Abstract
We explore the Large Hadron Collider (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: $\ensuremath{\gamma}\ensuremath{\gamma}$, $b\overline{b}$, $Z{Z}^{*}\ensuremath{\rightarrow}4\ensuremath{\ell}$, and $\ensuremath{\ell}\ensuremath{\ell}jj$. We estimate the LHC sensitivities to a variety of new physics scenarios within the frameworks of both effective operators and simplified models. For all of these scenarios, the $\ensuremath{\gamma}\ensuremath{\gamma}$ channel provides the best sensitivity, whereas the $b\overline{b}$ channel suffers from a large $t\overline{t}$ background. Mono-Higgs is unlike other mono-$X$ searches ($X=\text{jet}$, 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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