Indication of Electron Neutrino Appearance from an Accelerator-Produced Off-Axis Muon Neutrino Beam

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Abe, K, Abgrall, N, Ajima, Y, Aihara, H, Albert, JB, Andreopoulos, C ORCID: 0000-0003-2020-8215, Andrieu, B, Aoki, S, Araoka, O, Argyriades, J et al (show 401 more authors) , Ariga, A, Ariga, T, Assylbekov, S, Autiero, D, Badertscher, A, Barbi, M, Barker, GJ, Barr, G, Bass, 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, Calvet, D, Cartwright, SL, Carver, A, Castillo, R, Catanesi, MG, Cazes, A, Cervera, A, Chavez, C, Choi, S, Christodoulou, G, Coleman, J ORCID: 0000-0003-1319-0889, Coleman, W, Collazuol, G, Connolly, K, Curioni, A, Dabrowska, A, Danko, I, Das, R, Davies, GS, Davis, S, Day, M, De Rosa, G, de Andre, JPAM, de Perio, P, Delbart, A, Densham, C, Di Lodovico, F, Di Luise, S, Tran, P Dinh, Dobson, J, Dore, U, Drapier, O, Dufour, F, Dumarchez, J, Dytman, S, Dziewiecki, M, Dziomba, M, Emery, S, Ereditato, A, Escudero, L, Esposito, LS, Fechner, M, Ferrero, A, Finch, AJ, Frank, E, Fujii, Y, Fukuda, Y, Galymov, V, Gannaway, FC, Gaudin, A, Gendotti, A, George, MA, Giffin, S, Giganti, C, Gilje, K, Golan, T, Goldhaber, M, Gomez-Cadenas, JJ, Gonin, M, Grant, N, Grant, A, Gumplinger, P, Guzowski, P, Haesler, A, Haigh, MD, Hamano, K, Hansen, C, Hansen, D, Hara, T, Harrison, PF, Hartfiel, B, Hartz, M, Haruyama, T, Hasegawa, T, Hastings, NC, Hastings, S, Hatzikoutelis, A, Hayashi, K, Hayato, Y, Hearty, C, Helmer, RL, Henderson, R, Higashi, N, Hignight, J, Hirose, E, Holeczek, J, Horikawa, S, Hyndman, A, Ichikawa, AK, Ieki, K, Ieva, M, Iida, M, Ikeda, M, Ilic, J, Imber, J, Ishida, T, Ishihara, C, Ishii, T, Ives, SJ, Iwasaki, M, Iyogi, K, Izmaylov, A, Jamieson, B, Johnson, RA, Joo, KK, Jover-Manas, GV, Jung, CK, Kaji, H, Kajita, T, Kakuno, H, Kameda, J, Kaneyuki, K, Karlen, D, Kasami, K, Kato, I, Kearns, E, Khabibullin, M, Khanam, F, Khotjantsev, A, Kielczewska, D, Kikawa, T, Kim, J, Kim, JY, Kim, SB, Kimura, N, Kirby, B, Kisiel, J, Kitching, P, Kobayashi, T, Kogan, G, Koike, S, Konaka, A, Kormos, LL, Korzenev, A, Koseki, K, Koshio, Y, Kouzuma, Y, Kowalik, K, Kravtsov, V, Kreslo, I, Kropp, W, Kubo, H, Kudenko, Y, Kulkarni, N, Kurjata, R, Kutter, T, Lagoda, J, Laihem, K, Laveder, M, Lee, KP, Le, PT, Levy, JM, Licciardi, C, Lim, IT, Lindner, T, Litchfield, RP, Litos, M, Longhin, A, Lopez, GD, Loverre, PF, Ludovici, L, Lux, T, Macaire, M, Mahn, K, Makida, Y, Malek, M, Manly, S, Marchionni, A, Marino, AD, Marteau, J, Martin, JF, Maruyama, T, Maryon, T, Marzec, J, Masliah, P, Mathie, EL, Matsumura, C, Matsuoka, K, Matveev, V, Mavrokoridis, K ORCID: 0000-0002-9244-4519, Mazzucato, E, McCauley, N ORCID: 0000-0002-5982-5125, McFarland, KS, McGrew, C, McLachlan, T, Messina, M, Metcalf, W, Metelko, C, Mezzetto, M, Mijakowski, P, Miller, CA, Minamino, A, Mineev, O, Mine, S, Missert, AD, Mituka, G, Miura, M, Mizouchi, K, Monfregola, L, Moreau, F, Morgan, B, Moriyama, S, Muir, A, Murakami, A, Murdoch, M, Murphy, S, Myslik, J, Nakadaira, T, Nakahata, M, Nakai, T, Nakajima, K, Nakamoto, T, Nakamura, K, Nakayama, S, Nakaya, T, Naples, D, Navin, ML, Nelson, B, Nicholls, TC, Nishikawa, K, Nishino, H, Nowak, JA, Noy, M, Obayashi, Y, Ogitsu, T, Ohhata, H, Okamura, T, Okumura, K, Okusawa, T, Oser, SM, Otani, M, Owen, RA, Oyama, Y, Ozaki, T, Pac, MY, Palladino, V, Paolone, V, Paul, P, Payne, D