Direct Detection of Dark Matter with Resonant Annihilation

被引：8
作者：
Li Bo [1 ]
Zhou Yu-Feng [1 ]
机构：
[1] Chinese Acad Sci, Inst Theoret Phys, Kavli Inst Theoret Phys China, State Key Lab Theoret Phys, Beijing 100190, Peoples R China
来源：
COMMUNICATIONS IN THEORETICAL PHYSICS | 2015年 / 64卷 / 01期
关键词：
resonant annihilation; relic density; neutrino background; DM direct detection experiments; ELECTROWEAK PHASE-TRANSITION; LEFT-RIGHT MODEL; STANDARD MODEL; HIGGS; SINGLET; ABUNDANCE;
D O I：
10.1088/0253-6102/64/1/119
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In the scenario where the dark matter (DM) particles chi(chi) over bar pair annihilate through a resonance particle R, the constraint from DM relic density makes the corresponding cross section for DM-nuclei elastic scattering extremely small, and can be below the neutrino background induced by the coherent neutrino-nuclei scattering, which makes the DM particle beyond the reach of the conventional DM direct detection experiments. We present an improved analytical calculation of the DM relic density in the case of resonant DM annihilation for s- and p-wave cases and invesitgate the condition for the DM-nuclei scattering cross section to be above the neutrino background. We show that in Higgs-portal type models, for DM particles with s-wave annihilation, the spin-independent DM-nucleus scattering cross section is proportional to Gamma(R)/m(R), the ratio of the decay width and the mass of R. For a typical DM particle mass similar to 50 GeV, the condition leads to Gamma(R)/m(R) greater than or similar to O(10(-4)). In p-wave annihilation case, the spin-independent scattering cross section is insensitive to Gamma(R)/m(R), and is always above the neutrino background, as long as the DM particle is lighter than the top quark. The real singlet DM model is discussed as a concrete example.
引用
收藏
页码：119 / 126
页数：8
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