IceCube high-energy starting event sample: Description and flux characterization with 7.5 years of data
Name
PhysRevD.104.022002.pdf
Description
Published version
Size
4.03 MB
Format
Adobe PDF
Checksum (MD5)
3b181c0386b847eaf47c4c5e6fc62cd3
Author(s)
Conrad, Janet
Date Issued
2021
Journal
Physical Review D
Publisher
American Physical Society (APS)
Citation
Conrad, Janet. 2021. "IceCube high-energy starting event sample: Description and flux characterization with 7.5 years of data." Physical Review D, 104 (2).
Version
Final published version
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, or 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 $\nu_e:\nu_\mu:\nu_\tau=1:1:1$, 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
${2.87}^{+0.20}_{-0.19}$ for the $68.3\%$ confidence interval.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PHYSREVD.104.022002