ORCID: 0000-0002-8520-5210, Pearce, GF, Perkin, JD, Pettinacci, V, Pierre, F, Poplawska, E, Popov, B, Posiadala, M, Poutissou, J-M, Poutissou, R, Przewlocki, P, Qian, W, Raaf, JL, Radicioni, E, Ratoff, PN, Raufer, TM, Ravonel, M, Raymond, M, Retiere, F, Robert, A, Rodrigues, PA, Rondio, E, Roney, JM, Rossi, B, Roth, S, Rubbia, A, Ruterbories, D, Sabouri, S, Sacco, R, Sakashita, K, Sanchez, F, Sarrat, A, Sasaki, K, Scholberg, K, Schwehr, J, Scott, M, Scully, DI, Seiya, Y, Sekiguchi, T, Sekiya, H, Shibata, M, Shimizu, Y, Shiozawa, M, Short, S, Siyad, M, Smith, RJ, Smy, M, Sobczyk, JT, Sobel, H, Sorel, M, Stahl, A, Stamoulis, P, Steinmann, J, Still, B, Stone, J, Strabel, C, Sulak, LR, Sulej, R, Sutcliffe, P, Suzuki, A, Suzuki, K, Suzuki, S, Suzuki, SY, Suzuki, Y, Suzuki, Y, Szeglowski, T, Szeptycka, M, Tacik, R, Tada, M, Takahashi, S, Takeda, A, Takenaga, Y, Takeuchi, Y, Tanaka, K, Tanaka, HA, Tanaka, M, Tanaka, MM, Tanimoto, N, Tashiro, K, Taylor, I, Terashima, A, Terhorst, D, Terri, R, Thompson, LF, Thorley, A, Toki, W, Tomaru, T, Totsuka, Y, Touramanis, C ORCID: 0000-0001-5191-2171, Tsukamoto, T, Tzanov, M, Uchida, Y, Ueno, K, Vacheret, A, Vagins, M, Vasseur, G, Wachala, T, Walding, JJ, Waldron, AV, Walter, CW, Wanderer, PJ, Wang, J, Ward, MA, Ward, GP, Wark, D, Wascko, MO, Weber, A, Wendell, R, West, N, Whitehead, LH, Wikstroem, G, Wilkes, RJ, Wilking, MJ, Wilson, JR, Wilson, RJ, Wongjirad, T, Yamada, S, Yamada, Y, Yamamoto, A, Yamamoto, K, Yamanoi, Y, Yamaoka, H, Yanagisawa, C, Yano, T, Yen, S, Yershov, N, Yokoyama, M, Zalewska, A, Zalipska, J, Zambelli, L, Zaremba, K, Ziembicki, M, Zimmerman, ED, Zito, M and Zmuda, J (2011) Indication of Electron Neutrino Appearance from an Accelerator-Produced Off-Axis Muon Neutrino Beam PHYSICAL REVIEW LETTERS, 107 (4). 041801-. ISSN 0031-9007, 1079-7114

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Abstract

The T2K experiment observes indications of ν<inf>μ</inf>→ν <inf>e</inf> appearance in data accumulated with 1.43×1020 protons on target. Six events pass all selection criteria at the far detector. In a three-flavor neutrino oscillation scenario with |Δm232|=2.4×10⊃- 3eV2, ⊃sin⊃ 22θ<inf>23</inf>=1 and ⊃sin⊃ 22θ<inf>13</inf>=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⊃ 22θ<inf>13</inf><0.28(0.34) for δ<inf>CP</inf>= 0 and a normal (inverted) hierarchy.

Item Type:	Article
Additional Information:	20 pages, 6 figures, version published in PRL
Uncontrolled Keywords:	T2K Collaboration
Depositing User:	Symplectic Admin
Date Deposited:	08 Apr 2016 14:48
Last Modified:	24 Jun 2026 12:14
DOI:	10.1103/PhysRevLett.107.041801
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3000086
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