A Measurement of Atmospheric Neutrino Flux Consistent with Tau Neutrino Appearance
Abstract
A search for the appearance of tau neutrinos from μtau 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 48 (stat.) +15-32 (sys.) events is obtained with an expectation of 78 26 (sys.). The hypothesis of no tau neutrino appearance is disfavored by 2.4 sigma.
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