Evidence of electron neutrino appearance in a muon neutrino beam

Abgrall, N. and Aihara, H. and Akiri, T. and B. Albert, J. and Andreopoulos, C. and Aoki, S. and Ariga, A. and Ariga, T. and Assylbekov, S. and Autiero, D. and Barbi, M. and J. Barker, G. and Barr, G. and Bass, M. and Batkiewicz, M. and Bay, F. and W. Bentham, S. and Berardi, V. and E. Berger, B. and Berkman, S. and Bertram, I. and Beznosko, D. and Bhadra, S. and d. M. Blaszczyk, F. and Blondel, A. and Bojechko, C. and Boyd, S. and Brailsford, Dominic and Bravar, A. and Bronner, C. and G. Brook-Roberge, D. and Buchanan, N. and G. Calland, R. and Caravaca Rodriguez, J. and L. Cartwright, S. and Castillo, R. and G. Catanesi, M. and Cervera, A. and Cherdack, D. and Christodoulou, G. and Clifton, A. and Coleman, J. and Dealtry, Thomas and J. Finch, A. and Grant, N. and L. Kormos, L. and O'Keeffe, Helen and N. Ratoff, P. and Reeves, M. and Southwell, L. (2013) Evidence of electron neutrino appearance in a muon neutrino beam. Physical Review D, 88 (3). ISSN 1550-7998

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The T2K collaboration reports evidence for electron neutrino appearance at the atmospheric mass splitting, |\Delta m_{32}^2|=2.4x10^{-3} eV^2. An excess of electron neutrino interactions over background is observed from a muon neutrino beam with a peak energy of 0.6 GeV at the Super-Kamiokande (SK) detector 295 km from the beam's origin. Signal and background predictions are constrained by data from near detectors located 280 m from the neutrino production target. We observe 11 electron neutrino candidate events at the SK detector when a background of 3.3\pm0.4(syst.) events is expected. The background-only hypothesis is rejected with a p-value of 0.0009 (3.1\sigma), and a fit assuming \nu_{\mu}->\nu_e oscillations with sin^2(2\theta_{23})=1, \delta_{CP}=0 and |\Delta m_{32}^2|=2.4x10^{-3} eV^2 yields sin^2(2\theta_{13})=0.088^{+0.049}_{-0.039}(stat.+syst.).

Item Type:
Journal Article
Journal or Publication Title:
Physical Review D
Additional Information:
41 pages, 41 figures © 2013 American Physical Society
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Deposited On:
21 Oct 2013 17:58
Last Modified:
10 Jul 2020 02:52