Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 4: Cosmic rays 1

T 4.9: Talk

Monday, March 4, 2024, 18:00–18:15, Geb. 20.30: 2.059

Angular dependence of the muon neutrino flux — •Leonora Kardum, Karolin Hymon, Mirco Hünnefeld, Pascal Gutjahr, and Jean-Marco Alameddine — Technische Universität Dortmund

The IceCube Neutrino Observatory, a cubic kilometer detector nestled in the ice at the geographic South Pole, exhibits the capability to detect particles across a broad energy range, spanning from several GeV up to PeV. This enables precise measurements of the diffuse neutrino spectrum made from three components: astrophysical (originating from extraterrestrial sources), conventional (resulting from pion and kaon decays in atmospheric Cosmic Ray cascades), and the as-yet-undetected prompt component from the decay of charmed hadrons.

This work reveals the angular dependence and the all-component flux. The unfolding method, a composite model-independent technique, is employed to derive values from related quantities, eliminating the impact of assumptions made in the process. Specifically, we unfold the muon neutrino energy spectrum, incorporating a novel technique for rebinning the observable space to ensure adequate event numbers in the low statistic region at the highest energies.

Our presentation includes the unfolded energy and zenith angle spectrum reconstructed from IceCube data compared to model expectations and previous measurements, providing valuable insights into the accuracy of predicted angular dependencies in the atmospheric neutrino flux.

Keywords: unfolding; neutrino; flux reconstruction; diffuse flux