Galactic center excess by Higgs portal dark matter

[摘要] A Z2parity odd real scalar is a good candidate for dark matter in the present Universe. We consider models contain two Higgs doublet fields and one real scalar dark matter particle with mass in the range of 31-40 GeV and annihilating into a bb pair, or with about 10 GeV mass and annihilating into tau lepton pair. Those annihilation modes suitably explain 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 various future experiments.

[发布机构] Department of Physics and Astronomy, University of Alabama, Tuscaloosa; AL; 35487, United States^1;Department of Life Science and Technology, Hokkai-Gakuen University, Sapporo; 062-8605, Japan^2

[效力级别] 天文学 [学科分类] 天文学(综合)

[关键词] Dark matter;Dark matter particles;Dark matter searches;Galactic Center;Gamma-ray flux;Parameter regions;Tau lepton pairs