A search for the appearance of tau neutrinos from ν_μ↔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±48(stat)_-32⁺¹⁵(syst) events is obtained with an expectation of 78±26(syst). The hypothesis of no tau neutrino appearance is disfavored by 2.4 sigma.
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Abe et al. (2006) studied this question.
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