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Phys Rev Lett. 2011 Jul 22;107(4):041801. doi: 10.1103/PhysRevLett.107.041801. Epub 2011 Jul 18.

Indication of electron neutrino appearance from an accelerator-produced off-axis muon neutrino beam.

Physical review letters

K Abe, N Abgrall, Y Ajima, H Aihara, J B Albert, C Andreopoulos, B Andrieu, S Aoki, O Araoka, J Argyriades, A Ariga, T Ariga, S Assylbekov, D Autiero, A Badertscher, M Barbi, G J Barker, G Barr, M Bass, F Bay, S Bentham, V Berardi, B E Berger, I Bertram, M Besnier, J Beucher, D Beznosko, S Bhadra, F d M M Blaszczyk, A Blondel, C Bojechko, J Bouchez, S B Boyd, A Bravar, C Bronner, D G Brook-Roberge, N Buchanan, H Budd, D Calvet, S L Cartwright, A Carver, R Castillo, M G Catanesi, A Cazes, A Cervera, C Chavez, S Choi, G Christodoulou, J Coleman, W Coleman, G Collazuol, K Connolly, A Curioni, A Dabrowska, I Danko, R Das, G S Davies, S Davis, M Day, G De Rosa, J P A M de André, P de Perio, A Delbart, C Densham, F Di Lodovico, S Di Luise, P Dinh Tran, J Dobson, U Dore, O Drapier, F Dufour, J Dumarchez, S Dytman, M Dziewiecki, M Dziomba, S Emery, A Ereditato, L Escudero, L S Esposito, M Fechner, A Ferrero, A J Finch, E Frank, Y Fujii, Y Fukuda, V Galymov, F C Gannaway, A Gaudin, A Gendotti, M A George, S Giffin, C Giganti, K Gilje, T Golan, M Goldhaber, J J Gomez-Cadenas, M Gonin, N Grant, A Grant, P Gumplinger, P Guzowski, A Haesler, M D Haigh, K Hamano, C Hansen, D Hansen, T Hara, P F Harrison, B Hartfiel, M Hartz, T Haruyama, T Hasegawa, N C Hastings, S Hastings, A Hatzikoutelis, K Hayashi, Y Hayato, C Hearty, R L Helmer, R Henderson, N Higashi, J Hignight, E Hirose, J Holeczek, S Horikawa, A Hyndman, A K Ichikawa, K Ieki, M Ieva, M Iida, M Ikeda, J Ilic, J Imber, T Ishida, C Ishihara, T Ishii, S J Ives, M Iwasaki, K Iyogi, A Izmaylov, B Jamieson, R A Johnson, K K Joo, G V Jover-Manas, C K Jung, H Kaji, T Kajita, H Kakuno, J Kameda, K Kaneyuki, D Karlen, K Kasami, I Kato, E Kearns, M Khabibullin, F Khanam, A Khotjantsev, D Kielczewska, T Kikawa, J Kim, J Y Kim, S B Kim, N Kimura, B Kirby, J Kisiel, P Kitching, T Kobayashi, G Kogan, S Koike, A Konaka, L L Kormos, A Korzenev, K Koseki, Y Koshio, Y Kouzuma, K Kowalik, V Kravtsov, I Kreslo, W Kropp, H Kubo, Y Kudenko, N Kulkarni, R Kurjata, T Kutter, J Lagoda, K Laihem, M Laveder, K P Lee, P T Le, J M Levy, C Licciardi, I T Lim, T Lindner, R P Litchfield, M Litos, A Longhin, G D Lopez, P F Loverre, L Ludovici, T Lux, M Macaire, K Mahn, Y Makida, M Malek, S Manly, A Marchionni, A D Marino, J Marteau, J F Martin, T Maruyama, T Maryon, J Marzec, P Masliah, E L Mathie, C Matsumura, K Matsuoka, V Matveev, K Mavrokoridis, E Mazzucato, N McCauley, K S McFarland, C McGrew, T McLachlan, M Messina, W Metcalf, C Metelko, M Mezzetto, P Mijakowski, C A Miller, A Minamino, O