R-violating Decay of Wino Dark Matter and electron/positron Excesses in the PAMELA/Fermi Experiments

Abstract

We show that R-parity violating decay of Wino dark matter of mass \sim 3 TeV can naturally account for the flux and spectral shape of the cosmic-ray electrons and positrons observed by the PAMELA and Fermi satellites. To provide a theoretical basis for the scenario, we also present a model that trilinear R-parity breaking appears with a coefficient suppressed by powers of the gravitino mass, which naturally leads to the Wino lifetime of O(10^26) sec.

11 pages, 4 figures

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• Galactic Signatures of Decaying Dark Matter
• Dark matter in the supersymmetric radiative seesaw model with an anomalous U(1) symmetry
• Decaying neutralino dark matter in anomalous $U(1{)}_H$ models
• Signals of dark matter in a supersymmetric two dark matter model
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