The T2K experiment is a long-baseline neutrino oscillation experiment. Last year we started to take data with anti-neutrino beam. In this poster proceedings the first result of vμ disappearance analysis is shown. We fit the muon-like events observed at Super-Kamiokande when running in anti-neutrino mode to estimate the oscillation parameters of the PMNS model. We describe the analysis overview and present systematic errors, preliminary confidence intervals and best-fit points obtained with anti-neutrino mode data.
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