Indirect detection imprint of a CP violating dark sector

被引:6
作者
Chao, Wei [1 ]
Ramsey-Musolf, Michael J. [1 ,2 ]
Yu, Jiang-Hao [1 ]
机构
[1] Univ Massachusetts, Dept Phys, Amherst Ctr Fundamental Interact, Amherst, MA 01003 USA
[2] CALTECH, Kellogg Radiat Lab, Pasadena, CA 91125 USA
关键词
HIGGS; MATTER; BOSON;
D O I
10.1103/PhysRevD.93.095025
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We introduce a simple scenario involving fermionic dark matter (chi) and singlet scalar mediators that may account for the Galactic center GeV gamma-ray excess while satisfying present direct detection constraints. CP violation in the scalar potential leads to a mixing between the Standard Model Higgs boson and the scalar singlet, resulting in three scalars, h(1,2,3), of indefinite CP-transformation properties. This mixing enables s-wave chi(chi) over bar annihilation into discalar states, followed by decays into four-fermion final states. The observed gamma-ray spectrum can be fitted while respecting present direct detection bounds and Higgs boson properties for m(chi) = 60 similar to 80 GeV, and m(h3) similar to m(chi). Searches for the Higgs exotic decay channel h(1) -> h(3)h(3) at the 14 TeV LHC should be able to further probe the parameter region favored by the gamma-ray excess.
引用
收藏
页数:14
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