Construction of new hybrid CC1π⁺ sample for the SK detector error estimation

In the energy region of the T2K (Tokai to Kamioka) beam, which is peaked around 0.6 GeV, Charged Current 1 π⁺ production (CC1π⁺) is a dominant channel besides Charged Current Quasi-elastic (CCQE) interaction. Consequently, T2K plans to include CC1π⁺ channel as a signal channel. An evaluation of the Super Kamiokande detector related systematic errors on CC1π⁺ needs to be done. A new hybrid sample is constructed, as it was successfully used for the evaluation of neutral current π⁰ background in the SK detector in previous oscillation analyses. In this proceeding, we describe how the atmospheric neutrino data in SK enabled the construction of a CC1π⁺ hybrid sample and the possibility to apply the results to the systematic error estimation.