Galactic Center gamma-ray excess from two-Higgs-doublet-portal dark matter

Abstract

We consider a simple extension of the type-II two-Higgs-doublet model by introducing a real scalar as a candidate for dark matter in the present Universe. The main annihilation mode of the dark matter particle with a mass of around $31-40$ GeV is into a $b\bar{b}$ pair, and this annihilation mode suitably explains the observed excess of the gamma-ray flux from the Galactic Center. We identify the parameter region of the model that can fit the gamma-ray excess and satisfy phenomenological constraints, such as the observed dark matter relic density and the null results of direct dark matter search experiments. Most of the parameter region is found to be within the search reach of future direct dark matter detection experiments.

11 pages, 11 figures, references added, matched with the final journal version

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Cited by in corpus (11)

• A Tale of Tails: Dark Matter Interpretations of the Fermi GeV Excess in Light of Background Model Systematics
• WIMPs at the Galactic Center
• Nonthermal Two Component Dark Matter Model for Fermi-LAT $\gamma$-ray excess and 3.55 keV X-ray Line
• Towards a Supersymmetric Description of the Fermi Galactic Center Excess
• Annihilating Asymmetric Dark Matter
• The Semi-Hooperon: Gamma-ray and anti-proton excesses in the Galactic Center
• NMSSM explanations of the Galactic center gamma ray excess and promising LHC searches
• $SU(2{)}_X$ Vector DM and Galactic Center Gamma-Ray Excess
• Non-abelian Dark Matter Solutions for Galactic Gamma-ray Excess and Perseus 3.5 keV X-ray Line
• Interpreting the galactic center gamma-ray excess in the NMSSM
• Vector Dark Matter in a $U(1{)}_X$ extended 2HDM