München 2009 – scientific programme

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T: Fachverband Teilchenphysik

T 22: Theoretische Astroteilchenphysik und Kosmologie 1

T 22.4: Talk

Monday, March 9, 2009, 17:45–18:00, M114

Cosmic-Ray e⁺/e⁻ Anomalies and Decaying Dark Matter — Alejandro Ibarra and •David Tran — Technische Universität München

The PAMELA collaboration recently reported a significant excess of high-energy cosmic-ray positrons over the astrophysical expectations. In addition, the discovery of an unexpected spectral feature in the combined positron and electron fluxes at about 700 GeV was reported by the ATIC/PPB-BETS collaborations. We discuss interpretations of these observations in terms of dark matter and the resulting implications for the properties of the dark matter particles. In particular, we examine different scenarios with unstable dark matter that decays into charged leptons at late times, providing a possible explanation of the observed cosmic-ray anomalies.