Trobada: The Flavour Composition of the high-energy IceCube neutrinos

por Aaron Vincent (IPPP, Durham)

jueves 26 feb. 2015 11:30 → 12:30 Europe/Madrid

Seminar Room, 1.1.1 (IFIC)

The recent detection of 37 high-energy neutrinos of astrophysical origin by the IceCube experiment at the South Pole has signalled the beginning of high-energy neutrino astronomy. At these energies, neutrinos are expected to be produced by pion disintegration after production in high-energy sources. This should lead to a democratic flavour composition at Earth of (1:1:1) electron : muon : tau neutrinos. I will present our analysis of the observed flavour composition of the IceCube events, based on the event topology and energy spectra, and show that the canonical (1:1:1) is not necessarily favoured by the data. I will demonstrate that current observations hint at some compelling puzzles, notably the lack of lower-energy muon neutrinos, as well as an absence of observed events in the expected Glashow resonance peak above 3 PeV.