Dark matter annihilation through a lepton-specific Higgs boson
arXiv:1010.4214 · doi:10.1103/PhysRevD.83.035022
Abstract
It was recently argued by Hooper and Goodenough [arXiv:1010.2752] that the excess gamma ray emission from within 1-2 degrees of the galactic center can be well-described by annihilation of ~8 GeV dark matter particles into tau pairs. I show that such a dark matter signal can be obtained naturally in the lepton-specific two-Higgs-doublet model extended by a stable singlet scalar dark matter candidate. The favored parameter region prefers a light Higgs state (below 200 GeV) with enhanced couplings to leptons and sizable invisible branching fraction. Part of the favored region leads to invisible decays of both of the CP-even neutral Higgs states.
15 pages, no figures. V2: references added, fine-tuning discussion improved, submitted to PRD. V3: added Sec. 6 on direct detection prospects and associated refs, version accepted by PRD
References in corpus (7)
- Models of Yukawa interaction in the two Higgs doublet model, and their collider phenomenology
- Neutrino mass, Dark Matter and Baryon Asymmetry via TeV-Scale Physics without Fine-Tuning
- Lepton-Specific Two-Higgs Doublet Model: Experimental Constraints and Implication on Higgs Phenomenology
- The LHC Discovery Potential of a Leptophilic Higgs
- The Leptonic Higgs as a Messenger of Dark Matter
- Charged Higgs phenomenology in the lepton-specific two Higgs doublet model
- Light Higgs Boson, Light Dark Matter and Gamma Rays