Evidence of electron neutrino appearance in a muon neutrino beam

Abe, K; Abgrall, N; Aihara, H; Akiri, T; Albert, J. B.; Andreopoulos, C; Aoki, S; Ariga, A; Ariga, T; Assylbekov, S; Autiero, D; Barbi, M; Barker, G. J.; Barr, G; Bass, M; Batkiewicz, M; Bay, F; Bentham, S. W.; Berardi, Vincenzo; Berger, B. E.; Berkman, S; Bertram, I; Beznosko, D; Bhadra, S; Blaszczyk, F. D. M.; Blondel, A; Bojechko, C; Boyd, S; Brailsford, D; Bravar, A; Bronner, C; Brook Roberge, D. G.; Buchanan, N; Calland, R. G.; Caravaca, Rodriguez J.; Cartwright, S. L.; Castillo, R; Catanesi, M. G.; Cervera, A; Cherdack, D; Christodoulou, G; Clifton, A; Coleman, J; Coleman, S. J.; Collazuol, G; Connolly, K; Cremonesi, L; Curioni, A; Dabrowska, A; Danko, I; Das, R; Davis, S; Day, M; de Andre, J. P. A. M.; de Perio, P; De Rosa, G; Dealtry T., 45; Dennis S., 54; 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, A. J.; Frank, E; Friend, M; Fujii, Y; Fukuda, Y; Furmanski, A; Galymov, V; Gaudin, A; Giffin, S; Giganti, C; Gilje, K; Golan, T; Gomez Cadenas, J. J.; Gonin, M; Grant, N; Gudin, D; Hadley, D. R.; Haesler, A; Haigh, M. D.; Hamilton, P; Hansen, D; Hara, T; Hartz M., 58; Hasegawa, T; Hastings, N. C.; Hayato, Y; Hearty, C; Helmer, R. L.; Hierholzer, M; Hignight, J; Hillairet, A; Himmel, A; Hiraki, T; Hirota, S; Holeczek, J; Horikawa, S; Huang, K; Ichikawa, A. K.; Ieki, K; Ieva, M; Ikeda, M; Imber, J; Insler, J; Irvine, T. J.; Ishida, T; Ishii, T; Ives, S. J.; Iyogi, K; Izmaylov A., 24; Jacob, A; Jamieson, B; Johnson, R. A.; J. H., Jo; Jonsson, P; Joo, K. K.; Jung, C. K.; Kaboth, A; Kaji, H; Kajita, T; Kakuno, H; Kameda, J; Kanazawa, Y; Karlen D., 51; Karpikov, I; Kearns, E; Khabibullin, M; Khanam, F; Khotjantsev, A; Kielczewska, D; Kikawa, T; Kilinski, A; Kim, J. Y.; Kim, J; Kim, S. B.; Kirby, B; Kisiel, J; Kitching, P; Kobayashi, T; Kogan, G; Kolaceke, A; Konaka, A; Kormos, L. L.; Korzenev, A; Koseki, K; Koshio, Y; Kowalik, K; Kreslo, I; Kropp, W; Kubo, H; Kudenko, Y; Kumaratunga, S; Kurjata, R; Kutter, T; Lagoda, J; Laihem, K; Laing, A; Laveder, M; Lawe, M; Lazos, M; Lee, K. P.; Licciardi, C; Lim, I. T.; Lindner, T; Lister, C; Litchfield R. P., 54; Longhin, A; Lopez, G. D.; Ludovici, L; Macaire, M; Magaletti, Lorenzo; Mahn, K; Malek, M; Manly, S; Marchionni, A; Marino, A. D.; Marteau, J; Martin, J. F.; Maruyama, T; Marzec, J; Masliah, P; Mathie, E. L.; Matveev, V; Mavrokoridis, K; Mazzucato, E; Mccauley, N; Mcfarland, K. S.; Mcgrew, C; Mclachlan, T; Messina, M; Metelko, C; Mezzetto, M; Mijakowski, P; Miller, C. A.; Minamino, A; Mineev, O; Mine, S; Missert, A; Miura, M; Monfregola, L; Moriyama, S; Mueller Th, A; Murakami, A; Murdoch, M; Murphy S., 13; Myslik, J; Nagasaki, T; Nakadaira, T; Nakahata, M; Nakai, T; Nakajima, K; Nakamura, K; Nakayama, S; Nakaya, T; Nakayoshi, K; Naples, D; Nicholls, T. C.; Nielsen, C; Nirkko, M; Nishikawa, K; Nishimura, Y; O'Keeffe, H. M.; Obayashi, Y; Ohta, R; Okumura, K; Okusawa, T; Oryszczak, W; Oser, S. M.; Otani, M; Owen, R. A.; Oyama, Y; Pac, M. Y.; Palladino, V; Paolone, V; Payne, D; Pearce, G. F.; Perevozchikov, O; Perkin, J. D.; Petrov, Y; Pinzon, Guerra