A potentially detectable gamma-ray line in the Fermi Galactic center excess - in light of one-step cascade annihilations of secluded (vector) dark matter via the Higgs portal

被引：5
作者：
Yang, Kwei-Chou [1 ,2 ]
机构：
[1] Chung Yuan Christian Univ, Dept Phys, 200 Chung Pei Rd, Taoyuan 32023, Taiwan
[2] Chung Yuan Christian Univ, Ctr High Energy Phys, 200 Chung Pei Rd, Taoyuan 32023, Taiwan
来源：
JOURNAL OF HIGH ENERGY PHYSICS | 2020年 / 2020卷 / 07期
关键词：
Cosmology of Theories beyond the SM; Beyond Standard Model; Higgs Physics; ELECTROWEAK SYMMETRY-BREAKING; ANATOMY;
D O I：
10.1007/JHEP07(2020)148
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We show the presence of a potentially detectable gamma-ray line in the Fermi Galactic center excess in light of the secluded (vector) dark matter (DM) model in which the hidden scalar, nearly degenerate with DM in mass, mediates the interaction of the secluded DM with the Standard Model (SM) due to its mixing with the SM Higgs. We find that the parameter region m(X) is an element of [60,132] GeV can provide a good fit to the Fermi Galactic center gamma-ray excess spectrum, appearing a prominent gamma-ray line with the energy is an element of [30,66] GeV. The best fit gives m(X) similar or equal to m(S) similar or equal to 86 GeV with a p-value = 0.42, so that the resultant gamma-ray line, arising from the decay of the scalar mediator into gamma gamma, peaks at 43 GeV. We derive constraints on the annihilation cross section from the Fermi-LAT gamma-ray line search, gamma-ray observations of the Fermi-LAT dwarf spheroidal galaxies, and Planck cosmic microwave background measurement. For the secluded vector DM model, the parameter space constrained by the current XENON1T and future LUX-ZEPLIN is shown. Finally, for the mixing angle between the Higgs sectors, we discuss its lower bound, which is required by the big bang nucleosynthesis constraint and relevant to the hidden sector decoupling temperature.
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页数：36
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