Markov chain Monte Carlo study on dark matter property related to the cosmic e(+/-) excesses
Liu J(刘杰); Li H(李虹); Zhang XM(张新民); Yuan Q(袁强); Bi XJ(毕效军); Liu, J; Yuan, Q; Bi, XJ; Li, H; Zhang, XM
刊名PHYSICAL REVIEW D
2010
卷号81期号:2页码:23516
学科分类Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.81.023516
通讯作者[Liu, Jie ; Li, Hong ; Zhang, Xinmin] Chinese Acad Sci, Inst High Energy Phys, Div Theoret Phys, Beijing 100049, Peoples R China ; [Yuan, Qiang ; Bi, Xiaojun] Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China ; [Li, Hong ; Zhang, Xinmin] Chinese Acad Sci, TPCSF, Beijing 100049, Peoples R China
文章类型Article
英文摘要In this paper we develop a Markov chain Monte Carlo code to study the dark matter properties in frameworks to interpret the recent observations of cosmic ray electron/positron excesses. We assume that the dark matter particles couple dominantly to leptons and consider two cases, annihilating or decaying into lepton pairs, respectively. The constraint on the central density profile from the H. E. S. S. observation of diffuse gamma rays around the Galactic center is also included in the Markov chain Monte Carlo code self-consistently. In the numerical study, we have considered two cases of the background: fixed e(+)e(-) background and the relaxed one. Two data sets of electrons/positrons, i.e. PAMELA + ATIC (Data set I) and PAMELA + Fermi-LAT + H: E: S: S: (Data set II), are fitted independently, considering the current inconsistence between the observational data. We find that for Data set I, dark matter with m(chi) approximate to 0.70 TeV for annihilation (or 1.4 TeV for decay) and a non-negligible branching ratio to e(+)e(-) channel is favored; while for Data set II, m(chi) approximate to 2.2 TeV for annihilation (or 4.5 TeV for decay) and the combination of mu(+)mu(-) and tau(+)tau(-) final states can best fit the data. We also show that the background of electrons and positrons actually will significantly affect the branching ratios. The H. E. S. S. observation of gamma rays in the Galactic center ridge puts a strong constraint on the central density profile of the dark matter halo for the annihilation dark matter scenario. In this case the Navarro-Frenk-White profile, which is regarded as the typical predication from the cold dark matter scenario, is excluded with a high significance (> 3 sigma). For the decaying dark matter scenario, the constraint is much weaker.
类目[WOS]Astronomy & Astrophysics ; Physics, Particles & Fields
研究领域[WOS]Astronomy & Astrophysics ; Physics
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语种英语
WOS记录号WOS:000275068900032
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被引频次:18[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/240498
专题中国科学院高能物理研究所_理论物理室_期刊论文
中国科学院高能物理研究所_粒子天体物理中心
中国科学院高能物理研究所_多学科研究中心
作者单位中国科学院高能物理研究所
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Liu J,Li H,Zhang XM,et al. Markov chain Monte Carlo study on dark matter property related to the cosmic e(+/-) excesses[J]. PHYSICAL REVIEW D,2010,81(2):23516.
APA 刘杰.,李虹.,张新民.,袁强.,毕效军.,...&Zhang, XM.(2010).Markov chain Monte Carlo study on dark matter property related to the cosmic e(+/-) excesses.PHYSICAL REVIEW D,81(2),23516.
MLA 刘杰,et al."Markov chain Monte Carlo study on dark matter property related to the cosmic e(+/-) excesses".PHYSICAL REVIEW D 81.2(2010):23516.
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