IceCube high-energy starting event sample: Description and flux characterization with 7.5 years of data

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  • R. Abbasi
  • M. Ackermann
  • J. Adams
  • J. A. Aguilar
  • Ahlers, Markus Tobias
  • M. Ahrens
  • C. Alispach
  • A. A. Alves
  • N. M. Amin
  • K. Andeen
  • T. Anderson
  • I Ansseau
  • G. Anton
  • C. Arguelles
  • S. Axani
  • X. Bai
  • A. Balagopal
  • A. Barbano
  • S. W. Barwick
  • B. Bastian
  • Alakananda Basu
  • Oliver Baum
  • S. Baur
  • R. Bay
  • J. J. Beatty
  • K-H Becker
  • J. Becker Tjus
  • C. Bellenghi
  • S. BenZvi
  • D. Berley
  • E. Bernardini
  • D. Z. Besson
  • G. Binder
  • D. Bindig
  • E. Blaufuss
  • S. Blot
  • S. Boeser
  • O. Botner
  • J. Boettcher
  • E. Bourbeau
  • J. Bourbeau
  • F. Bradascio
  • J. Braun
  • S. Bron
  • J. Brostean-Kaiser
  • A. Burgman
  • R. S. Busse
  • D. J. Koskinen
  • M. Rameez
  • Stuttard, Thomas Simon
  • Icecube Collaboration

The IceCube Neutrino Observatory has established the existence of a high-energy all-sky neutrino flux of astrophysical origin. This discovery was made using events interacting within a fiducial region of the detector surrounded by an active veto and with reconstructed energy above 60 TeV, commonly known as the high-energy starting event sample (HESE). We revisit the analysis of the HESE sample with an additional 4.5 years of data, newer glacial ice models, and improved systematics treatment. This paper describes the sample in detail, reports on the latest astrophysical neutrino flux measurements, and presents a source search for astrophysical neutrinos. We give the compatibility of these observations with specific isotropic flux models proposed in the literature as well as generic power-law-like scenarios. Assuming v(e): v(mu): v(tau) = 1:1:1, and an equal flux of neutrinos and antineutrinos, we find that the astrophysical neutrino spectrum is compatible with an unbroken power law, with a preferred spectral index of 2.87(-0.19)(+0.20) for the 68% confidence interval.

Original languageEnglish
Article number022002
JournalPhysical Review D
Issue number2
Number of pages56
Publication statusPublished - 8 Jul 2021

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