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T: Fachverband Teilchenphysik
T 58: Neutrinoastronomie 2
T 58.9: Vortrag
Dienstag, 28. März 2017, 18:55–19:10, H 1
Constraints on New Physics from IceCube Neutrino Flavor Composition Measurements — •Lukas Lechner for the IceCube collaboration — DESY Zeuthen, Germany
IceCube measured for the first time the flavor composition of high-energy cosmic neutrinos (E > 10 TeV). This measurement is a powerful tool to constrain the production mechanisms of astrophysical neutrinos and investigate potential deviations from Standard Model predictions. In this work, the influence of matter effects at the source, neutrino decay and light sterile neutrinos on the expected neutrino flavor ratio from astrophysical sources are studied. In particular, the effects on the flavor composition of pseudo-Dirac neutrinos with mass squared differences δ m2 < 10−16 eV2 between the active and sterile states are examined. For such small mass differences oscillation phenomena could only be observed over cosmic baselines. The scenarios studied take into account current constraints and uncertainties on the neutrino mass differences and the 3 × 3 mixing (sub-)matrix. The expected effects on the observable flavor composition are presented and compared to current constraints from the IceCube detector, as well as the expected sensitivity of the envisioned IceCube-Gen2 neutrino telescope.