Detection of astrophysical tau neutrino candidates in IceCube

R. Abbasi (Department of Physics, Loyola University Chicago, Chicago, IL, 60660, USA) ; M. Ackermann (DESY, Zeuthen, 15738, Germany) ; J. Adams (Department of Physics and Astronomy, University of Canterbury, Christchurch, New Zealand) ; J. Aguilar (Science Faculty CP230, Université Libre de Bruxelles, Brussels, 1050, Belgium) ; M. Ahlers (Niels Bohr Institute, University of Copenhagen, Copenhagen, 2100, Denmark) ; et al. - Show all 365 authors

High-energy tau neutrinos are rarely produced in atmospheric cosmic-ray showers or at cosmic particle accelerators, but are expected to emerge during neutrino propagation over cosmic distances due to flavor mixing. When high energy tau neutrinos interact inside the IceCube detector, two spatially separated energy depositions may be resolved, the first from the charged current interaction and the second from the tau lepton decay. We report a novel analysis of 7.5 years of IceCube data that identifies two candidate tau neutrinos among the 60 “High-Energy Starting Events” (HESE) collected during that period. The HESE sample offers high purity, all-sky sensitivity, and distinct observational signatures for each neutrino flavor, enabling a new measurement of the flavor composition. The measured astrophysical neutrino flavor composition is consistent with expectations, and an astrophysical tau neutrino flux is indicated at 2.8 $$\sigma $$ σ significance.

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    {
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        {
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          "value": "Department of Physics, TU Dortmund University, Dortmund, 44221, Germany", 
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        {
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    {
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        {
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    {
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    {
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        {
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          "value": "Department of Physics, Drexel University, 3141 Chestnut Street, Philadelphia, PA, 19104, USA", 
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    {
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        {
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    {
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        {
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    {
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        {
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    {
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          "value": "Department of Physics, Pennsylvania State University, University Park, PA, 16802, USA", 
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    {
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          "value": "Institute of Physics, University of Mainz, Staudinger Weg 7, Mainz, 55099, Germany", 
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    {
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        {
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  "titles": [
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      "source": "Springer", 
      "title": "Detection of astrophysical tau neutrino candidates in IceCube"
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  "abstracts": [
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      "source": "Springer", 
      "value": "High-energy tau neutrinos are rarely produced in atmospheric cosmic-ray showers or at cosmic particle accelerators, but are expected to emerge during neutrino propagation over cosmic distances due to flavor mixing. When high energy tau neutrinos interact inside the IceCube detector, two spatially separated energy depositions may be resolved, the first from the charged current interaction and the second from the tau lepton decay. We report a novel analysis of 7.5 years of IceCube data that identifies two candidate tau neutrinos among the 60 \u201cHigh-Energy Starting Events\u201d (HESE) collected during that period. The HESE sample offers high purity, all-sky sensitivity, and distinct observational signatures for each neutrino flavor, enabling a new measurement of the flavor composition. The measured astrophysical neutrino flavor composition is consistent with expectations, and an astrophysical tau neutrino flux is indicated at 2.8 $$\\sigma $$  <math> <mi>\u03c3</mi> </math>   significance."
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Published on:
15 November 2022
Publisher:
Springer
Published in:
European Physical Journal C , Volume 82 (2022)
Issue 11
Pages 1-15
DOI:
https://doi.org/10.1140/epjc/s10052-022-10795-y
Copyrights:
The Author(s)
Licence:
CC-BY-4.0

Fulltext files: