Astrophysical neutrino results
Thomas K. Gaisser (for the IceCube Collaboration)
TL;DR
This paper reviews the current status of high-energy astrophysical neutrino searches, highlighting how recent limits challenge models of extragalactic cosmic ray origins and discussing background uncertainties.
Contribution
It provides a concise overview of the experimental limits on astrophysical neutrinos and discusses systematic uncertainties affecting the interpretation of results.
Findings
Current limits are constraining models of extragalactic cosmic rays
Atmospheric neutrino background uncertainties impact search sensitivity
No definitive detection of astrophysical neutrinos yet
Abstract
This paper is a brief review of the status of the search for astrophysical neutrinos of high energy. Its emphasis is on the search for a hard spectrum of neutrinos from the whole Northern sky above the steeply falling background of atmospheric neutrinos. Current limits are so low that they are beginning to constrain models of the origin of extragalactic cosmic rays. Systematic effects stemming from incomplete knowledge of the background of atmospheric neutrinos are discussed.
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