Constraints on dark matter annihilation from AMS-02 results

Joachim Kopp
Phys. Rev. D 88, 076013 – Published 24 October 2013

Abstract

We use recently released data on the positron-to-electron ratio in cosmic rays from the AMS-02 experiment to constrain dark matter annihilation in the Milky Way. Due to the yet unexplained positron excess, limits are generally weaker than those obtained using other probes, especially gamma rays. This also means that explaining the positron excess in terms of dark matter annihilation is difficult. Only if very conservative assumptions on the dark matter distribution in the Galactic center region are adopted, it may be possible to accommodate dark matter annihilating to leptons with a cross section above 1024cm3/sec. We comment on several theoretical mechanisms to explain such large annihilation cross sections.

  • Figure
  • Figure
  • Received 8 April 2013

DOI:https://doi.org/10.1103/PhysRevD.88.076013

© 2013 American Physical Society

Authors & Affiliations

Joachim Kopp*

  • Max Planck Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany

  • *jkopp@mpi-hd.mpg.de

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Vol. 88, Iss. 7 — 1 October 2013

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