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Niu, JS; Li, TJ; Ding, R2; Zhu, B3; Xue, HF; Wang, Y5
Bayesian analysis of the break in DAMPE lepton spectra
Source PublicationPHYSICAL REVIEW D
AbstractRecently, 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.
Subject AreaAstronomy & Astrophysics ; Physics
MOST Discipline CatalogueAstronomy & Astrophysics ; Physics, Particles & Fields
Indexed BySCIE
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Cited Times:18[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.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
Recommended Citation
GB/T 7714
Niu, JS,Li, TJ,Ding, R,et al. Bayesian analysis of the break in DAMPE lepton spectra[J]. PHYSICAL REVIEW D,2018,97(8):83012.
APA Niu, JS,Li, TJ,Ding, R,Zhu, B,Xue, HF,&Wang, Y.(2018).Bayesian analysis of the break in DAMPE lepton spectra.PHYSICAL REVIEW D,97(8),83012.
MLA Niu, JS,et al."Bayesian analysis of the break in DAMPE lepton spectra".PHYSICAL REVIEW D 97.8(2018):83012.
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