Observation of electron neutrino appearance in a muon neutrino 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 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, T2K Collaboration

研究成果: ジャーナルへの寄稿学術誌査読

399 被引用数 (Scopus)

抄録

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 Δm2 32and a CP violating phase δCP. In this neutrino oscillation scenario, assuming |Δm2 32| = 2.4 × 10-3eV2, sin2θ23= 0.5, and Δm2 32> 0 (Δm2 32< 0), a best-fit value of sin213= 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 θ13from reactor experiments, some values of δCPare disfavored at the 90% C.L.

本文言語英語
論文番号061802
ジャーナルPhysical Review Letters
112
6
DOI
出版ステータス出版済み - 2月 10 2014
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 物理学および天文学(全般)

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