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Evidence of electron neutrino appearance in a muon neutrino beam

  • Author(s): Abe, K
  • Abgrall, N
  • Aihara, H
  • Akiri, T
  • Albert, JB
  • Andreopoulos, C
  • Aoki, S
  • Ariga, A
  • Ariga, T
  • Assylbekov, S
  • Autiero, D
  • Barbi, M
  • Barker, GJ
  • Barr, G
  • Bass, M
  • Batkiewicz, M
  • Bay, F
  • Bentham, SW
  • Berardi, V
  • Berger, BE
  • Berkman, S
  • Bertram, I
  • Beznosko, D
  • Bhadra, S
  • Blaszczyk, FDM
  • Blondel, A
  • Bojechko, C
  • Boyd, S
  • Brailsford, D
  • Bravar, A
  • Bronner, C
  • Brook-Roberge, DG
  • Buchanan, N
  • Calland, RG
  • Caravaca Rodríguez, J
  • Cartwright, SL
  • Castillo, R
  • Catanesi, MG
  • Cervera, A
  • Cherdack, D
  • Christodoulou, G
  • Clifton, A
  • Coleman, J
  • Coleman, SJ
  • Collazuol, G
  • Connolly, K
  • Cremonesi, L
  • Curioni, A
  • Dabrowska, A
  • Danko, I
  • Das, R
  • Davis, S
  • Day, M
  • De André, JPAM
  • De Perio, P
  • De Rosa, G
  • Dealtry, T
  • Dennis, S
  • Densham, C
  • Di Lodovico, F
  • Di Luise, S
  • Dobson, J
  • Drapier, O
  • Duboyski, T
  • Dufour, F
  • Dumarchez, J
  • Dytman, S
  • Dziewiecki, M
  • Dziomba, M
  • Emery, S
  • Ereditato, A
  • Escudero, L
  • Finch, AJ
  • Frank, E
  • Friend, M
  • Fujii, Y
  • Fukuda, Y
  • Furmanski, A
  • Galymov, V
  • Gaudin, A
  • Giffin, S
  • Giganti, C
  • Gilje, K
  • Golan, T
  • Gomez-Cadenas, JJ
  • Gonin, M
  • Grant, N
  • Gudin, D
  • Hadley, DR
  • Haesler, A
  • Haigh, MD
  • Hamilton, P
  • Hansen, D
  • Hara, T
  • Hartz, M
  • Hasegawa, T
  • Hastings, NC
  • Hayato, Y
  • Hearty, C
  • Helmer, RL
  • et al.
Abstract

The T2K Collaboration reports evidence for electron neutrino appearance at the atmospheric mass splitting, |Δm322|≈2.4×10-3 eV2. An excess of electron neutrino interactions over background is observed from a muon neutrino beam with a peak energy of 0.6 GeV at the Super-Kamiokande (SK) detector 295 km from the beam's origin. Signal and background predictions are constrained by data from near detectors located 280 m from the neutrino production target. We observe 11 electron neutrino candidate events at the SK detector when a background of 3.3±0.4(syst) events is expected. The background-only hypothesis is rejected with a p value of 0.0009 (3.1σ), and a fit assuming νμ→νe oscillations with sinâ¡22θ23=1, δCP=0 and |Δm322|=2.4×10-3 eV2 yields sinâ¡22θ13=0.088-0.039+0. 049(stat+syst). © 2013 American Physical Society.

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