Mono-Higgs signature in fermionic dark matter model

Abstract

In light of the Higgs boson discovery, we explore mono-Higgs signature in association with dark matter pair production at the LHC in a renormalizable model with a fermionic dark matter candidate. For two channels with $\gamma \gamma +\text{MET}$ and $b\bar{b}+\text{MET}$ in the final state we simulate the SM backgrounds and signal events at $\sqrt{s}=14$ TeV. We then estimate the LHC sensitivities for various benchmark points for two integrated luminosities $\mathcal{L}=300{\text{fb}}^{-1}$ and $\mathcal{L}=3{\text{ab}}^{-1}$. We constrain the Yukawa coupling of the dark matter-SM interaction, taking into account bounds from mono-Higgs signature, observed dark matter relic density, Higgs physics, perturbativity requirement and electroweak measurements. Concerning the mono-Higgs search, it turns out that the channel with the largest branching ratio, $b\bar{b}$ channel, provides better sensitivity. There are found regions in the parameter space of the model compatible with all the bounds mentioned above which can be reached in future LHC studies.

23 pages, clarifications added, journal version

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