K2K Experiment

Physics – High Energy Physics

Scientific paper

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Scientific paper

Evidence of muon neutrino oscillation with an accelerator-based experiment is reported. Data corresponding to 8.91 × 1019 p.o.t.. were used for the analysis. There were 108 events fully contained in the Super-Kamiokande inner detector fiducial area, which were synchronized to the beam-spill timing. In the case of no oscillations, the expected number of events was 150.9-10.0+11.6. Out of the 108 events, we obtained 56 events of single ring μ-like events. The neutrino energy spectrum, reconstructed by assuming two-body kinematics of quasi-elastic interactions, shows a clear oscillation pattern compared with the spectrum at the production observed by the near detectors. These two facts strongly indicate neutrino oscillation with common oscillation parameter regions. A combined oscillation analysis gives Δm2 = 1.7 3.5 × 10-3eV2 at sin22θ=1.0 at the 90% confidence level, and the null oscillation probability is found to be less than 0.01%.

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