Abstract
Precise measurements of spectra of cosmic ray electrons and positrons can effectively probe the nature of dark matter (DM) particles. In a class of models where DM particles initially annihilate into a pair of intermediate particles which then decay into standard model particles, box-shaped spectra can be generated. Such spectra are distinct from astrophysical backgrounds and can probably be regarded as characteristic features of the DM annihilation. In this work, we search for such a feature in the total electron plus positron spectrum measured by AMS-02 and DAMPE. No significant evidence for such a DM annihilation component has been found. The 95% confidence level upper limits of the velocity-weighted annihilation cross section are derived, which range from for DM mass of 50 GeV to for DM mass of 10 TeV.
- Received 6 December 2017
- Revised 10 August 2018
DOI:https://doi.org/10.1103/PhysRevD.98.063010
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society