New results from the K2K experiment

Research output: Contribution to journalArticlepeer-review


The K2K long-baseline neutrino oscillation experiment has analyzed all data including the period ending in February 2004. The total data sample is from 8.9 × 1019 protons on target. We observe 108 events at the far detector, Super-Kamiokande, when 150.9 +11.6 -10.0 were expected. Further, we observe a distortion of the neutrino energy spectrum which is consistent with νμ to ντ oscillation. The probability that we would observe these results if there is no neutrino oscillation is 0.011%, a 3.9 σ significance.

Original languageEnglish (US)
Pages (from-to)3055-3058
Number of pages4
JournalInternational Journal of Modern Physics A
Issue number14
StatePublished - Jun 10 2005


  • Long-baseline
  • Neutrino
  • Neutrino oscillation

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