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Seasonal Variations of the Atmospheric Muon Neutrino Spectrum measured with IceCube
Preprint   Open access

Seasonal Variations of the Atmospheric Muon Neutrino Spectrum measured with IceCube

R Abbasi, M Ackermann, J Adams, S. K Agarwalla, J. A Aguilar, M Ahlers, J. M Alameddine, N. M Amin, K Andeen, C Argüelles, …
25 Feb 2025
DOI: https://doi.org/10.48550/arxiv.2502.17890
url
https://arxiv.org/abs/2502.17890View
Preprint (Author's original) Open arXiv.org - Non-exclusive license to distribute

Abstract

Physics - High Energy Astrophysical Phenomena Physics - High Energy Physics - Experiment
This study presents an energy-dependent analysis of seasonal variations in the atmospheric muon neutrino spectrum, using 11.3 years of data from the IceCube Neutrino Observatory. By leveraging a novel spectral unfolding method, we explore the energy range from 125 GeV to 10 TeV for zenith angles between 90{\deg} to 110{\deg}, corresponding to the Antarctic atmosphere. Our findings reveal that the seasonal variation amplitude decreases with energy reaching ($-4.6 \pm 1.1$)\% during Austral winter and increases ($+3.9 \pm 1.2$)\% during Austral summer relative to the annual average at 10TeV. While the unfolded flux exceeds the model predictions by up to 30\%, the differential measurement of seasonal variations remains unaffected. The measured seasonal variations of the muon neutrino spectrum are consistent with theoretical predictions using the MCEq code and the NRLMSISE-00 atmospheric model.

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