First muon-neutrino disappearance study with an off-axis beam


Journal Article

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.

Full Text

Duke Authors

Cited Authors

  • Abe, K; Abgrall, N; Ajima, Y; Aihara, H; Albert, JB; Andreopoulos, C; Andrieu, B; Anerella, MD; Aoki, S; Araoka, O; Argyriades, J; Ariga, A; Ariga, T; Assylbekov, S; Autiero, D; Badertscher, A; Barbi, M; Barker, GJ; Barr, G; Bass, M; Batkiewicz, M; Bay, F; Bentham, S; Berardi, V; Berger, BE; Bertram, I; Besnier, M; Beucher, J; Beznosko, D; Bhadra, S; Blaszczyk, FDMM; Blondel, A; Bojechko, C; Bouchez, J; Boyd, SB; Bravar, A; Bronner, C; Brook-Roberge, DG; Buchanan, N; Budd, H; Calland, RG; Calvet, D; Caravaca Rodríguez, J; Cartwright, SL; Carver, A; Castillo, R; Catanesi, MG; Cazes, A; Cervera, A; Chavez, C; Choi, S; Christodoulou, G; Coleman, J; Collazuol, G; Coleman, W; Connolly, K; Curioni, A; Dabrowska, A; Danko, I; Das, R; Davies, GS; Davis, S; Day, M; De Rosa, G; De André, JPAM; De Perio, P; Dealtry, T; Delbart, A; Densham, C; Di Lodovico, F; Di Luise, S; Dinh Tran, P; Dobson, J; Dore, U; Drapier, O; Duboyski, T; Dufour, F; Dumarchez, J; Dytman, S; Dziewiecki, M; Dziomba, M; Emery, S; Ereditato, A; Escallier, JE; Escudero, L; Esposito, LS; Fechner, M; Ferrero, A; Finch, AJ; Frank, E; Fujii, Y; Fukuda, Y; Galymov, V; Ganetis, GL; Gannaway, FC; Gaudin, A; Gendotti, A; George, MA; Giffin, S; Giganti, C

Published Date

  • February 22, 2012

Published In

Volume / Issue

  • 85 / 3

Electronic International Standard Serial Number (EISSN)

  • 1550-2368

International Standard Serial Number (ISSN)

  • 1550-7998

Digital Object Identifier (DOI)

  • 10.1103/PhysRevD.85.031103

Citation Source

  • Scopus