Mineev, S Mine, A D Missert, G Mituka, M Miura, K Mizouchi, L Monfregola, F Moreau, B Morgan, S Moriyama, A Muir, A Murakami, M Murdoch, S Murphy, J Myslik, T Nakadaira, M Nakahata, T Nakai, K Nakajima, T Nakamoto, K Nakamura, S Nakayama, T Nakaya, D Naples, M L Navin, B Nelson, T C Nicholls, K Nishikawa, H Nishino, J A Nowak, M Noy, Y Obayashi, T Ogitsu, H Ohhata, T Okamura, K Okumura, T Okusawa, S M Oser, M Otani, R A Owen, Y Oyama, T Ozaki, M Y Pac, V Palladino, V Paolone, P Paul, D Payne, G F Pearce, J D Perkin, V Pettinacci, F Pierre, E Poplawska, B Popov, M Posiadala, J-M Poutissou, R Poutissou, P Przewlocki, W Qian, J L Raaf, E Radicioni, P N Ratoff, T M Raufer, M Ravonel, M Raymond, F Retiere, A Robert, P A Rodrigues, E Rondio, J M Roney, B Rossi, S Roth, A Rubbia, D Ruterbories, S Sabouri, R Sacco, K Sakashita, F Sánchez, A Sarrat, K Sasaki, K Scholberg, J Schwehr, M Scott, D I Scully, Y Seiya, T Sekiguchi, H Sekiya, M Shibata, Y Shimizu, M Shiozawa, S Short, M Siyad, R J Smith, M Smy, J T Sobczyk, H Sobel, M Sorel, A Stahl, P Stamoulis, J Steinmann, B Still, J Stone, C Strabel, L R Sulak, R Sulej, P Sutcliffe, A Suzuki, K Suzuki, S Suzuki, S Y Suzuki, Y Suzuki, Y Suzuki, T Szeglowski, M Szeptycka, R Tacik, M Tada, S Takahashi, A Takeda, Y Takenaga, Y Takeuchi, K Tanaka, H A Tanaka, M Tanaka, M M Tanaka, N Tanimoto, K Tashiro, I Taylor, A Terashima, D Terhorst, R Terri, L F Thompson, A Thorley, W Toki, T Tomaru, Y Totsuka, C Touramanis, T Tsukamoto, M Tzanov, Y Uchida, K Ueno, A Vacheret, M Vagins, G Vasseur, T Wachala, J J Walding, A V Waldron, C W Walter, P J Wanderer, J Wang, M A Ward, G P Ward, D Wark, M O Wascko, A Weber, R Wendell, N West, L H Whitehead, G Wikström, R J Wilkes, M J Wilking, J R Wilson, R J Wilson, T Wongjirad, S Yamada, Y Yamada, A Yamamoto, K Yamamoto, Y Yamanoi, H Yamaoka, C Yanagisawa, T Yano, S Yen, N Yershov, M Yokoyama, A Zalewska, J Zalipska, L Zambelli, K Zaremba, M Ziembicki, E D Zimmerman, M Zito, J Żmuda,

Affiliations

  1. University of Tokyo, Institute for Cosmic Ray Research, Kamioka Observatory, Kamioka, Japan.

PMID: 21866992 DOI: 10.1103/PhysRevLett.107.041801

Abstract

The T2K experiment observes indications of ν(μ) → ν(e) appearance in data accumulated with 1.43×10(20) protons on target. Six events pass all selection criteria at the far detector. In a three-flavor neutrino oscillation scenario with |Δm(23)(2)| = 2.4×10(-3)  eV(2), sin(2)2θ(23) = 1 and sin(2)2θ(13) = 0, the expected number of such events is 1.5±0.3(syst). Under this hypothesis, the probability to observe six or more candidate events is 7×10(-3), equivalent to 2.5σ significance. At 90% C.L., the data are consistent with 0.03(0.04) < sin(2)2θ(13) < 0.28(0.34) for δ(CP) = 0 and a normal (inverted) hierarchy.

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