Dark matter annihilations and decays after the AMS-02 positron measurements

Abstract

The AMS-02 collaboration has recently presented measurements of excellent quality of the cosmic electron and positron fluxes as well as the positron fraction. We use the measurements of the positron flux to derive, for the first time, limits on the dark matter annihilation cross section and lifetime for various final states. Working under the well-motivated assumption that a background positron flux exists from spallations of cosmic rays with the interstellar medium and from astrophysical sources, we find strong limits on the dark matter properties which are competitive, although slightly weaker, than those derived from the positron fraction. Specifically, for dark matter particles annihilating only into e+ e- or into mu+ mu-, our limits on the annihilation cross section are stronger than the thermal value when the dark matter mass is smaller than 100 GeV or 60 GeV, respectively.

13 pages, 6 figures. Matches published version

References in corpus (9)

• Observation of an anomalous positron abundance in the cosmic radiation
• Dark Matter Constraints from Observations of 25 Milky Way Satellite Galaxies with the Fermi Large Area Telescope
• Cosmic-ray positron fraction measurement from 1 to 30 GeV with AMS-01
• The origin of the positron excess in cosmic rays
• The cosmic-ray positron energy spectrum measured by PAMELA
• New limits on dark matter annihilation from AMS cosmic ray positron data
• Galactic secondary positron flux at the Earth
• Indirect Searches for Decaying Dark Matter
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