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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Observation of electron neutrino appearance in a muon neutrino beam
AU - Abe, K.
AU - Adam, J.
AU - Aihara, H.
AU - Akiri, T.
AU - Andreopoulos, C.
AU - Aoki, S.
AU - Ariga, A.
AU - Ariga, T.
AU - Assylbekov, S.
AU - Autiero, D.
AU - Barbi, M.
AU - Barker, G. J.
AU - Barr, G.
AU - Bass, M.
AU - Batkiewicz, M.
AU - Bay, F.
AU - Bentham, S. W.
AU - Berardi, V.
AU - Berger, B. E.
AU - Berkman, S.
AU - Bertram, I.
AU - Bhadra, S.
AU - Blaszczyk, F. D. M.
AU - Blondel, A.
AU - Bojechko, C.
AU - Bordoni, S.
AU - Boyd, S. B.
AU - Brailsford, Dominic
AU - Bravar, A.
AU - Bronner, C.
AU - Buchanan, N.
AU - Calland, R. G.
AU - Caravaca Rodriguez, J.
AU - Cartwright, S. L.
AU - Castillo, R.
AU - Catanesi, M. G.
AU - Cervera, A.
AU - Cherdack, D.
AU - Christodoulou, G.
AU - Clifton, A.
AU - Coleman, J.
AU - Dealtry, Thomas
AU - Finch, A. J.
AU - Grant, N.
AU - Kormos, L. L.
AU - Lamont, I.
AU - O'Keeffe, H. M.
AU - Ratoff, P. N.
AU - Reeves, M.
AU - Southwell, L.
AU - T2K Collaboration
N1 - © 2014 American Physical Society
PY - 2014/2/10
Y1 - 2014/2/10
N2 - 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 7.3 sigma 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 theta(12), theta(23), theta(13), a mass difference vertical bar Delta m(32)(2)vertical bar and a CP violating phase delta(CP). In this neutrino oscillation scenario, assuming vertical bar Delta m(32)(2)vertical bar = 2.4 x 10(-3) eV(2), sin theta(2)(23) = 0.5, and vertical bar Delta m(32)(2)vertical bar > 0 (vertical bar Delta m(32)(2)vertical bar <0), a best- fit value of sin2 theta(2)(13) = 0.140(- 0.032)(+0.038) (0.170(-0.037)(+0.045)) is obtained at delta(CP) = 0. When combining the result with the current best knowledge of oscillation parameters including the world average value of theta(13) from reactor experiments, some values of delta(CP) are disfavored at the 90% C. L.
AB - 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 7.3 sigma 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 theta(12), theta(23), theta(13), a mass difference vertical bar Delta m(32)(2)vertical bar and a CP violating phase delta(CP). In this neutrino oscillation scenario, assuming vertical bar Delta m(32)(2)vertical bar = 2.4 x 10(-3) eV(2), sin theta(2)(23) = 0.5, and vertical bar Delta m(32)(2)vertical bar > 0 (vertical bar Delta m(32)(2)vertical bar <0), a best- fit value of sin2 theta(2)(13) = 0.140(- 0.032)(+0.038) (0.170(-0.037)(+0.045)) is obtained at delta(CP) = 0. When combining the result with the current best knowledge of oscillation parameters including the world average value of theta(13) from reactor experiments, some values of delta(CP) are disfavored at the 90% C. L.
U2 - 10.1103/PhysRevLett.112.061802
DO - 10.1103/PhysRevLett.112.061802
M3 - Journal article
VL - 112
JO - Physical review letters
JF - Physical review letters
SN - 0031-9007
IS - 6
M1 - 061802
ER -