Probing the PeV region in the astrophysical neutrino spectrum using 𝜈𝜇 from the Southern sky

R. Abbasi; M. Ackermann; J. Adams; S. K. Agarwalla; J. A. Aguilar; M. Ahlers; J M Alameddine; N. M. Amin; M Hostert; IceCube Collaboration

doi:10.48550/arxiv.2502.19776

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Probing the PeV region in the astrophysical neutrino spectrum using 𝜈𝜇 from the Southern sky

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Probing the PeV region in the astrophysical neutrino spectrum using 𝜈𝜇 from the Southern sky

R. Abbasi, M. Ackermann, J. Adams, S. K. Agarwalla, J. A. Aguilar, M. Ahlers, J M Alameddine, N. M. Amin, M Hostert and IceCube Collaboration

ArXiv.org

Cornell University

02/27/2025

DOI: 10.48550/arxiv.2502.19776

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Abstract

IceCube has observed a diffuse astrophysical neutrino flux over the energy region from a few TeV to a few PeV. At PeV energies, the spectral shape is not yet well measured due to the low statistics of the data. This analysis probes the gap between 1 PeV and 10 PeV by using high-energy downgoing muon neutrinos. To reject the large atmospheric muon background, two complementary techniques are combined. The first technique selects events with high stochasticity to reject atmospheric muon bundles whose stochastic energy losses are smoothed due to high muon multiplicity. The second technique vetoes atmospheric muons with the IceTop surface array. Using 9 years of data, we found two neutrino candidate events in the signal region, consistent with expectation from background, each with relatively high signal probabilities. A joint maximum likelihood estimation is performed using this sample and an independent 9.5-year sample of tracks to measure the neutrino spectrum. A likelihood ratio test is done to compare the single power-law (SPL) vs. SPL+cutoff hypothesis; the SPL+cutoff model is not significantly better than the SPL. High-energy astrophysical objects from four source catalogs are also checked around the direction of the two events. No significant coincidence was found.

Physics - High Energy Astrophysical Phenomena

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Title: Subtitle: Probing the PeV region in the astrophysical neutrino spectrum using 𝜈𝜇 from the Southern sky
Creators: R. Abbasi - Loyola University Chicago
M. Ackermann - Deutsches Elektronen-Synchrotron DESY
J. Adams - University of Canterbury
S. K. Agarwalla - University of Wisconsin–Madison
J. A. Aguilar - Université Libre de Bruxelles
M. Ahlers - University of Copenhagen
J M Alameddine - TU Dortmund University
N. M. Amin - University of Delaware
M Hostert (Contributor)
IceCube Collaboration
Resource Type: Preprint
Publication Details: ArXiv.org
DOI: 10.48550/arxiv.2502.19776
ISSN: 2331-8422
Publisher: Cornell University; Ithaca, New York
Language: English
Date posted: 02/27/2025
Academic Unit: Physics and Astronomy
Record Identifier: 9984946618202771

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Probing the PeV region in the astrophysical neutrino spectrum using 𝜈𝜇 from the Southern sky

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