E. S.; Plonski, P; Poplawska, E; Popov, B; Posiadala, M; Poutissou, J. M.; Poutissou, R; Przewlocki, P; Quilain, B; Radicioni, E; Ratoff, P. N.; Ravonel, M; Rayner, M. A. M.; Reeves, M; Reinherz Aronis, E; Retiere, F; Robert, A; Rodrigues, P. A.; Rondio, E; Roth, S; Rubbia, A; Ruterbories, D; Sacco, R; Sakashita, K; Sanchez, F; Scantamburlo, E; Scholberg, K; Schwehr, J; Scott, M; Scully, D. I.; Seiya, Y; Sekiguchi, T; Sekiya, H; Sgalaberna, D; Shibata, M; Shiozawa, M; Short, S; Shustrov, Y; Sinclair, P; Smith, B; Smith, R. J.; Smy, M; Sobczyk, J. T.; Sobel, H; Sorel, M; Southwell, L; Stamoulis, P; Steinmann, J; Still, B; Suzuki, A; Suzuki, K; Suzuki, S. Y.; Suzuki, Y; Szeglowski, T; Szeptycka, M; Tacik R., 39; Tada, M; Takahashi, S; Takeda, A; Takeuchi, Y; Tanaka, H. A.; Tanaka, M. M.; Tanaka, M; Taylor, I. J.; Terhorst, D; Terri, R; Thompson, L. F.; Thorley, A; Tobayama, S; Toki, W; Tomura, T; Totsuka, Y; Touramanis, C; Tsukamoto, T; Tzanov, M; Uchida, Y; Ueno, K; Vacheret, A; Vagins, M; Vasseur, G; Wachala, T; Waldron, A. V.; Walter, C. W.; Wark D., 45; Wascko, M. O.; Weber A., 45; Wendell, R; Wilkes, R. J.; Wilking, M. J.; Wilkinson, C; Williamson, Z; Wilson, J. R.; Wilson, R. J.; Wongjirad, T; Yamada, Y; Yamamoto, K; Yanagisawa, C; Yen, S; Yershov, N; Yokoyama, M; Yuan, T; Zalewska, A; Zambelli, L; Zaremba, K; Ziembicki, M; Zimmerman, E. D.; Zito, M; Zmuda, J.

doi:10.1103/PhysRevD.88.032002

The T2K Collaboration reports evidence for electron neutrino appearance at the atmospheric mass splitting, vertical bar Delta m(32)(2)vertical bar approximate to 2.4 X 10(-3) eV(2). 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 (3.1 sigma), and a fit assuming nu(mu) -> nu(e) oscillations with sin (2)2 theta(23) = 1, delta(CP) = 0 and vertical bar Delta m(32)(2)vertical bar = 2.4 X 10(-3) eV(2) yields sin (2)2 theta(13) = 0.088(-0.039)(+0.049)(stat + syst).

Evidence of electron neutrino appearance in a muon neutrino beam / Abe, K; Abgrall, N; Aihara, H; Akiri, T; Albert, J. B.; Andreopoulos, C; Aoki, S; Ariga, A; Ariga, T; Assylbekov, S; Autiero, D; Barbi, M; Barker, G. J.; Barr, G; Bass, M; Batkiewicz, M; Bay, F; Bentham, S. W.; Berardi, Vincenzo; Berger, B. E.; Berkman, S; Bertram, I; Beznosko, D; Bhadra, S; Blaszczyk, F. D. M.; Blondel, A; Bojechko, C; Boyd, S; Brailsford, D; Bravar, A; Bronner, C; Brook Roberge, D. G.; Buchanan, N; Calland, R. G.; Rodriguez J., Caravaca; Cartwright, S. L.; Castillo, R; Catanesi, M. G.; Cervera, A; Cherdack, D; Christodoulou, G; Clifton, A; Coleman, J; Coleman, S. J.; Collazuol, G; Connolly, K; Cremonesi, L; Curioni, A; Dabrowska, A; Danko, I; Das, R; Davis, S; Day, M; de Andre, J. P. A. M.; de Perio, P; De Rosa, G; Dealtry T., 45; Dennis S., 54; 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, A. J.; Frank, E; Friend, M; Fujii, Y; Fukuda, Y; Furmanski, A; Galymov, V; Gaudin, A; Giffin, S; Giganti, C; Gilje, K; Golan, T; Gomez Cadenas, J. J.; Gonin, M; Grant, N; Gudin, D; Hadley, D. R.; Haesler, A; Haigh, M. D.; Hamilton, P; Hansen, D; Hara, T; Hartz M., 58; Hasegawa, T; Hastings, N. C.; Hayato, Y; Hearty, C; Helmer, R. L.; Hierholzer, M; Hignight, J; Hillairet, A; Himmel, A; Hiraki, T; Hirota, S; Holeczek, J; Horikawa, S; Huang, K; Ichikawa, A. K.; Ieki, K; Ieva, M; Ikeda, M; Imber, J; Insler, J; Irvine, T. J.; Ishida, T; Ishii, T; Ives, S. J.; Iyogi, K; Izmaylov