Dark Matter in Leptophilic Higgs Models After the LHC Run-I

Abstract

We examine the leptophilic two Higgs doublet model with fermionic dark matter, considering the range of experimental constraints on the Higgs sector. The measurements of the 125 GeV Higgs from the LHC Run-I allow us to focus on those remaining processes that may play an important role at colliders. We find that the leptophilic model allows for a much lighter Higgs than in other two-Higgs models, although discovery at the LHC will be difficult. Adding a dark matter sector motivated by supersymmetric extensions of the leptophilic model, we find the existing parameter space can accommodate constraints from direct detection and the invisible widths of the Higgs and $Z$, while also fitting the Galactic Center gamma ray excess reported by analyses of Fermi-LAT data. We also discuss the status of the fully supersymmetric version of such models, which include four Higgs doublets and a natural dark matter candidate.

17 pages, 8 figures

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• Model-independent analysis of the DAMPE excess
• The Pursuit of Dark Matter at Colliders - An Overview
• Radiative Neutrino Mass with $Z_3$ Dark matter: From Relic Density to LHC Signatures
• Exploring Four Fermion Contact Couplings of a Dark Fermion and an Electron at Hadron Colliders and Direct Detection Experiments
• Two-photon exchange in leptophilic dark matter scenarios