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题名: PAMELA data and leptonically decaying dark matter
作者: Yin, Peng-fei ;  Yuan, Qiang ;  Liu, Jia ;  Zhang, Juan ;  Bi, Xiao-jun ;  Zhu, Shou-hua ;  Zhang, Xinmin
刊名: PHYSICAL REVIEW D
出版日期: 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
学科分类: Physics
通讯作者: Yin, PF , Peking Univ, Inst Theoret Phys, Beijing 100871, Peoples R China
部门归属: [Yin, PF; Liu, J; Zhu, SH] Peking Univ, Inst Theoret Phys, Beijing 100871, Peoples R China; [Yin, PF; Liu, J; Zhu, SH] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China; [Yuan, Q; Zhang, J; Bi, XJ] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China; [Bi, XJ] Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China; [Bi, XJ; Zhu, SH] Chinese Acad Sci, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China; [Zhang, XM] Chinese Acad Sci, Inst High Energy Phys, Div Theoret, Beijing 100049, Peoples R China
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.
资助者: Natural Sciences Foundation of China[10775001, 10635030, 10575111, 10773011]; Chinese Ministry of Education; Chinese Academy of Sciences[KJCX3-SYW-N2]
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000262979800022
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5408
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Yin, Peng-fei,Yuan, Qiang,Liu, Jia,et al. PAMELA data and leptonically decaying dark matter[J]. PHYSICAL REVIEW D,2009,79(2):-.
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