Document Type
Article
Publication Date
2-22-2012
Abstract
We report a measurement of muon-neutrino disappearance in the T2K experiment. The 295-km muon-neutrino beam from Tokai to Kamioka is the first implementation of the off-axis technique in a long-baseline neutrino oscillation experiment. With data corresponding to 1.43×1020 protons on target, we observe 31 fully-contained single μ-like ring events in Super-Kamiokande, compared with an expectation of 104±14(syst) events without neutrino oscillations. The best-fit point for two-flavor ν μ→ν τ oscillations is sin2(2θ 23)=0.98 and |Δm322|=2.65×10 -3eV2. The boundary of the 90% confidence region includes the points ( sin2(2θ 23), |Δm322|)=(1.0,3.1×10 -3eV2), (0.84, 2.65×10 -3eV2) and (1.0, 2.2×10 -3eV2). © 2012 American Physical Society.
Publication Source (Journal or Book title)
Physical Review D - Particles, Fields, Gravitation and Cosmology
Recommended Citation
Abe, K., Abgrall, N., Ajima, Y., Aihara, H., Albert, J., Andreopoulos, C., Andrieu, B., Anerella, M., Aoki, S., Araoka, O., Argyriades, J., Ariga, A., Ariga, T., Assylbekov, S., Autiero, D., Badertscher, A., Barbi, M., Barker, G., Barr, G., Bass, M., Batkiewicz, M., Bay, F., Bentham, S., Berardi, V., Berger, B., Bertram, I., Besnier, M., & Beucher, J. (2012). First muon-neutrino disappearance study with an off-axis beam. Physical Review D - Particles, Fields, Gravitation and Cosmology, 85 (3) https://doi.org/10.1103/PhysRevD.85.031103
