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The observation of the recent electron neutrino appearance in a muon neutrinobeam and the high-precision measurement of the mixing angle $\theta_{13}$ haveled to a re-evaluation of the physics potential of the T2K long-baselineneutrino oscillation experiment. Sensitivities are explored for CP violation inneutrinos, non-maximal $\sin^22\theta_{23}$, the octant of $\theta_{23}$, andthe mass hierarchy, in addition to the measurements of $\delta_{CP}$,$\sin^2\theta_{23}$, and $\Delta m^2_{32}$, for various combinations of$\nu$-mode and $\bar{\nu}$-mode data-taking.  With an exposure of $7.8\times10^{21}$~protons-on-target, T2K can achieve1-$\sigma$ resolution of 0.050(0.054) on $\sin^2\theta_{23}$ and$0.040(0.045)\times10^{-3}~\rm{eV}^2$ on $\Delta m^2_{32}$ for 100\%(50\%)neutrino beam mode running assuming $\sin^2\theta_{23}=0.5$ and $\Deltam^2_{32} = 2.4\times10^{-3}$ eV$^2$. T2K will have sensitivity to theCP-violating phase $\delta_{\rm{CP}}$ at 90\% C.L. or better over a significantrange. For example, if $\sin^22\theta_{23}$ is maximal (i.e$\theta_{23}$=$45^\circ$) the range is $-115^\circ<\delta_{\rm{CP}}<-60^\circ$for normal hierarchy and $+50^\circ<\delta_{\rm{CP}}<+130^\circ$ for invertedhierarchy. When T2K data is combined with data from the NO$\nu$A experiment,the region of oscillation parameter space where there is sensitivity to observea non-zero $\delta_{CP}$ is substantially increased compared to if eachexperiment is analyzed alone.

Neutrino Oscillation Physics Potential of the T2K Experiment