Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 24: Neutrinoastronomie II

T 24.5: Talk

Tuesday, March 20, 2018, 17:30–17:45, Philo-HS1

Measuring the Flavor Ratio of High-Energy Neutrino Events in IceCube — •Juliana Stachurska — DESY Zeuthen

The IceCube Neutrino Observatory at the South Pole detects Cherenkov light from charged particles produced in neutrino interactions. At the highest energies, the neutrino flux is of cosmic origin, with an expected flavor ratio of ν_e:ν_µ:ν_τ of 1:1:1, but its astrophysical sources are yet unknown. A measurement of the flavor ratio on Earth can provide important information to constrain sources and production mechanisms. But as of today, no high energy tau neutrino interaction has been identified in the IceCube data, leaving the ντ fraction of the cosmic neutrino flux largely unconstrained. This work aims at identifying high-energy tau neutrino interactions creating tau leptons with a mean decay length of 50m per PeV neutrino energy. Above energies of ∼ 100 TeV they produce a unique and resolvable Double Cascade signature which together with the Single Cascade, and Track event topologies will be used to measure the flavor ratio of IceCube’s high-energy events.