Observation of Electron Neutrino Appearance in a Muon Neutrino Beam

The T2K Collaboration, G Barr, M Bass, M Batkiewicz, F Bay, S. W Bentham, V Berardi, B. E Berger, S Berkman, I Bertram, S Bhadra, F. d. M Blaszczyk, A Blondel, C Bojechko, S Bordoni, S. B Boyd, D Brailsford, A Bravar, C Bronner, N BuchananR. G Calland, J Caravaca Rodriguez, 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 Dabrowska, I Danko, R Das, S Davis, P de Perio, G de Rosa, T Dealtry, S. R Dennis, C Densham

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Abstract

The T2K experiment has observed electron neutrino appearance in a muon neutrino beam produced 295 km from the Super-Kamiokande detector with a peak energy of 0.6 GeV. A total of 28 electron neutrino events were detected with an energy distribution consistent with an appearance signal, corresponding to a significance of 7.3σ when compared to 4.92±0.55 expected background events. In the Pontecorvo-Maki-Nakagawa-Sakata mixing model, the electron neutrino appearance signal depends on several parameters including three mixing angles θ12, θ23, θ13, a mass difference Δm232 and a CP violating phase δCP. In this neutrino oscillation scenario, assuming |Δm232|=2.4×10−3 eV2, sin2θ23=0.5 , and Δm232>0 (Δm232<0), a best-fit value of sin 2θ13=0.140+0.038−0.032 ( 0.170+0.045−0.037) is obtained at δCP=0. When combining the result with the current best knowledge of oscillation parameters including the world average value of θ13 from reactor experiments, some values of δCP are disfavored at the 90% C.L
Original languageEnglish
Pages (from-to)061802-1-061802-8
JournalPhysical Review Letters
Volume112
Issue number6
Early online date10 Feb 2014
DOIs
Publication statusPublished - 14 Feb 2014

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