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Updated directions of IceCube HESE events with the latest ice model using DirectFit

IceCube; Abbasi, Rasha; Ackermann, Markus; Adams, Jenni; Agarwalla, Sanjib; Aguilar, Juanan; Ahlers, Markus; Alameddine, Jean-Marco; Amin, Najia Moureen Binte ORCID iD icon; Andeen, Karen; Anton, Gisela; Arguelles, Carlos; Ashida, Yosuke; Athanasiadou, Sofia; Axani, Spencer; Bai, Xinhua; Balagopal V, Aswathi; Baricevic, Moreno; Barwick, Steve; ... mehr

Abstract:

The initial evidence of astrophysical neutrinos by the IceCube Neutrino Observatory stemmed from the high-energy starting events (HESE) sample: a selection of the highest-energy neutrino interactions that occurred within the detector fiducial volume. Each event was reconstructed based on our best knowledge of the ice at the time, with the latest results published in a description of the sample using 7.5 years of data. Since then, several major improvements in ice modeling have occurred using in-situ calibration data. These include a microscopic description of ice anisotropy arising from ice crystal birefringence and a more complete mapping of the ice layer undulations across the detector. The improvements feed into more accurate descriptions of individual events, and can especially affect the directional reconstruction of particle showers. Here, we apply the latest ice model in an exact manner to reconstruct IceCube’s high-energy events using DirectFit. This reconstruction samples posterior distributions across parameters of interest by performing full event resimulation and photon propagation at each step. We obtain improved per-event descriptions, as well as updates on previously published source searches using the aggregated sample.


Verlagsausgabe §
DOI: 10.5445/IR/1000163400
Veröffentlicht am 26.10.2023
Originalveröffentlichung
DOI: 10.22323/1.444.1030
Dimensions
Zitationen: 4
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Astroteilchenphysik (IAP)
Publikationstyp Proceedingsbeitrag
Publikationsdatum 25.07.2023
Sprache Englisch
Identifikator ISSN: 1824-8039
KITopen-ID: 1000163400
HGF-Programm 51.13.04 (POF IV, LK 01) Kosmische Strahlung Technologien
Erschienen in 38th International Cosmic Ray Conference (ICRC2023) - Neutrino Astronomy & Physics (NU)
Veranstaltung 38th International Cosmic Ray Conference (ICRC 2023), Nagoya, Japan, 26.07.2023 – 03.08.2023
Verlag Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Seiten Art.-Nr.: 1030
Serie Proceedings of Science ; 444
Nachgewiesen in Dimensions
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