First muon-neutrino disappearance study with an off-axis beam
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First muon-neutrino disappearance study with an off-axis beam

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First muon-neutrino disappearance study with an off-axis beam

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T2K Collaboration; Abe, K.; Cervera Villanueva, Anselmo; Escudero Sánchez, Lorena; Gómez Cadenas, Juan José Perfil; Hansen, C.; Monfregola, Laura; Sorel, Michel; Stamoulis, Panagiotis
Aquest document és un/a article, creat/da en: 2012
We report a measurement of muon-neutrino disappearance in the T2K experiment. The 295-km muon-neutrino beam from Tokai to Kamioka is the first implementation of the off-axis technique in a long-baseline neutrino oscillation experiment. With data corresponding to 1.43 x 10(20) protons on target, we observe 31 fully-contained single mu-like ring events in Super-Kamiokande, compared with an expectation of 104 +/- 14 (syst) events without neutrino oscillations. The best-fit point for two-flavor nu(mu) -> nu(tau) oscillations is sin(2)(2 theta(23)) = 0.98 and vertical bar Delta m(32)(2)vertical bar = 2.65 x 10(-3) eV(2). The boundary of the 90% confidence region includes the points sin(2)(2 theta(23)), vertical bar Delta m(32)(2)vertical bar = (1.0, 3.1 x 10(-3) eV(2)), (0.84, 2.65 x 10(-3) eV(2)) and (1.0, 2.2 x 10(-3) eV(2)).

    T2K Collaboration Abe, K. Cervera Villanueva, Anselmo Escudero Sánchez, Lorena Gómez Cadenas, Juan José Hansen, C. Monfregola, Laura Sorel, Michel Stamoulis, Panagiotis 2012 First muon-neutrino disappearance study with an off-axis beam Physical Review D 85 3 031103 - 1 031103 - 8
http://dx.doi.org/10.1103/PhysRevD.85.031103
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