A dark matter model that reconciles tensions between the cosmic-ray e± excess and the gamma-ray and CMB constraints

doi:10.1016/j.physletb.2017.09.003

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	A dark matter model that reconciles tensions between the cosmic-ray e± excess and the gamma-ray and CMB constraints
	Yin PF(殷鹏飞); Xiang, Q.-F., X.-J. Bi, S.-J. Lin and P.-F. Yin; Xiang QF(向仟飞); Bi XJ(毕效军); Lin SJ(林苏杰)
刊名	PHYSICS LETTERS B
	2017
卷号	773 页码:448-454
ISSN号	0370-2693
DOI	10.1016/j.physletb.2017.09.003
文献子类	Article
英文摘要	The cosmic-ray (CR) e(+/-) excess observed by AMS-02 can be explained by dark matter (DM) annihilation. However, the DM explanation requires a large annihilation cross section which is strongly disfavored by other observations, such as the Fermi-LAT gamma-ray observation of dwarf galaxies and the Planck observation of the cosmic microwave background (CMB). Moreover, the DM annihilation cross section required by the CR e(sic) excess is also too large to generate the correct DM relic density with thermal production. In this work we use the Breit-Wigner mechanism with a velocity dependent DM annihilation cross section to reconcile these tensions. If DM particles accounting for the CR e +/- excess with v similar to O(10(-3)) are very close to a resonance in the physical pole case, their annihilation cross section in the Galaxy reaches a maximal value. On the other hand, the annihilation cross section would be suppressed for DM particles with smaller relative velocities in dwarf galaxies and at recombination, which may affect the gamma-ray and CMB observations, respectively. We find a proper parameter region that can simultaneously explain the AMS-02 results and the thermal relic density, while satisfying the Fermi-LAT and Planck constraints. (C) 2017 The Authors. Published by Elsevier B.V.
电子版国际标准刊号	1873-2445
WOS关键词	PROPAGATION ; ANISOTROPY ; COSMOLOGY
WOS研究方向	Astronomy & Astrophysics ; Physics
语种	英语
WOS记录号	WOS:000413294200068
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/284637]
专题	高能物理研究所_粒子天体物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Yin PF,Xiang, Q.-F., X.-J. Bi, S.-J. Lin and P.-F. Yin,Xiang QF,et al. A dark matter model that reconciles tensions between the cosmic-ray e± excess and the gamma-ray and CMB constraints[J]. PHYSICS LETTERS B,2017,773:448-454.
APA	殷鹏飞,Xiang, Q.-F., X.-J. Bi, S.-J. Lin and P.-F. Yin,向仟飞,毕效军,&林苏杰.(2017).A dark matter model that reconciles tensions between the cosmic-ray e± excess and the gamma-ray and CMB constraints.PHYSICS LETTERS B,773,448-454.
MLA	殷鹏飞,et al."A dark matter model that reconciles tensions between the cosmic-ray e± excess and the gamma-ray and CMB constraints".PHYSICS LETTERS B 773(2017):448-454.