Dark Matter Interpretation of Recent Electron and Positron Data

The recently released Fermi-LAT data on the sum of electrons and positrons is analyzed in terms of dark matter models and the possibility of a sharp break in the diffuse gamma-ray spectrum coming from final state radiation is predicted.

Abstract

We analyze the recently released Fermi-LAT data on the sum of electrons and positrons. Compared to a conventional, pre-Fermi, background model, a surprising excess in the several hundred GeV range is found and here we analyze it in terms of dark matter models. We also compare with newly published results from PAMELA and H.E.S.S., and find models giving very good fits to these data sets as well. If this dark matter interpretation is correct, we also predict the possibility of a sharp break in the diffuse gamma-ray spectrum coming from final state radiation.