Interpreting IceCube 6-year HESE data as an evidence for hundred TeV decaying Dark Matter

The assumption of a single astrophysical power-law flux to explain the IceCube 6-year HESE extraterrestrial events yields a large spectral index that is in tension with gamma-ray observations and the 6-year up-going muon neutrinos data. Adopting a spectral index belonging to the range [2.0,2.2], which is compatible with the one deduced by the analysis performed on the 6-year up-going muon neutrinos data and with p–p astrophysical sources, the latest IceCube data show an up to 2.6σ excess in the number of events in the energy range 40–200 TeV. We interpret such an excess as a decaying Dark Matter signal and we perform a likelihood-ratio statistical test to compare the two-component scenario with respect to the single-component one