Soft Gamma Rays from Heavy WIMPs
  We propose an explanation of the galactic center gamma ray excess by supersymmetric WIMPs as heavy as 500 GeV. The lightest neutralino annihilates into vector-like leptons or quarks which cascade decay through intermediate Higgs bosons. Due to the long decay chains, the gamma ray spectrum is much softer than naively expected and peaks at GeV energies. The model predicts correlated diboson and dijet signatures to be tested at the LHC. 
Manuel Ernst Krauss, Toby Opferkuch, Florian Staub, Martin Wolfgang   Winkler
hep-ph astro-ph.HE