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Ariga, A; Autiero, D; Batkiewicz, M; Bay, F; Berkman, S; Bordoni, S; Brailsford, D; Buizza Avanzini, M; Cervera, A; Clifton, A; Cremonesi, L; De Rosa, G; Dennis, S R; Di Lodovico, F; Dolan, S; Drapier, O; Dziewiecki, M; Emery-Schrenk, S; Finch, A J; Fiorentini, G A; Hillairet, A; Hogan, M; Horikawa, S; Ieki, K; Irvine, T J; Iwamoto, K; Jonsson, P; Kabirnezhad, M; Kajita, T; Kameda, J; Karlen, D; Khotjantsev, A; Kielczewska, D; Knight, A; Kobayashi, T; Konaka, A; Kormos, L L; Koshio, Y; Kropp, W; Kurjata, R; Lamont, I; Laveder, M; Mahn, K; Martin, J F; Martynenko, S; Ma, W Y; McFarland, K S; McGrew, C; Mineev, O; Mine, S; Moriyama, S; Murphy, S; Nakadaira, T; Nakahata, M; Nakaya, T; Nakayoshi, K; Nirkko, M; Nishimura, Y; Okusawa, T; Owen, R A; Oyama, Y; Palomino, J L; Pavin, M; Perkin, J D; Pickering, L; Popov, B; Quilain, B; Ratoff, P N; Ravonel, M; Rayner, M A M; Roth, S; Sánchez, F; Sekiguchi, T; Shah, R; Shaikhiev, A; Shaker, F; Shiozawa, M; Short, S; Sorel, M; Suzuki, K; Suzuki, S Y; Tacik, R; Takeda, A; Thakore, T; Thompson, L F; Tobayama, S; Tomura, T; Vallari, Z; Wachala, T; Walter, C W; Warzycha, W; Weber, A; Wilking, M J; Wilson, J R; Yamada, Y; Yamamoto, M; Yano, T; Yuan, T; Zambelli, L; Zimmerman, E D
Physical review letters, 2016-May-06, Letnik: 116, Številka: 18Journal Article
T2K reports its first measurements of the parameters governing the disappearance of νover ¯_{μ} in an off-axis beam due to flavor change induced by neutrino oscillations. The quasimonochromatic νover ¯_{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 νover ¯_{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}(θover ¯_{23})=0.45 and |Δmover ¯_{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.
