Gamma-ray constraints on decaying dark matter

Chuan Ren Chen, Sourav K. Mandal, Fuminobu Takahashi

Research output: Contribution to journalArticlepeer-review


The anomalies in positron fraction observed in PAMELA and total flux of electrons and positron reported by Fermi can be explained by a decaying dark matter. The agreement between astrophysical background and observed data in anti-proton indicates a lep-tophilic dark matter and constrains the hadronic decay branching ratios. In this work, we study the constrains on decaying rates of a dark matter to various 2-body final states using the Fermi and HESS gamma-ray data. We find that μ+μ- or τ+τ- final state is preferred to simultaneously explain the excesses and meet the gamma-ray constrains.

Original languageEnglish
Pages (from-to)969-975
Number of pages7
JournalModern Physics Letters A
Issue number11-12
Publication statusPublished - 2010 Apr 20


  • Cosmic-ray
  • Dark matter


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