title: What is the Flavor of the Cosmic Neutrinos Seen by IceCube?
abstract: We analyze the high-energy neutrino events observed by IceCube, aiming to probe the initial flavor of cosmic neutrinos. We study the track-to-shower ratio of the subset with energy above 60 TeV, where the signal is expected to dominate, and show that different production mechanisms give rise to different predictions even accounting for the uncertainties due to neutrino oscillations. We include for the first time the passing muons observed by IceCube in the analysis. They corroborate the hypotheses that cosmic neutrinos have been seen and their flavor matches expectations derived from the neutrino oscillations.
authors.affiliation: Gran Sasso Science Institute, Viale Francesco Crispi 7, I-67100 L'Aquila, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Palladino
authors.affiliation: INFN, Laboratori Nazionali del Gran Sasso, Via G. Acitelli 22, I-67100, Assergi, L'Aquila, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Pagliaroli
authors.affiliation: INFN, Laboratori Nazionali del Gran Sasso, Via G. Acitelli 22, I-67100, Assergi, L'Aquila, Italy.|Physics and Chemistry Department, L'Aquila University, Via Vetoio, I-67010, Coppito L'Aquila, Italy.
authors.forename: F L
authors.initials: FL
authors.lastname: Villante
authors.affiliation: Gran Sasso Science Institute, Viale Francesco Crispi 7, I-67100 L'Aquila, Italy.|INFN, Laboratori Nazionali del Gran Sasso, Via G. Acitelli 22, I-67100, Assergi, L'Aquila, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Vissani