Observation of Seven Astrophysical Tau Neutrino Candidates with IceCube
astro-ph.HE
/ Authors
IceCube Collaboration, R. Abbasi, M. Ackermann, J. Adams, S. K. Agarwalla, J. A. Aguilar, M. Ahlers, J. M. Alameddine, N. M. Amin, K. Andeen
and 395 more authors
G. Anton, C. Argüelles, Y. Ashida, S. Athanasiadou, S. N. Axani, X. Bai, A. Balagopal V., M. Baricevic, S. W. Barwick, V. Basu, R. Bay, J. J. Beatty, J. Becker Tjus, J. Beise, C. Bellenghi, C. Benning, S. BenZvi, D. Berley, E. Bernardini, D. Z. Besson, E. Blaufuss, S. Blot, F. Bontempo, J. Y. Book
/ Abstract
We report on a measurement of astrophysical tau neutrinos with 9.7 years of IceCube data. Using convolutional neural networks trained on images derived from simulated events, seven candidate $ν_τ$ events were found with visible energies ranging from roughly 20 TeV to 1 PeV and a median expected parent $ν_τ$ energy of about 200 TeV. Considering backgrounds from astrophysical and atmospheric neutrinos, and muons from $π^\pm/K^\pm$ decays in atmospheric air showers, we obtain a total estimated background of about 0.5 events, dominated by non-$ν_τ$ astrophysical neutrinos. Thus, we rule out the absence of astrophysical $ν_τ$ at the $5σ$ level. The measured astrophysical $ν_τ$ flux is consistent with expectations based on previously published IceCube astrophysical neutrino flux measurements and neutrino oscillations.