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

TL;DR

This paper proposes that R-parity violating decay of 3 TeV Wino dark matter can explain the electron and positron excesses observed by PAMELA and Fermi, supported by a theoretical model with suppressed R-parity breaking.

Contribution

It introduces a model where R-parity violation causes Wino decay with a suitable lifetime, explaining cosmic-ray excesses.

Findings

Wino decay accounts for observed electron/positron fluxes

The model predicts a Wino lifetime of about 10^26 seconds

R-parity breaking coefficient is naturally suppressed by gravitino mass

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.