Dark Matter scenarios at IceCube

por Marco Chianese (INFN & Univ. di Napoli Federico II)

viernes 29 ene. 2016 12:00 → 13:00 Europe/Madrid

Nave Exp. Sala de Audiovisuales (IFIC)

IceCube evidence for extraterrestrial neutrinos poses the intriguing

puzzle concerning their origin. The strange features of the measured flux
could favor a top-down explanation instead of a more standard
astrophysical one. The PeV neutrinos could be indeed orginated
by the decay of very heavy Dark Matter particles. In particular,
we consider a leptophyllic four body interaction term
that has the characteristics to be "natural" in the coupling (no
fine tuning required), and defined by a small number of free parameters.
Moreover, the latest IceCube data show a 2-sigma excess at low energy
(60 - 100 TeV) with respect to an astrosphysical power-law with spectral
index -2. By means of a statistical analysis on the angular distribution
of the arrival directions,we show that only the scenario of
annihilitating Dark Matter is already excluded by IceCube data.