Evidence for muon neutrino oscillation in an accelerator-based experiment
K2K Collaboration: E. Aliu, et al
TL;DR
This paper reports evidence of muon neutrino oscillation observed in the K2K experiment, demonstrating energy-dependent disappearance consistent with neutrino flavor change, with high statistical significance.
Contribution
First experimental evidence of muon neutrino oscillation in an accelerator-based long-baseline experiment using the K2K setup.
Findings
Observed energy-dependent muon neutrino disappearance
Probability of no oscillation hypothesis is 0.0050%
Results support neutrino oscillation hypothesis with 4.0 sigma significance
Abstract
We present results for muon neutrino oscillation in the KEK to Kamioka (K2K) long-baseline neutrino oscillation experiment. K2K uses an accelerator-produced muon neutrino beam with a mean energy of 1.3 GeV directed at the Super-Kamiokande detector. We observed the energy dependent disappearance of muon neutrino, which we presume have oscillated to tau neutrino. The probability that we would observe these results if there is no neutrino oscillation is 0.0050% (4.0 sigma).
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