Improved search for Ivμ→ve oscillation in a long-baseline accelerator experiment

S. Yamamoto, J. Zalipska, E. Aliu, S. Andringa, S. Aoki, J. Argyriades, K. Asakura, R. Ashie, F. Berghaus, H. Berns, H. Bhang, A. Blondel, S. Borghi, J. Bouchez, J. Burguet-Castell, D. Casper, J. Catala, C. Cavata, A. Cervera, S. M. ChenK. O. Cho, J. H. Choi, U. Dore, X. Espinal, M. Fechner, E. Fernandez, Y. Fukuda, J. Gomez-Cadenas, R. Gran, T. Hara, M. Hasegawa, T. Hasegawa, K. Hayashi, Y. Hayato, R. L. Helmer, K. Hiraide, J. Hosaka, A. K. Ichikawa, M. Iinuma, A. Ikeda, T. Inagaki, T. Ishida, K. Ishihara, T. Ishii, M. Ishitsuka, Y. Itow, T. Iwashita, H. I. Jang, E. J. Jeon, I. S. Jeong

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74 Scopus citations


We performed an improved search for a†'Îe oscillation with the KEK to Kamioka (K2K) long-baseline neutrino oscillation experiment, using the full data sample of 9.2ã-1019 protons on target. No evidence for a îe appearance signal was found, and we set bounds on the îa†Îe oscillation parameters. At Î"m2=2.8ã- 10-3eV2, the best-fit value of the K2K îÎdisappearance analysis, we set an upper limit of sina¡22iîe<0.13 at a 90% confidence level.

Original languageEnglish (US)
Article number181801
JournalPhysical review letters
Issue number18
StatePublished - 2006


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