Abstract
The far detector analysis for ν μ disappearance in the KEK to Kamioka (K2K) long-baseline neutrino oscillation experiment is presented. The data used for this analysis is 8.9 × 10 19 protons on target (POT). A total of 107 events are observed in the far detector, Super-Kamiokande (SK), while 151 −10 +12 are expected without ν μ oscillation. Spectral distortion of the reconstructed neutrino energy (E ν ) is also observed, and it is consistent with ν μ − ν τ oscillation. The two-flavor ν μ − ν τ oscillation analysis is evaluated. We obtain an allowed region which is consistent with SK atmospheric neutrino oscillation analysis results. The probability to observe our results from a statistical fluctuation is 0.005% (4.0 σ ) in the case of no oscillation.
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