PAMELA data and leptonically decaying dark matter

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	PAMELA data and leptonically decaying dark matter
	Yin, Peng-fei; Yuan, Qiang; Liu, Jia; Zhang, Juan; Bi, Xiao-jun; Zhu, Shou-hua; Zhang, Xinmin; Yin, PF , Peking Univ, Inst Theoret Phys, Beijing 100871, Peoples R China
刊名	PHYSICAL REVIEW D
	2009
卷号	79 期号:2 页码:-
关键词	R-parity Violation Cosmic-ray Nuclei Solar Minimum Activity Continuum Gamma-rays Energy-spectra Antiproton Spectrum Positron Fraction Propagation Galaxy Model
ISSN号	1550-7998
英文摘要	Recently PAMELA released their first results on the positron and antiproton ratios. Stimulated by the new data, we studied the cosmic ray propagation models and calculated the secondary positron and antiproton spectra. The low energy positron ratio can be consistent with data in the convection propagation model. Above similar to 10 GeV PAMELA data shows a clear excess on the positron ratio. However, the secondary antiproton is roughly consistent with the data. The positron excess may be evidence of dark matter annihilation or decay. We compare the positron and antiproton spectra with the data by assuming that dark matter annihilates or decays into different final states. The PAMELA data actually excludes quark pairs being the main final states, and disfavors gauge boson final states. Only in the case of leptonic final states can the positron and antiproton spectra be explained simultaneously. We also compare the decaying and annihilating dark matter scenarios which can account for the PAMELA results and find that the decaying dark matter is preferred. Finally, we consider a decaying neutralino dark matter model in the frame of supersymmetry with R-parity violation. The PAMELA data is well fitted with a neutralino mass of 600 similar to 2000 GeV and a lifetime of similar to 10(26) seconds. We also demonstrate that a neutralino with mass around 2 TeV can fit PAMELA and ATIC data simultaneously.
学科主题	Physics
URL标识	查看原文
WOS记录号	WOS:000262979800022
公开日期	2012-08-02
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/5408]
专题	理论物理研究所_理论物理所1978-2010年知识产出
通讯作者	Yin, PF , Peking Univ, Inst Theoret Phys, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Yin, Peng-fei,Yuan, Qiang,Liu, Jia,et al. PAMELA data and leptonically decaying dark matter[J]. PHYSICAL REVIEW D,2009,79(2):-.
APA	Yin, Peng-fei.,Yuan, Qiang.,Liu, Jia.,Zhang, Juan.,Bi, Xiao-jun.,...&Yin, PF , Peking Univ, Inst Theoret Phys, Beijing 100871, Peoples R China.(2009).PAMELA data and leptonically decaying dark matter.PHYSICAL REVIEW D,79(2),-.
MLA	Yin, Peng-fei,et al."PAMELA data and leptonically decaying dark matter".PHYSICAL REVIEW D 79.2(2009):-.