Simplified Dark Matter Models Confront the Gamma Ray Excess

Abstract

Inspired by the excess of gamma rays from the Galactic Center, we confront a number of simplified dark matter models with experimental data. Assuming a single dark matter particle coupled to standard matter via a spin-0 mediator, we compare model evidences for Majorana fermion, real scalar and real vector dark matter candidates. We consider dark matter annihilation into various fermionic final states contributing to the observed differential gamma ray flux. Our likelihood function also includes the dark matter relic density, its elastic scattering cross section with nuclei, and collider limits. Using Bayesian inference we confine the mass and couplings strengths of the dark matter and mediator particle. Our results show that, if the gamma ray excess is due to dark matter the above parameters are well constrained by the observations. We find that the Majorana fermion dark matter model is supported the most by the data.

23 pages, 7 figures, 2 tables. Version to appear in Physical Review D

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• Scalar Simplified Models for Dark Matter
• WIMPs at the Galactic Center
• Dark Matter from a Classically Scale-Invariant $SU(3{)}_X$
• Galactic center $\gamma$-ray excess in hidden sector DM models with dark gauge symmetries: local $Z_3$ symmetry as an example
• NMSSM explanations of the Galactic center gamma ray excess and promising LHC searches
• The Semi-Hooperon: Gamma-ray and anti-proton excesses in the Galactic Center
• $SU(2{)}_X$ Vector DM and Galactic Center Gamma-Ray Excess
• Testing Type II Radiative Seesaw Model: from Dark Matter Detection to LHC Signatures
• Dark matter properties implied by gamma ray interstellar emission models