Measurement of neutrino oscillation parameters from muon neutrino disappearance with an off-axis beam

K. Abe, J. Adam, H. Aihara, T. Akiri, C. Andreopoulos, S. Aoki, A. Ariga, T. Ariga, S. Assylbekov, D. Autiero, M. Barbi, G. J. Barker, G. Barr, M. Bass, M. Batkiewicz, F. Bay, S. W. Bentham, V. Berardi, B. E. Berger, S. BerkmanI. Bertram, S. Bhadra, F. D.M. Blaszczyk, A. Blondel, C. Bojechko, S. Bordoni, S. B. Boyd, D. Brailsford, A. Bravar, C. Bronner, N. Buchanan, R. G. Calland, J. Caravaca Rodríguez, S. L. Cartwright, R. Castillo, M. G. Catanesi, A. Cervera, D. Cherdack, G. Christodoulou, A. Clifton, J. Coleman, S. J. Coleman, G. Collazuol, K. Connolly, L. Cremonesi, A. Curioni, A. Dabrowska, I. Danko, R. Das, S. Davis, T2K Collaboration

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Abstract

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 × 1020 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 sin223) = 0.514 ± 0.082 and mass splitting |Δm232| = 2.44+0.17-0.15 × 10-3 eV2/c4. Our result corresponds to the maximal oscillation disappearance probability.

Original languageEnglish
Article number211803
JournalPhysical Review Letters
Volume111
Issue number21
DOIs
Publication statusPublished - Nov 19 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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