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We report measurements by the T2K experiment of the parameters $\theta_{23}$and $\Delta m^{2}_{32}$ governing the disappearance of muon neutrinos andantineutrinos in the three flavor neutrino oscillation model. Utilizing theability of the experiment to run with either a mainly neutrino or a mainlyantineutrino beam, the parameters are measured separately for neutrinos andantineutrinos. Using $7.482 \times 10^{20}$ POT in neutrino running mode and$7.471 \times 10^{20}$ POT in antineutrino mode, T2K obtained,$\sin^{2}(\theta_{23})=0.51^{+0.08}_{-0.07}$ and $\Delta m^{2}_{32} =2.53^{+0.15}_{-0.13} \times 10^{-3}$eV$^{2}$/c$^{4}$ for neutrinos, and$\sin^{2}({\overline{\theta}}_{23})=0.42^{+0.25}_{-0.07}$ and${\Delta\overline{m}^2}_{32} = 2.55^{+0.33}_{-0.27} \times10^{-3}$eV$^{2}$/c$^{4}$ for antineutrinos (assuming normal mass ordering). Nosignificant differences between the values of the parameters describing thedisappearance of muon neutrinos and antineutrinos were observed.

Updated T2K measurements of muon neutrino and antineutrino disappearance using 1.5e21 protons on target