHC phenomenology of dark matter (DM) pair production in association with a 125 GeV Higgs boson. This signature, dubbed `mono-Higgs,' appears as a single Higgs boson plus missing energy from DM particles escaping the detector. We perform an LHC background study for mono-Higgs signals at $\sqrt{s}=8$ and $14$ TeV for four Higgs boson decay channels: $\gamma \gamma$, $b\bar{b}$, and $Z{Z}^{\ast }\to 4\ell$, $\ell \ell jj$. We estimate the LHC sensitivities to a variety of new physics scenarios within the frameworks of both effective operators and simplified models. For all these scenarios, the $\gamma \gamma$ channel provides the best sensitivity, whereas the $b\bar{b}$ channel suffers from a large $t\bar{t}$ background. Mono-Higgs is unlike other mono-$X$ searches ($X$=jet, photon, etc.), since the Higgs boson is unlikely to be radiated as initial state radiation, and therefore probes the underlying DM vertex directly.

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