Imprint of multicomponent dark matter on AMS-02

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	Imprint of multicomponent dark matter on AMS-02
	Geng, CQ; Huang, D; Tsai, LH
刊名	PHYSICAL REVIEW D
	2014
卷号	89 期号:5 页码:55021
关键词	COSMIC-RAY ELECTRONS GAMMA-RAY POSITRON FRACTION PAMELA EXCESS PROPAGATION ENERGIES MODELS BOUNDS MASS
ISSN号	1550-7998
通讯作者	Geng, CQ (reprint author), Natl Tsing Hua Univ, Dept Phys, Hsinchu, Taiwan.
英文摘要	The multicomponent decaying dark matter (DM) scenario is investigated to explain the possible excesses in the positron fraction by PAMELA and recently confirmed by AMS-02, and in the total e(+) + e(-) flux observed by Fermi-LAT. By performing the chi(2) fits, we find that two DM components are already enough to give a reasonable fit of both AMS-02 and Fermi-LAT data. The best-fitted results show that the heavier DM component with its mass of 1.5 TeV dominantly decays through the mu channel, while the lighter one of 100 GeV decays mainly through the tau channel. As a by-product, the fine structure around 100 GeV observed by AMS-02 and Fermi-LAT can be naturally explained by the dropping due to the lighter DM component. With the obtained model parameters by the fitting, we calculate the diffuse gamma-ray emission spectrum in this two-component DM scenario, and find that it is consistent with the data measured by Fermi-LAT. We also construct a microscopic particle DM model to naturally realize the two-component DM scenario, and point out an interesting neutrino signal which will possibly be measured in the near future by IceCube.
学科主题	Physics
收录类别	SCI
资助信息	National Center for Theoretical Science; National Science Council [NSC-101-2112-M-007-006-MY3]; National Tsing Hua University [102N1087E1, 102N2725E1]
原文出处	http://dx.doi.org/10.1103/PhysRevD.89.055021
语种	英语
WOS记录号	WOS:000334305300006
公开日期	2015-06-03
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/15803]
专题	理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式 GB/T 7714	Geng, CQ,Huang, D,Tsai, LH. Imprint of multicomponent dark matter on AMS-02[J]. PHYSICAL REVIEW D,2014,89(5):55021.
APA	Geng, CQ,Huang, D,&Tsai, LH.(2014).Imprint of multicomponent dark matter on AMS-02.PHYSICAL REVIEW D,89(5),55021.
MLA	Geng, CQ,et al."Imprint of multicomponent dark matter on AMS-02".PHYSICAL REVIEW D 89.5(2014):55021.