IceCube high-energy starting event sample: Description and flux characterization with 7.5 years of data ICECUBE HIGH-ENERGY STARTING EVENT SAMPLE: ... ABBASI R. et al.

Authors

R. Abbasi, Loyola University of ChicagoFollow
M. Ackermann, Deutsches Elektronen-Synchrotron (DESY)Follow
J. Adams, University of CanterburyFollow
J. A. Aguilar, Université Libre de BruxellesFollow
M. Ahlers, Niels Bohr InstitutetFollow
M. Ahrens, Stockholms universitet
C. Alispach, Université de GenèveFollow
A. A. Alves, Karlsruher Institut für TechnologieFollow
N. M. Amin, The Bartol Research InstituteFollow
K. Andeen, Marquette UniversityFollow
T. Anderson, Eberly College of Science
I. Ansseau, Université Libre de Bruxelles
G. Anton, Friedrich-Alexander-Universität Erlangen-Nürnberg
C. Argüelles, Harvard University
S. Axani, Massachusetts Institute of Technology
X. Bai, South Dakota School of Mines & Technology
A. Balagopal V., University of Wisconsin-MadisonFollow
A. Barbano, Université de Genève
S. W. Barwick, University of California, Irvine
B. Bastian, Deutsches Elektronen-Synchrotron (DESY)
V. Basu, University of Wisconsin-Madison
V. Baum, Johannes Gutenberg-Universität Mainz
S. Baur, Université Libre de Bruxelles
R. Bay, University of California, Berkeley
J. J. Beatty, The Ohio State University

Document Type

Article

Publication Date

7-15-2021

Publication Title

Physical Review D

Volume

104

Issue

2

Abstract

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 νe:νμ:ντ=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.

Identifier

85110598861 (Scopus)

Recommended Citation

Abbasi, R.; Ackermann, M.; Adams, J.; Aguilar, J. A.; Ahlers, M.; Ahrens, M.; Alispach, C.; Alves, A. A.; Amin, N. M.; Andeen, K.; Anderson, T.; Ansseau, I.; Anton, G.; Argüelles, C.; Axani, S.; Bai, X.; Balagopal V., A.; Barbano, A.; Barwick, S. W.; Bastian, B.; Basu, V.; Baum, V.; Baur, S.; Bay, R.; and Beatty, J. J., "IceCube high-energy starting event sample: Description and flux characterization with 7.5 years of data ICECUBE HIGH-ENERGY STARTING EVENT SAMPLE: ... ABBASI R. et al." (2021). Physics: Faculty Publications and Other Works. 93.
https://ecommons.luc.edu/physics_facpubs/93