SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 141: Neutrino Astronomy V

T 141.5: Vortrag

Donnerstag, 23. März 2023, 18:30–18:45, POT/0251

Search for the Prompt Neutrino Flux with IceCube — •Jakob Böttcher, Philipp Fürst, Erik Ganster, Matthias Thiesmeyer, and Christopher Wiebusch for the IceCube collaboration — III. Physikalisches Insitut b, RWTH Aachen University

For about a decade the IceCube Neutrino Observatory has been measuring a high-energy diffuse astrophysical neutrino flux. At these energies, an important source of background is prompt atmospheric neutrinos produced in decays of charmed mesons that are part of cosmic-ray-induced air showers. The production yield of charmed mesons in hadronic interactions, and thus the flux of prompt neutrinos, is not well known and has not yet been observed by IceCube. The analysis of up-going muon neutrino-induced tracks in IceCube provides a large sample of atmospheric neutrinos which likely includes prompt neutrinos. However, the measurement of a subdominant prompt neutrino flux strongly depends on the hypothesis for the dominating astrophysical neutrino flux. This makes the estimation of upper limits on the prompt neutrino flux challenging. We discuss the extent of this model dependency on the astrophysical flux and propose a method to calculate robust upper limits. Furthermore, a possible dedicated search of the prompt neutrino flux using multiple IceCube detection channels is outlined.