A., 24; Jacob, A; Jamieson, B; Johnson, R. A.; Jo, J. H.; Jonsson, P; Joo, K. K.; Jung, C. K.; Kaboth, A; Kaji, H; Kajita, T; Kakuno, H; Kameda, J; Kanazawa, Y; Karlen D., 51; Karpikov, I; Kearns, E; Khabibullin, M; Khanam, F; Khotjantsev, A; Kielczewska, D; Kikawa, T; Kilinski, A; Kim, J. Y.; Kim, J; Kim, S. B.; Kirby, B; Kisiel, J; Kitching, P; Kobayashi, T; Kogan, G; Kolaceke, A; Konaka, A; Kormos, L. L.; Korzenev, A; Koseki, K; Koshio, Y; Kowalik, K; Kreslo, I; Kropp, W; Kubo, H; Kudenko, Y; Kumaratunga, S; Kurjata, R; Kutter, T; Lagoda, J; Laihem, K; Laing, A; Laveder, M; Lawe, M; Lazos, M; Lee, K. P.; Licciardi, C; Lim, I. T.; Lindner, T; Lister, C; Litchfield R. P., 54; Longhin, A; Lopez, G. D.; Ludovici, L; Macaire, M; Magaletti, Lorenzo; Mahn, K; Malek, M; Manly, S; Marchionni, A; Marino, A. D.; Marteau, J; Martin, J. F.; Maruyama, T; Marzec, J; Masliah, P; Mathie, E. L.; Matveev, V; Mavrokoridis, K; Mazzucato, E; Mccauley, N; Mcfarland, K. S.; Mcgrew, C; Mclachlan, T; Messina, M; Metelko, C; Mezzetto, M; Mijakowski, P; Miller, C. A.; Minamino, A; Mineev, O; Mine, S; Missert, A; Miura, M; Monfregola, L; Moriyama, S; Mueller Th, A; Murakami, A; Murdoch, M; Murphy S., 13; Myslik, J; Nagasaki, T; Nakadaira, T; Nakahata, M; Nakai, T; Nakajima, K; Nakamura, K; Nakayama, S; Nakaya, T; Nakayoshi, K; Naples, D; Nicholls, T. C.; Nielsen, C; Nirkko, M; Nishikawa, K; Nishimura, Y; O'Keeffe, H. M.; Obayashi, Y; Ohta, R; Okumura, K; Okusawa, T; Oryszczak, W; Oser, S. M.; Otani, M; Owen, R. A.; Oyama, Y; Pac, M. Y.; Palladino, V; Paolone, V; Payne, D; Pearce, G. F.; Perevozchikov, O; Perkin, J. D.; Petrov, Y; Guerra E. S., Pinzon; Plonski, P; Poplawska, E; Popov, B; Posiadala, M; Poutissou, J. M.; Poutissou, R; Przewlocki, P; Quilain, B; Radicioni, E; Ratoff, P. N.; Ravonel, M; Rayner, M. A. M.; Reeves, M; Reinherz Aronis, E; Retiere, F; Robert, A; Rodrigues, P. A.; Rondio, E; Roth, S; Rubbia, A; Ruterbories, D; Sacco, R; Sakashita, K; Sanchez, F; Scantamburlo, E; Scholberg, K; Schwehr, J; Scott, M; Scully, D. I.; Seiya, Y; Sekiguchi, T; Sekiya, H; Sgalaberna, D; Shibata, M; Shiozawa, M; Short, S; Shustrov, Y; Sinclair, P; Smith, B; Smith, R. J.; Smy, M; Sobczyk, J. T.; Sobel, H; Sorel, M; Southwell, L; Stamoulis, P; Steinmann, J; Still, B; Suzuki, A; Suzuki, K; Suzuki, S. Y.; Suzuki, Y; Szeglowski, T; Szeptycka, M; Tacik R., 39; Tada, M; Takahashi, S; Takeda, A; Takeuchi, Y; Tanaka, H. A.; Tanaka, M. M.; Tanaka, M; Taylor, I. J.; Terhorst, D; Terri, R; Thompson, L. F.; Thorley, A; Tobayama, S; Toki, W; Tomura, T; Totsuka, Y; Touramanis, C; Tsukamoto, T; Tzanov, M; Uchida, Y; Ueno, K; Vacheret, A; Vagins, M; Vasseur, G; Wachala, T; Waldron, A. V.; Walter, C. W.; Wark D., 45; Wascko, M. O.; Weber A., 45; Wendell, R; Wilkes, R. J.; Wilking, M. J.; Wilkinson, C; Williamson, Z; Wilson, J. R.; Wilson, R. J.; Wongjirad, T; Yamada, Y; Yamamoto, K; Yanagisawa, C; Yen, S; Yershov, N; Yokoyama, M; Yuan, T; Zalewska, A; Zambelli, L; Zaremba, K; Ziembicki, M; Zimmerman, E. D.; Zito, M; Zmuda, J.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - ELETTRONICO. - 88:3(2013), pp. 032002.1-032002.41. [10.1103/PhysRevD.88.032002]