Measurement of Muon Antineutrino Oscillations with an Accelerator-Produced Off-Axis Beam.
K Abe, C Andreopoulos, M Antonova, S Aoki, A Ariga, S Assylbekov, D Autiero, M Barbi, G J Barker, G Barr, P Bartet-Friburg, M Batkiewicz, F Bay, V Berardi, S Berkman, S Bhadra, A Blondel, S Bolognesi, S Bordoni, S B Boyd, D Brailsford, A Bravar, C Bronner, M Buizza Avanzini, R G Calland, S Cao, J Caravaca Rodríguez, S L Cartwright, R Castillo, M G Catanesi, A Cervera, D Cherdack, N Chikuma, G Christodoulou, A Clifton, J Coleman, G Collazuol, L Cremonesi, A Dabrowska, G De Rosa, T Dealtry, P F Denner, S R Dennis, C Densham, D Dewhurst, F Di Lodovico, S Di Luise, S Dolan, O Drapier, K E Duffy, J Dumarchez, S Dytman, M Dziewiecki, S Emery-Schrenk, A Ereditato, T Feusels, A J Finch, G A Fiorentini, M Friend, Y Fujii, D Fukuda, Y Fukuda, A P Furmanski, V Galymov, A Garcia, S G Giffin, C Giganti, F Gizzarelli, M Gonin, N Grant, D R Hadley, L Haegel, M D Haigh, P Hamilton, D Hansen, T Hara, M Hartz, T Hasegawa, N C Hastings, T Hayashino, Y Hayato, R L Helmer, M Hierholzer, A Hillairet, A Himmel, T Hiraki, S Hirota, M Hogan, J Holeczek, S Horikawa, F Hosomi, K Huang, A K Ichikawa, K Ieki, M Ikeda, J Imber, J Insler, R A Intonti, T J Irvine, T Ishida, T Ishii, E Iwai, K Iwamoto, A Izmaylov, A Jacob, B Jamieson, M Jiang, S Johnson, J H Jo, P Jonsson, C K Jung, M Kabirnezhad, A C Kaboth, T Kajita, H Kakuno, J Kameda, D Karlen, I Karpikov, T Katori, E Kearns, M Khabibullin, A Khotjantsev, D Kielczewska, T Kikawa, H Kim, J Kim, S King, J Kisiel, A Knight, A Knox, T Kobayashi, L Koch, T Koga, A Konaka, K Kondo, A Kopylov, L L Kormos, A Korzenev, Y Koshio, W Kropp, Y Kudenko, R Kurjata, T Kutter, J Lagoda, I Lamont, E Larkin, M Laveder, M Lawe, M Lazos, T Lindner, Z J Liptak, R P Litchfield, X Li, A Longhin, J P Lopez, L Ludovici, X Lu, L Magaletti, K Mahn, M Malek, S Manly, A D Marino, J Marteau, J F Martin, P Martins, S Martynenko, T Maruyama, V Matveev, K Mavrokoridis, W Y Ma, E Mazzucato, M McCarthy, N McCauley, K S McFarland, C McGrew, A Mefodiev, M Mezzetto, P Mijakowski, A Minamino, O Mineev, S Mine, A Missert, M Miura, S Moriyama, Th A Mueller, S Murphy, J Myslik, T Nakadaira, M Nakahata, K G Nakamura, K Nakamura, K D Nakamura, S Nakayama, T Nakaya, K Nakayoshi, C Nantais, C Nielsen, M Nirkko, K Nishikawa, Y Nishimura, J Nowak, H M O'Keeffe, R Ohta, K Okumura, T Okusawa, W Oryszczak, S M Oser, T Ovsyannikova, R A Owen, Y Oyama, V Palladino, J L Palomino, V Paolone, N D Patel, M Pavin, D Payne, J D Perkin, Y Petrov, L Pickard, L Pickering, E S Pinzon Guerra, C Pistillo, B Popov, M Posiadala-Zezula, J-M Poutissou, R Poutissou, P Przewlocki, B Quilain, E Radicioni, P N Ratoff, M Ravonel, M A M Rayner, A Redij, E Reinherz-Aronis, C Riccio, P Rojas, E Rondio, S Roth, A Rubbia, A Rychter, R Sacco, K Sakashita, F Sánchez, F Sato, E Scantamburlo, K Scholberg, S Schoppmann, J Schwehr, M Scott, Y Seiya, T Sekiguchi, H Sekiya, D Sgalaberna, R Shah, A Shaikhiev, F Shaker, D Shaw, M Shiozawa, T Shirahige, S Short, M Smy, J T Sobczyk, M Sorel, L Southwell, P Stamoulis, J Steinmann, T Stewart, Y Suda, S Suvorov, A Suzuki, K Suzuki, S Y Suzuki, Y Suzuki, R Tacik, M Tada, S Takahashi, A Takeda, Y Takeuchi, H K Tanaka, H A Tanaka, D Terhorst, R Terri, T Thakore, L F Thompson, S Tobayama, W Toki, T Tomura, C Touramanis, T Tsukamoto, M Tzanov, Y Uchida, A Vacheret, M Vagins, Z Vallari, G Vasseur, T Wachala, K Wakamatsu, C W Walter, D Wark, W Warzycha, M O Wascko, A Weber, R Wendell, R J Wilkes, M J Wilking, C Wilkinson, J R Wilson, R J Wilson, Y Yamada, K Yamamoto, M Yamamoto, C Yanagisawa, T Yano, S Yen, N Yershov, M Yokoyama, J Yoo, K Yoshida, T Yuan, M Yu, A Zalewska, J Zalipska, L Zambelli, K Zaremba, M Ziembicki, E D Zimmerman, M Zito, J Żmuda
T2K reports its first measurements of the parameters governing the disappearance of ν[over ¯]_{μ} in an off-axis beam due to flavor change induced by neutrino oscillations. The quasimonochromatic ν[over ¯]_{μ} beam, produced with a peak energy of 0.6 GeV at J-PARC, is observed at the far detector Super-Kamiokande, 295 km away, where the ν[over ¯]_{μ} survival probability is expected to be minimal. Using a data set corresponding to 4.01×10^{20} protons on target, 34 fully contained μ-like events were observed. The best-fit oscillation parameters are sin^{2}(θ[over ¯]_{23})=0.45 and |Δm[over ¯]_{32}^{2}|=2.51×10^{-3} eV^{2} with 68% confidence intervals of 0.38-0.64 and 2.26-2.80×10^{-3} eV^{2}, respectively. These results are in agreement with existing antineutrino parameter measurements and also with the ν_{μ} disappearance parameters measured by T2K.
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