Selection of the Neutrino Induced Charged Current Single Pion Events with the T2K Near Detector

In order to calculate the neutrino induced charged current single pion production on water a two-track event selection in the T2K near detector has been developed. High purity muon tagging was done by requiring its minimum range in the detector and a negative charge. Pion candidate was selected by applying dE/dx based particle identification technique. Event selection has been applied to the simulated data from water-in and water-out detector running modes and preliminary values of 72$\%$ and 77$\%$ of the observable CC1$\pi$ purities were achieved. Preliminary results on the event selection optimization and performance as well as on the systematic errors related to the detector modeling are presented.