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Aihara, H; Assylbekov, S; Bay, F; Bentham, S W; Bojechko, C; Buchanan, N; Christodoulou, G; Clifton, A; Coleman, S J; Cremonesi, L; Danko, I; Das, R; Davis, S; De Rosa, G; Dealtry, T; Densham, C; Duboyski, T; Dumarchez, J; Ereditato, A; Finch, A J; Fujii, Y; Furmanski, A P; Gilje, K; Gomez-Cadenas, J J; Gonin, M; Grant, N; Haesler, A; Hara, T; Hastings, N C; Hirota, S; Ishida, T; Ishii, T; Jacob, A; Kajita, T; Kanazawa, Y; Karlen, D; Karpikov, I; Kielczewska, D; Kitching, P; Kobayashi, T; Koseki, K; Koshio, Y; Kropp, W; Kudenko, Y; Kutter, T; Lindner, T; Litchfield, R P; Ludovici, L; Macaire, M; Manly, S; Martin, J F; Masliah, P; Mathie, E L; McFarland, K S; Moriyama, S; Mueller, Th A; Murdoch, M; Murphy, S; Nakadaira, T; Nakahata, M; Nakai, T; Nakayama, S; Nakaya, T; Nielsen, C; Nishikawa, K; Ohta, R; Okumura, K; Otani, M; Pistillo, C; Popov, B; Posiadala, M; Quilain, B; Robert, A; Rubbia, A; Ruterbories, D; Sakashita, K; Sato, F; Sgalaberna, D; Short, S; Sinclair, P; Smy, M; Stamoulis, P; Tacik, R; Takahashi, S; Tanaka, H A; Terhorst, D; Tomura, T; Touramanis, C; Tzanov, M; Ueno, K; Wachala, T; Walter, C W; Wark, D; Williamson, Z; Yamada, Y; Yen, S; Yuan, T; Zambelli, L; Ziembicki, M; Zito, M
Physical review letters, 2013-Nov-22, Letnik: 111, Številka: 21Journal Article
The T2K Collaboration reports a precision measurement of muon neutrino disappearance with an off-axis neutrino beam with a peak energy of 0.6 GeV. Near detector measurements are used to constrain the neutrino flux and cross section parameters. The Super-Kamiokande far detector, which is 295 km downstream of the neutrino production target, collected data corresponding to 3.01×10(20) protons on target. In the absence of neutrino oscillations, 205±17 (syst) events are expected to be detected while only 58 muon neutrino event candidates are observed. A fit to the neutrino rate and energy spectrum, assuming three neutrino flavors and normal mass hierarchy yields a best-fit mixing angle sin2(θ23)=0.514±0.082 and mass splitting |Δm(32)(2)|=2.44(-0.15)(+0.17)×10(-3) eV2/c4. Our result corresponds to the maximal oscillation disappearance probability.
