Flavor structure of the cosmic-ray electron/positron excesses at DAMPE

Flavor structure of the cosmic-ray electron/positron excesses at DAMPE

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...

Full description

Bibliographic Details
Main Authors: Shao-Feng Ge, Hong-Jian He, Yu-Chen Wang
Format: Article
Language:English
Published: Elsevier 2018-06-01
Series:Physics Letters B
Online Access:http://www.sciencedirect.com/science/article/pii/S0370269318302612
id doaj-89815aa60bb14ae49d148eb0107b55cc
record_format Article
spelling doaj-89815aa60bb14ae49d148eb0107b55cc2020-11-24T23:05:55ZengElsevierPhysics Letters B0370-26932018-06-017818894Flavor structure of the cosmic-ray electron/positron excesses at DAMPEShao-Feng Ge0Hong-Jian He1Yu-Chen Wang2Kavli IPMU (WPI), UTIAS, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan; Department of Physics, University of California, Berkeley, CA 94720, USA; Corresponding authors.T.D. Lee Institute, Shanghai 200240, China; School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China; Institute of Modern Physics, Tsinghua University, Beijing 100084, China; Center for High Energy Physics, Peking University, Beijing 100871, China; Corresponding authors.Institute of Modern Physics, Tsinghua University, Beijing 100084, ChinaThe 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 Ne:(Nμ+16Nτ)=1:y, with y≃2.6–10.8. For lepton portal DM models, this puts nontrivial constraint on the lepton-DM-mediator couplings λe:(λμ4+16λτ4)14=1:y14 with a narrow range y14≃1.3–1.8. Keywords: High energy cosmic ray, Muon decay, Dark matter annihilationhttp://www.sciencedirect.com/science/article/pii/S0370269318302612
collection DOAJ
language English
format Article
sources DOAJ
author Shao-Feng Ge
Hong-Jian He
Yu-Chen Wang
spellingShingle Shao-Feng Ge
Hong-Jian He
Yu-Chen Wang
Flavor structure of the cosmic-ray electron/positron excesses at DAMPE
Physics Letters B
author_facet Shao-Feng Ge
Hong-Jian He
Yu-Chen Wang
author_sort Shao-Feng Ge
title Flavor structure of the cosmic-ray electron/positron excesses at DAMPE
title_short Flavor structure of the cosmic-ray electron/positron excesses at DAMPE
title_full Flavor structure of the cosmic-ray electron/positron excesses at DAMPE
title_fullStr Flavor structure of the cosmic-ray electron/positron excesses at DAMPE
title_full_unstemmed Flavor structure of the cosmic-ray electron/positron excesses at DAMPE
title_sort flavor structure of the cosmic-ray electron/positron excesses at dampe
publisher Elsevier
series Physics Letters B
issn 0370-2693
publishDate 2018-06-01
description 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 Ne:(Nμ+16Nτ)=1:y, with y≃2.6–10.8. For lepton portal DM models, this puts nontrivial constraint on the lepton-DM-mediator couplings λe:(λμ4+16λτ4)14=1:y14 with a narrow range y14≃1.3–1.8. Keywords: High energy cosmic ray, Muon decay, Dark matter annihilation
url http://www.sciencedirect.com/science/article/pii/S0370269318302612
work_keys_str_mv AT shaofengge flavorstructureofthecosmicrayelectronpositronexcessesatdampe
AT hongjianhe flavorstructureofthecosmicrayelectronpositronexcessesatdampe
AT yuchenwang flavorstructureofthecosmicrayelectronpositronexcessesatdampe
_version_ 1725624886771056640

Similar Items