Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 30: Cosmic rays 3

T 30.7: Talk

Tuesday, March 5, 2024, 17:30–17:45, Geb. 20.30: 2.059

Twelve Years Observation of the Seasonal Variation of Atmopheric Neutrino Flux with IceCube — •Shuyang Deng, Jakob Böttcher, Hannah Erpenbeck, Tobias Kramer, and Christopher Wiebusch for the IceCube collaboration — III. Physikalisches Institut B RWTH Aachen University

High-energy atmospheric muon neutrinos are detected by IceCube with a high rate of almost a hundred thousand events per year. These neutrinos are produced in the hadronic development of air showers in the upper atmosphere. Their flux is expected to correlate with atmospheric properties such as temperature, and thus features a seasonal variation. In this talk, we present an updated measurement of the seasonal variation of the atmospheric muon neutrino flux, utilizing the 12-year neutrino sample (Northern Tracks) produced by the IceCube Neutrino Observatory. We correlate the measured neutrino rates with the atmospheric temperature profiles measured by satellites. The updated measurement yields results that are compatible with the previous studies, while confirming a tension between the theoretical predictions and experimental measurements with higher statistical significance. Further investigations on systematic effects show that the observation not only exhibits a weaker correlation compared to predictions, but also deviates from the expected linear relation between atmospheric neutrino flux and the atmospheric temperature.

Keywords: IceCube; Atmospheric Neutrino; Seasonal Variation; Air Shower; Cosmic Rays