Observation of electron neutrino appearance in a muon neutrino beam

Abe, K. et al. (2014) Observation of electron neutrino appearance in a muon neutrino beam. Physical Review Letters, 112(6), 061802. (doi:10.1103/PhysRevLett.112.061802)

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Abstract

The T2K experiment has observed electron neutrino appearance in a muon neutrino beam produced 295 km from the Super-Kamiokande detector with a peak energy of 0.6 GeV. A total of 28 electron neutrino events were detected with an energy distribution consistent with an appearance signal, corresponding to a significance of 7.3 σ when compared to 4.92 ± 0.55 expected background events. In the Pontecorvo-Maki-Nakagawa-Sakata mixing model, the electron neutrino appearance signal depends on several parameters including three mixing angles θ 12 , θ 23 , θ 13 , a mass difference Δ m 2 32 and a C P violating phase δ C P . In this neutrino oscillation scenario, assuming | Δ m 2 32 | = 2.4 × 10 − 3     eV 2 , sin 2 θ 23 = 0.5 , and Δ m 2 32 > 0 ( Δ m 2 32 < 0 ), a best-fit value of sin 2 2 θ 13 = 0.14 0 + 0.038 − 0.032 ( 0.17 0 + 0.045 − 0.037 ) is obtained at δ C P = 0 . When combining the result with the current best knowledge of oscillation parameters including the world average value of θ 13 from reactor experiments, some values of δ C P are disfavored at the 90% C.L.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Litchfield, Dr Phillip
Authors: Abe, K., Adam, J., Aihara, H., Akiri, T., 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, V., Berger, B. E., Berkman, S., Bertram, I., Bhadra, S., Blaszczyk, F. d. M., Blondel, A., Bojechko, C., Bordoni, S., Boyd, S. B., Brailsford, D., Bravar, A., Bronner, C., Buchanan, N., Calland, R. G., Caravaca Rodríguez, 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., Dabrowska, A., Danko, I., Das, R., Davis, S., de Perio, P., De Rosa, G., Dealtry, T., Dennis, S. R., Densham, C., Di Lodovico, F., Di Luise, S., Drapier, O., Duboyski, T., Duffy, K., Dufour, F., Dumarchez, J., Dytman, S., Dziewiecki, M., Emery, S., Ereditato, A., Escudero, L., Finch, A. J., Floetotto, L., Friend, M., Fujii, Y., Fukuda, Y., Furmanski, A. P., Galymov, V., Gaudin, A., Giffin, S., Giganti, C., Gilje, K., Goeldi, D., 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., 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., Jacob, A., Jamieson, B., Johnson, R. A., Jo, J. H., Jonsson, P., Jung, C. K., Kaboth, A. C., Kajita, T., Kakuno, H., Kameda, J., Kanazawa, Y., Karlen, D., Karpikov, I., Kearns, E., Khabibullin, M., Khotjantsev, A., Kielczewska, D., Kikawa, T., Kilinski, A., Kim, J., Kisiel, J., Kitching, P., Kobayashi, T., Koch, L., Kolaceke, A., Konaka, A., Kormos, L. L., Korzenev, A., Koseki, K., Koshio, Y., Kreslo, I., Kropp, W., Kubo, H., Kudenko, Y., Kumaratunga, S., Kurjata, R., Kutter, T., Lagoda, J., Laihem, K., Lamont, I., Laveder, M., Lawe, M., Lazos, M., Lee, K. P., Licciardi, C., Lindner, T., Lister, C., Litchfield, R. P., Longhin, A., Ludovici, L., Macaire, M., Magaletti, L., Mahn, K., Malek, M., Manly, S., Marino, A. D., Marteau, J., Martin, J. F., Maruyama, T., Marzec, J., Mathie, E. L., Matveev, V., Mavrokoridis, K., Mazzucato, E., McCarthy, M., McCauley, N., McFarland, K. S., McGrew, C., Metelko, C., Mezzetto, M., Mijakowski, P., Miller, C. A., Minamino, A., Mineev, O., Mine, S., Missert, A., Miura, M., Monfregola, L., Moriyama, S., Mueller, T. A., Murakami, A., Murdoch, M., Murphy, S., Myslik, J., Nagasaki, T., Nakadaira, T., Nakahata, M., Nakai, T., Nakamura, K., Nakayama, S., Nakaya, T., Nakayoshi, K., Naples, D., Nielsen, C., Nirkko, M., Nishikawa, K., Nishimura, Y., O’Keeffe, H. M., Ohta, R., Okumura, K., Okusawa, T., Oryszczak, W., Oser, S. M., Owen, R. A., Oyama, Y., Palladino, V., Paolone, V., Payne, D., Pearce, G. F., Perevozchikov, O., Perkin, J. D., Petrov, Y., Pickard, L. J., Pinzon Guerra, E. S., Pistillo, C., 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., Redij, A., Reeves, M., Reinherz-Aronis, E., Retiere, F., Robert, A., Rodrigues, P. A., Rojas, P., Rondio, E., Roth, S., Rubbia, A., Ruterbories, D., Sacco, R., Sakashita, K., Sánchez, F., Sato, F., Scantamburlo, E., Scholberg, K., Schwehr, J., Scott, M., Seiya, Y., Sekiguchi, T., Sekiya, H., Sgalaberna, D., 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., Suda, Y., Suzuki, A., Suzuki, K., Suzuki, S. Y., Suzuki, Y., Szeglowski, T., Tacik, R., Tada, M., Takahashi, S., Takeda, A., Takeuchi, Y., Tanaka, H. K., Tanaka, H. A., Tanaka, M. M., 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., Wascko, M. O., Weber, A., 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., Zalipska, J., Zambelli, L., Zaremba, K., Ziembicki, M., Zimmerman, E. D., Zito, M., and Żmuda, J.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN:0031-9007
ISSN (Online):1079-7114
Published Online:10 February 2014

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