AMS-02 positron excess and indirect detection of three-body decaying dark matter

Hsin Chia Cheng, Wei Chih Huang, Xiaoyuan Huang, Ian Low, Yue Lin Sming Tsai, Qiang Yuan

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


We consider indirect detection of meta-stable dark matter particles decaying into a stable neutral particle and a pair of standard model fermions. Due to the softer energy spectra from the three-body decay, such models could potentially explain the AMS-02 positron excess without being constrained by the Fermi-LAT gamma-ray data and the cosmic ray anti-proton measurements. We scrutinize over different final state fermions, paying special attention to handling of the cosmic ray background and including various contributions from cosmic ray propagation with the help of the LIKEDM package. It is found that primary decays into an electron-positron pair and a stable neutral particle could give rise to the AMS-02 positron excess and, at the same time, stay unscathed against the gamma-ray and anti-proton constraints. Decays to a muon pair or a mixed flavor electron-muon pair may also be viable depending on the propagation models. Decays to all other standard model fermions are severely disfavored.

Original languageEnglish (US)
Article number041
JournalJournal of Cosmology and Astroparticle Physics
Issue number3
StatePublished - Mar 21 2017


  • cosmic ray theory
  • dark matter theory
  • gamma ray theory

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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