Münster 2017 – scientific programme
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T: Fachverband Teilchenphysik
T 13: Neutrinoastronomie 1
T 13.8: Talk
Monday, March 27, 2017, 18:35–18:50, H 1
Astrophysical Neutrino Production Diagnostics with the Glashow Resonance — •Daniel Biehl1, Anatoli Fedynitch1, Andrea Palladino2, Tom Weiler3, and Walter Winter1 — 1DESY, Platanenallee 6, 15738 Zeuthen, Germany — 2Gran Sasso Science Institute, L’Aquila (AQ), Italy — 3Department of Physics & Astronomy, Vanderbilt University, Nashville, TN 37235, USA
We study the Glashow resonance as diagnostic of the production processes of ultra-high energy neutrinos. Photohadronic interactions in astrophysical environments do not produce any electron antineutrinos via the Delta resonance. In contrast, proton-proton sources show a significant fraction of electron antineutrinos. This difference results in different event rates at the detector, making both processes distinguishable from each other after a certain exposure even after mixing. However, under realistic assumptions, also in the photohadronic case there is a significant contamination by electron antineutrinos. Thus, it is extremely challenging to discriminate between a pp and pγ scenario, even with IceCube-Gen2. Nevertheless, we find that the Glashow resonance can serve as a smoking gun signature of neutrino production from photohadronic interactions of heavier nuclei. Finally, we quantify the exposures for which the non-observation of the Glashow resonance exerts pressure on certain scenarios.