Gamma-ray constraints on hadronic and leptonic activities of decaying dark matter

Chuan Ren Chen*, Sourav K. Mandal, Fuminobu Takahashi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


While the excess in cosmic-ray electrons and positrons reported by PAMELA and Fermi may be explained by dark matter decaying primarily into charged leptons, this does not necessarily mean that dark matter should not have any hadronic decay modes. In order to quantify the allowed hadronic activities, we derive constraints on the decay rates of dark matter into WW, ZZ, hh, qq and gg using the Fermi and HESS gamma-ray data. We also derive gamma-ray constraints on the leptonic e+e-, μ+μ- and τ+τ- final states. We find that dark matter must decay primarily into μ+μ- or τ+τ - in order to simultaneously explain the reported excess and meet all gamma-ray constraints.

Original languageEnglish
Article number023
JournalJournal of Cosmology and Astroparticle Physics
Issue number1
Publication statusPublished - 2010
Externally publishedYes


  • Cosmic ray theory
  • Dark matter theory
  • Gamma ray experiments

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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