Flavor Structure of the Cosmic-Ray Electron/Positron Excesses at DAMPE
Flavor Structure of the Cosmic-Ray Electron/Positron Excesses at DAMPE
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DAMPE 宇宙射线电子/正电子过量的味道结构
DOI:
10.1016/j.physletb.2018.03.065
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发表时间:
2017-12
影响因子:
4.4
通讯作者:
Yu-Cheng Wang
中科院分区:
文献类型:
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作者:
Shao-Feng Ge;Hong-Jian He;Yu-Cheng Wang
Abstract The Dark Matter Particle Explorer (DAMPE) satellite detector announced its first result for measuring the cosmic-ray electron/positron (CRE) energy spectrum up to 4.6 TeV, including a tentative peak-like event excess at (1.3–1.5) TeV. In this work, we uncover a significant hidden excess in the DAMPE CRE spectrum over the energy range (0.6–1.1) TeV, which has a non-peak-like structure. We propose a new mechanism to explain this excess by a set of 1.5 TeV μ±events with subsequent decays into e±plus neutrinos. For explaining this new excess together with the peak excess around 1.4 TeV, we demonstrate that the flavor structure of the original lepton final-state produced by dark matter (DM) annihilations (or other mechanism) should have a composition ratio N e:(N μ+ 1 6 N τ)= 1: y, with y≃ 2.6–10.8. For lepton portal DM models, this puts nontrivial constraint on the lepton-DM-mediator couplings λ e:(λ μ 4+ 1 6 λ τ 4) 1 4= 1: y 1 4 with a narrow range y 1 4≃ 1.3–1.8.
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DOI:
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发表时间:
2017-12
期刊:
arXiv: High Energy Physics - Phenomenology
影响因子:
--
作者:
Ran Ding;Zhi-Long Han;Lei Feng;B. Zhu
通讯作者:
Ran Ding;Zhi-Long Han;Lei Feng;B. Zhu
影响因子:
4.4
作者:
Chao Wei;Guo Huai Ke;Li Hao Lin;Shu Jing
通讯作者:
Shu Jing
影响因子:
5
作者:
Cao Junjie;Feng Lei;Guo Xiaofei;Shang Liangliang;Wang Fei;Wu Peiwen
通讯作者:
Wu Peiwen
影响因子:
4.4
作者:
A. Fowlie
通讯作者:
A. Fowlie
DOI:
10.1063/1.4968898
发表时间:
2016-09
期刊:
arXiv: High Energy Astrophysical Phenomena
影响因子:
--
作者:
J. Holder
通讯作者:
J. Holder