Rights statement: © 2017 American Physical Society
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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 - Measurement of neutrino and antineutrino oscillations by the T2K experiment including a new additional sample of $ν_e$ interactions at the far detector
AU - Abe, K.
AU - Amey, J.
AU - Andreopoulos, C.
AU - Antonova, M.
AU - Aoki, S.
AU - Ariga, A.
AU - Ashida, Y.
AU - Ban, S.
AU - Barbi, M.
AU - Barker, G. J.
AU - Barr, G.
AU - Barry, C.
AU - Batkiewicz, M.
AU - Berardi, V.
AU - Berkman, S.
AU - Bhadra, S.
AU - Bienstock, S.
AU - Blondel, A.
AU - Bolognesi, S.
AU - Bordoni, S.
AU - Brailsford, D.
AU - Bravar, A.
AU - Bronner, C.
AU - Avanzini, M. Buizza
AU - Calland, R. G.
AU - Campbell, T.
AU - Cao, S.
AU - Catanesi, M. G.
AU - Cervera, A.
AU - Chappell, A.
AU - Checchia, C.
AU - Cherdack, D.
AU - Chikuma, N.
AU - Christodoulou, G.
AU - Coleman, J.
AU - Collazuol, G.
AU - Coplowe, D.
AU - Cudd, A.
AU - Dabrowska, A.
AU - Rosa, G. De
AU - Dealtry, T.
AU - Finch, A. J.
AU - Knox, A.
AU - Kormos, L. L.
AU - Lamont, I.
AU - Lawe, M.
AU - Nowak, J.
AU - O'Keeffe, H. M.
AU - Ratoff, P. N.
AU - Shaw, D.
AU - T2K Collaboration
N1 - © 2017 American Physical Society
PY - 2017/11/21
Y1 - 2017/11/21
N2 - The T2K experiment reports an updated analysis of neutrino and antineutrino oscillations in appearance and disappearance channels. A sample of electron neutrino candidates at Super-Kamiokande in which a pion decay has been tagged is added to the four single-ring samples used in previous T2K oscillation analyses. Through combined analyses of these five samples, simultaneous measurements of four oscillation parameters, $|\Delta m^2_{32}|$, $\sin^2(\theta_{23})$, $\sin^2(\theta_{13})$, and $\delta_{CP}$ and of the mass ordering are made. A set of studies of simulated data indicates that the sensitivity to the oscillation parameters is not limited by neutrino interaction model uncertainty. Multiple oscillation analyses are performed, and frequentist and Bayesian intervals are presented for combinations of the oscillation parameters with and without the inclusion of reactor constraints on $\sin^2(\theta_{13})$. When combined with reactor measurements, the hypothesis of CP conservation ($\delta_{CP}$$=0$ or $\pi$) is excluded at 90% confidence level. The 90% confidence region for $\delta_{CP}$ is [-2.95,-0.44] ([-1.47, -1.27]) for normal (inverted) ordering. The central values and 68\% confidence intervals for the other oscillation parameters for normal (inverted) ordering are $\Delta m^{2}_{32}=2.54\pm0.08$ ($2.51\pm0.08$) $\times 10^{-3}$ eV$^2 / c^4$ and $\sin^2(\theta_{23}) = 0.55^{+0.05}_{-0.09}$ ($0.55^{+0.05}_{-0.08}$), compatible with maximal mixing. In the Bayesian analysis, the data weakly prefer normal ordering (Bayes factor 3.7) and the upper octant for $\sin^2(\theta_{23})$ (Bayes factor 2.4).
AB - The T2K experiment reports an updated analysis of neutrino and antineutrino oscillations in appearance and disappearance channels. A sample of electron neutrino candidates at Super-Kamiokande in which a pion decay has been tagged is added to the four single-ring samples used in previous T2K oscillation analyses. Through combined analyses of these five samples, simultaneous measurements of four oscillation parameters, $|\Delta m^2_{32}|$, $\sin^2(\theta_{23})$, $\sin^2(\theta_{13})$, and $\delta_{CP}$ and of the mass ordering are made. A set of studies of simulated data indicates that the sensitivity to the oscillation parameters is not limited by neutrino interaction model uncertainty. Multiple oscillation analyses are performed, and frequentist and Bayesian intervals are presented for combinations of the oscillation parameters with and without the inclusion of reactor constraints on $\sin^2(\theta_{13})$. When combined with reactor measurements, the hypothesis of CP conservation ($\delta_{CP}$$=0$ or $\pi$) is excluded at 90% confidence level. The 90% confidence region for $\delta_{CP}$ is [-2.95,-0.44] ([-1.47, -1.27]) for normal (inverted) ordering. The central values and 68\% confidence intervals for the other oscillation parameters for normal (inverted) ordering are $\Delta m^{2}_{32}=2.54\pm0.08$ ($2.51\pm0.08$) $\times 10^{-3}$ eV$^2 / c^4$ and $\sin^2(\theta_{23}) = 0.55^{+0.05}_{-0.09}$ ($0.55^{+0.05}_{-0.08}$), compatible with maximal mixing. In the Bayesian analysis, the data weakly prefer normal ordering (Bayes factor 3.7) and the upper octant for $\sin^2(\theta_{23})$ (Bayes factor 2.4).
KW - hep-ex
U2 - 10.1103/PhysRevD.96.092006
DO - 10.1103/PhysRevD.96.092006
M3 - Journal article
VL - 96
JO - Physical Review D
JF - Physical Review D
SN - 1550-7998
IS - 9
M1 - 092006
ER -