Publications [#303760] of Christopher Walter

Papers Published
  1. collaboration, T; Abe, K; Abgrall, N; Aihara, H; Akiri, T; Andreopoulos, C; Aoki, S; Ariga, A; Ariga, T; Assylbekov, S; Autiero, D; Barbi, M; Barker, GJ; Barr, G; Bass, M; Batkiewicz, M; Bay, F; Bentham, SW; Berardi, V; Berger, BE; Berkman, S; Bertram, I; Bhadra, S; Blaszczyk, FDM; Blondel, A; Bojechko, C; Boyd, SB; Brailsford, D; Bravar, A; Bronner, C; Buchanan, N; Calland, RG; Rodriguez, JC; Cartwright, SL; Castillo, R; Catanesi, MG; Cervera, A; Cherdack, D; Christodoulou, G; Clifton, A et al., Measurement of Neutrino Oscillation Parameters from Muon Neutrino Disappearance with an Off-axis Beam, Phys. Rev. Lett., vol. 111 (August, 2013), pp. 211803 [1308.0465v2], [doi] .

    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 $3.01 \times 10^20$ protons on target. In the absence of neutrino oscillations, $205 \pm 17$ (syst.) events are expected to be detected and only 58 muon neutrino event candidates are observed. A fit to the neutrino rate and energy spectrum assuming three neutrino flavors, normal mass hierarchy and $\theta_23\leq \pi/4$ yields a best-fit mixing angle $\sin^2(2\theta_23)=1.000$ and mass splitting $|\Delta m^2_32| =2.44 \times 10^{-3}$ eV$^2$/c$^4$. If $\theta_23\geq \pi/4$ is assumed, the best-fit mixing angle changes to $\sin^2(2\theta_23)=0.999$ and the mass splitting remains unchanged.