Measurement of Atmospheric Neutrino Flux Consistent with Tau Neutrino Appearance

23 October 2006

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 97 (17) , 171801
https://doi.org/10.1103/physrevlett.97.171801

Abstract

A search for the appearance of tau neutrinos from

ν_{μ} \leftrightarrow ν_{τ}

oscillations in the atmospheric neutrinos has been performed using 1489.2 days of atmospheric neutrino data from the Super-Kamiokande-I experiment. A best fit tau neutrino appearance signal of

138 \pm 48 (stat)_{- 32}^{+ 15} (syst)

events is obtained with an expectation of

78 \pm 26 (syst)

. The hypothesis of no tau neutrino appearance is disfavored by 2.4 sigma.

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