Markov chain Monte Carlo study on dark matter property related to the cosmic e(+/-) excesses
文献类型：期刊论文
| 作者 | 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
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| 刊名 | PHYSICAL REVIEW D
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| 出版日期 | 2010 |
| 卷号 | 81期号:2页码:23516 |
| 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 |
| 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. |
| 学科主题 | Astronomy & Astrophysics; Physics |
| 类目[WOS] | Astronomy & Astrophysics ; Physics, Particles & Fields |
| 研究领域[WOS] | Astronomy & Astrophysics ; Physics |
| 原文出处 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000275068900032 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/240498]  |
| 专题 | 高能物理研究所_理论物理室 高能物理研究所_粒子天体物理中心 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 |
| 推荐引用方式 GB/T 7714 | 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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来源：高能物理研究所
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