Observation of Seven Astrophysical Tau Neutrino Candidates with IceCube - INSPIRE

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Observation of Seven Astrophysical Tau Neutrino Candidates with IceCube

IceCube

Collaboration

Mar 4, 2024

9 pages

Published in:

Phys.Rev.Lett. 132 (2024) 15, 15

Published: Apr 11, 2024

e-Print:

2403.02516 [astro-ph.HE]

DOI:

10.1103/PhysRevLett.132.151001 (publication)

Experiments:

ICECUBE

View in:

ADS Abstract Service

reference search18 citations

Citations per year

Abstract: (APS)

We report on a measurement of astrophysical tau neutrinos with 9.7 yr 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

5 σ

level. The measured astrophysical

ν_{τ}

flux is consistent with expectations based on previously published IceCube astrophysical neutrino flux measurements and neutrino oscillations.

Note:

Accepted for publication in Physical Review Letters. This version includes full author list metadata

neutrino: flux
showers: atmosphere
neutrino: atmosphere
neutrino: oscillation
IceCube
background
TeV
muon
neutrino: VHE
air

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