We report measurements by the T2K experiment of the parameters $ heta_{23}$
and $Delta m^{2}_{32}$ governing the disappearance of muon neutrinos and
antineutrinos in the three flavor neutrino oscillation model. Utilizing the
ability of the experiment to run with either a mainly neutrino or a mainly
antineutrino beam, the parameters are measured separately for neutrinos and
antineutrinos. Using $7.482 imes 10^{20}$ POT in neutrino running mode and
$7.471 imes 10^{20}$ POT in antineutrino mode, T2K obtained,
$sin^{2}( heta_{23})=0.51^{+0.08}_{-0.07}$ and $Delta m^{2}_{32} =
2.53^{+0.15}_{-0.13} imes 10^{-3}$eV$^{2}$/c$^{4}$ for neutrinos, and
$sin^{2}({overline{ heta}}_{23})=0.42^{+0.25}_{-0.07}$ and
${Deltaoverline{m}^2}_{32} = 2.55^{+0.33}_{-0.27} imes
10^{-3}$eV$^{2}$/c$^{4}$ for antineutrinos (assuming normal mass ordering). No
significant differences between the values of the parameters describing the
disappearance of muon neutrinos and antineutrinos were observed.
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