On the high-energy cosmic neutrinos seen by IceCube

[摘要] We analyze the subset of high energy neutrino events observed by IceCube above 60 TeV, combined with the information provided by passing muons, aiming to probe the flavor of cosmic neutrinos. First, we compare the observed track-to-shower ratio with the predictions for a cosmic neutrino population, taking into account the different production mechanisms and the uncertainties due to neutrino oscillations. Our results corroborate the hypotheses that cosmic neutrinos have been seen. In addition, we show that the possibility of neutrinos decay is disfavored at about 2σ level of significance for both the normal and inverted neutrino mass hierarchy.

[发布机构] Gran Sasso Science Institute, L'Aquila (AQ), Italy^1;INFN, Laboratori Nazionali Del Gran Sasso, Assergi (AQ), Italy^2;University of l'Aquila, Physics and Chemistry Department, L'Aquila (AQ), Italy^3

[效力级别] 天文学 [学科分类] 天文学(综合)

[关键词] Cosmic neutrinos;High energy neutrinos;Ice cubes;Neutrino mass;Neutrino oscillations;Production mechanisms