A simple and natural interpretations of the DAMPE cosmic-ray electron/positron spectrum within two sigma deviations

Niu, Jia-Shu (Aff1, 0000 0004 1760 2008, Institute of Theoretical Physics, State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, 030006, Taiyuan, China) (Aff2, 0000000119573309, CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, 100190, Beijing, China) (Aff3, 0000 0004 1797 8419, School of Physical Sciences, University of Chinese Academy of Sciences, No. 19A Yuquan Road, 100049, Beijing, China) ; Li, Tianjun (Aff2, 0000000119573309, CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, 100190, Beijing, China) (Aff3, 0000 0004 1797 8419, School of Physical Sciences, University of Chinese Academy of Sciences, No. 19A Yuquan Road, 100049, Beijing, China) ; Xu, Fang-Zhou (Aff2, 0000000119573309, CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, 100190, Beijing, China) (Aff4, 0000 0001 0662 3178, Institute of Modern Physics and Center for High Energy Physics, Tsinghua University, 100084, Beijing, China)

08 February 2019

Abstract: The DArk Matter Particle Explorer (DAMPE) experiment has recently announced the first results for the measurement of total electron plus positron fluxes between 25 GeV and 4.6 TeV. A spectral break at about 0.9 TeV and a tentative peak excess around 1.4 TeV have been found. However, it is very difficult to reproduce both the peak signal and the smooth background including spectral break simultaneously. We point out that the numbers of events in the two energy ranges (bins) close to the 1.4 TeV excess have 1σ deficits. With the basic physics principles such as simplicity and naturalness, we consider the -2σ , +2σ , and -1σ deviations due to statistical fluctuations for the 1229.3 GeV bin, 1411.4 GeV bin, and 1620.5 GeV bin. Interestingly, we show that all the DAMPE data can be explained consistently via both the continuous distributed pulsar and dark matter interpretations, which have χ2≃17.2 and χ2≃13.9 ( for all the 38 points in DAMPE electron/positron spectrum with 3 of them revised ), respectively. These results are different from the previous analysis by neglecting the 1.4 TeV excess. At the same time, we do a similar global fitting on the newly released CALET lepton data, which could also be interpreted by such configurations. Moreover, we present a U(1)D dark matter model with the Breit–Wigner mechanism, which can provide the proper dark matter annihilation cross section and escape the CMB constraint. Furthermore, we suggest a few ways to test our proposal.


Published in: EPJC 79 (2019) 125
Published by: Springer/Società Italiana di Fisica
DOI: 10.1140/epjc/s10052-019-6625-7
License: CC-BY-3.0



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