Bayesian analysis of the break in DAMPE lepton spectra

doi:10.1103/PhysRevD.97.083012

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	Bayesian analysis of the break in DAMPE lepton spectra
	Zhu, B 3; Niu, JS ; Li, TJ; Ding, R 2; Xue, HF ; Wang, Y 5
刊名	PHYSICAL REVIEW D
	2018
卷号	97 期号:8 页码:83012
关键词	RAY POSITRON FRACTION DARK-MATTER GAMMA-RAY COSMIC-RAYS SUPERNOVA-REMNANTS SOLAR MODULATION PULSARS PARTICLES ELECTRONS PAMELA
ISSN号	2470-0010
DOI	10.1103/PhysRevD.97.083012
英文摘要	Recently, DAMPE has released its first results on the high-energy cosmic-ray electrons and positrons (CREs) from about 25 GeV to 4.6 TeV, which directly detect a break at similar to 1 TeV. This result gives us an excellent opportunity to study the source of the CREs excess. In this work, we used the data for proton and helium flux (from AMS-02 and CREAM), (p) over bar /p ratio (from AMS-02), positron flux (from AMS-02) and CREs flux (from DAMPE without the peak signal point at similar to 1.4 TeV) to do global fitting simultaneously, which can account for the influence from the propagation model, the nuclei and electron primary source injection, and the secondary lepton production precisely. For an extra source to interpret the excess in lepton spectrum, we consider two separate scenarios (pulsar and dark matter annihilation via leptonic channels) to construct the bump (greater than or similar to 100 GeV) and the break at similar to 1 TeV. The result shows that (i) in the pulsar scenario, the spectral index of the injection should be nu(psr) similar to 0.65 and the cut-off should be R-c similar to 650 GV; (ii) in dark matter scenario, the dark matter particle's mass is m(x) similar to 1208 GeV, and the cross section is similar to 1.48 x 10(-23) cm(3) s(-1). Moreover, in the dark matter scenario, the tau(tau) over bar annihilation channel is highly suppressed, and a DM model is built to satisfy the fitting results.
学科主题	Astronomy & Astrophysics ; Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/22916]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Sch Phys Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China 3.Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China 4.Yantai Univ, Dept Phys, Yantai 264005, Peoples R China 5.Beijing Normal Univ, Astron Dept, Beijing 100875, Peoples R China 6.Shanxi Univ, Sch Math Sci, Taiyuan 030006, Shanxi, Peoples R China
推荐引用方式 GB/T 7714	Zhu, B,Niu, JS,Li, TJ,et al. Bayesian analysis of the break in DAMPE lepton spectra[J]. PHYSICAL REVIEW D,2018,97(8):83012.
APA	Zhu, B,Niu, JS,Li, TJ,Ding, R,Xue, HF,&Wang, Y.(2018).Bayesian analysis of the break in DAMPE lepton spectra.PHYSICAL REVIEW D,97(8),83012.
MLA	Zhu, B,et al."Bayesian analysis of the break in DAMPE lepton spectra".PHYSICAL REVIEW D 97.8(2018):83012.