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The T2K experiment reports an updated analysis of neutrino and antineutrinooscillations in appearance and disappearance channels. A sample of electronneutrino candidates at Super-Kamiokande in which a pion decay has been taggedis added to the four single-ring samples used in previous T2K oscillationanalyses. Through combined analyses of these five samples, simultaneousmeasurements of four oscillation parameters, $|\Delta m^2_{32}|$,$\sin^2(\theta_{23})$, $\sin^2(\theta_{13})$, and $\delta_{CP}$ and of the massordering are made. A set of studies of simulated data indicates that thesensitivity to the oscillation parameters is not limited by neutrinointeraction model uncertainty. Multiple oscillation analyses are performed, andfrequentist and Bayesian intervals are presented for combinations of theoscillation parameters with and without the inclusion of reactor constraints on$\sin^2(\theta_{13})$. When combined with reactor measurements, the hypothesisof CP conservation ($\delta_{CP}$$=0$ or $\pi$) is excluded at 90% confidencelevel. 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\% confidenceintervals for the other oscillation parameters for normal (inverted) orderingare $\Delta m^{2}_{32}=2.54\pm0.08$ ($2.51\pm0.08$) $\times 10^{-3}$ 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 weaklyprefer normal ordering (Bayes factor 3.7) and the upper octant for$\sin^2(\theta_{23})$ (Bayes factor 2.4).

physical review. d/physical review. d.

Measurement of neutrino and antineutrino oscillations by the T2K  experiment including a new additional sample of $\nu_e$ interactions at the  far detector