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The T2K collaboration reports a precision measurement of muon neutrinodisappearance with an off-axis neutrino beam with a peak energy of 0.6 GeV.Near detector measurements are used to constrain the neutrino flux and crosssection parameters. The Super-Kamiokande far detector, which is 295 kmdownstream of the neutrino production target, collected data corresponding to$3.01 \times 10^{20}$ protons on target. In the absence of neutrinooscillations, $205 \pm 17$ (syst.) events are expected to be detected and only58 muon neutrino event candidates are observed. A fit to the neutrino rate andenergy spectrum assuming three neutrino flavors, normal mass hierarchy and$\theta_{23}\leq \pi/4$ yields a best-fit mixing angle$\sin^2(2\theta_{23})=1.000$ and mass splitting $|\Delta m^2_{32}| =2.44 \times10^{-3}$ eV$^2$/c$^4$. If $\theta_{23}\geq \pi/4$ is assumed, the best-fitmixing angle changes to $\sin^2(2\theta_{23})=0.999$ and the mass splittingremains unchanged.

Measurement of Neutrino Oscillation Parameters from Muon Neutrino Disappearance with an Off-axis Beam