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
	Xiang QF(向仟飞); Bi XJ(毕效军); Lin SJ(林苏杰); Yin PF(殷鹏飞); Xiang, Q.-F., X.-J. Bi, S.-J. Lin and P.-F. Yin
	2017
发表期刊	PHYSICS LETTERS B (IF:4.807[JCR-2016],4.327[5-Year])
ISSN	0370-2693
EISSN	1873-2445
卷号	773 页码:448-454
文章类型	Article
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.
DOI	10.1016/j.physletb.2017.09.003
关键词[WOS]	PROPAGATION ; ANISOTROPY ; COSMOLOGY
收录类别	SCI ; SCOPUS ; ADS ; INSPIREHEP
语种	英语
WOS研究方向	Astronomy & Astrophysics ; Physics
WOS类目	Astronomy & Astrophysics ; Physics, Nuclear ; Physics, Particles & Fields
WOS记录号	WOS:000413294200068
ADS Bibcode	2017PhLB..773..448X
ADS URL	https://ui.adsabs.harvard.edu/abs/2017PhLB..773..448X
ADS引文	https://ui.adsabs.harvard.edu/abs/2017PhLB..773..448X/citations
AXRIV号	177
INSPIRE ID	1613497
INSPIRE URL	https://inspirehep.net/record/1613497
引用统计	正在获取... 被引频次：19 [ADS]
文献类型	期刊论文
条目标识符	https://ir.ihep.ac.cn/handle/311005/284637
专题	粒子天体物理中心
作者单位	中国科学院高能物理研究所
第一作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Xiang QF,Bi XJ,Lin SJ,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	向仟飞,毕效军,林苏杰,殷鹏飞,&Xiang, Q.-F., X.-J. Bi, S.-J. Lin and P.-F. Yin.(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	向仟飞,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.