Evidence for muon neutrino oscillation in an accelerator-based experiment

E. Aliu, S. Andringa, S. Aoki, J. Argyriades, K. Asakura, R. Ashie, H. Berns, H. Bhang, A. Blondel, S. Borghi, J. Bouchez, J. Burguet-Castell, D. Casper, C. Cavata, A. Cervera, K. O. Cho, J. H. Choi, U. Dore, X. Espinal, M. FechnerE. Fernandez, Y. Fukuda, J. Gomez-Cadenas, R. Gran, T. Hara, M. Hasegawa, K. Hayashi, A. Ikeda, T. Ishii, C. O. Kim, S. Kim, K. Kobayashi, T. Kobayashi, T. Maruyama, T. Morita, K. Nakamura, S. Nakayama, K. Okumura, T. Sasaki, M. Sekiguchi, K. Shiraishi, A. Suzuki, Y. Suzuki, T. Takahashi, M. Tanaka, S. Ueda, S. Yamada, W. Wang, S. Yamamoto, M. Yoshida

Research output: Contribution to journalArticlepeer-review

414 Citations (Scopus)


We present results for νμ oscillation in the KEK to Kamioka (K2K) long-baseline neutrino oscillation experiment. K2K uses an accelerator-produced νμ beam with a mean energy of 1.3 GeV directed at the Super-Kamiokande detector. We observed the energy-dependent disappearance of vmu;, which we presume have oscillated to ντ. The probability that we would observe these results if there is no neutrino oscillation is 0.0050% (4.0σ).

Original languageEnglish
Article number081802
JournalPhysical review letters
Issue number8
Publication statusPublished - Mar 4 2005

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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