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Characterization of the astrophysical diffuse neutrino flux using starting track events in IceCube
Loyola Univ Chicago, Dept Phys, Chicago, IL 60660 USA.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.ORCID iD: 0000-0002-7448-4189
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.ORCID iD: 0000-0001-8588-7306
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.ORCID iD: 0000-0003-1510-1712
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Number of Authors: 4182024 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 110, no 2, article id 022001Article in journal (Refereed) Published
Abstract [en]

A measurement of the diffuse astrophysical neutrino spectrum is presented using IceCube data collected from 2011-2022 (10.3 years). We developed novel detection techniques to search for events with a contained vertex and exiting track induced by muon neutrinos undergoing a charged-current interaction. Searching for these starting track events allows us to not only more effectively reject atmospheric muons but also atmospheric neutrino backgrounds in the southern sky, opening a new window to the sub-100 TeV astrophysical neutrino sky. The event selection is constructed using a dynamic starting track veto and machine learning algorithms. We use this data to measure the astrophysical diffuse flux as a single power law flux (SPL) with a best-fit spectral index of ϒ = 2.58-0.09+0.10 and per-flavor normalization of ΦAstroper-flavor = 1.68-0.22+0.19 x 10-18 x GeV-1cm-2s-1sr-1 (at 100 TeV). The sensitive energy range for this dataset is 3-550 TeV under the SPL assumption. This data was also used to measure the flux under a broken power law, however we did not find any evidence of a low energy cutoff.

Place, publisher, year, edition, pages
American Physical Society, 2024. Vol. 110, no 2, article id 022001
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-542239DOI: 10.1103/PhysRevD.110.022001ISI: 001280074200001OAI: oai:DiVA.org:uu-542239DiVA, id: diva2:1915070
Funder
German Research Foundation (DFG)Swedish Research CouncilSwedish National Infrastructure for Computing (SNIC)Knut and Alice Wallenberg FoundationAustralian Research CouncilSwedish Polar Research Secretariat
Note

For complete list of authors see http://dx.doi.org/10.1103/PhysRevD.110.022001

Available from: 2024-11-21 Created: 2024-11-21 Last updated: 2024-11-21Bibliographically approved

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Beise, JakobBotner, OlgaColeman, AlanGlaser, ChristianGlüsenkamp, ThorstenHallgren, AllanHeyer, NilsO'Sullivan, ErinPérez de los Heros, CarlosPontén, AxelValtonen-Mattila, Nora

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Beise, JakobBotner, OlgaColeman, AlanGlaser, ChristianGlüsenkamp, ThorstenHallgren, AllanHeyer, NilsO'Sullivan, ErinPérez de los Heros, CarlosPontén, AxelValtonen-Mattila, Nora
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High Energy Physics
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Physical Review D: covering particles, fields, gravitation, and cosmology
Astronomy, Astrophysics and Cosmology

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