Speaker
Description
T2K experiment measures the neutrino oscillation parameters by observing $\nu_\mu$ ($\bar{\nu}_\mu$) disappearance and $\nu_e$ ($\bar{\nu}_e$) appearance from a $\nu_\mu$ ($\bar{\nu}_\mu$) beam. The events are observed in the near detector ND280 and the far detector Super-Kamiokande (SK) situated at 280 m and 295 km respectively from the beam production target. In SK, the products of $\nu$ and $\bar{\nu}$ interactions produce Cherenkov rings. Since charged current quasi-elastic (CCQE) interactions are the most dominant in the T2K energy region, single ring CC events are used for analyses. Resonant 1$\pi$ production which is the second dominant CC interaction in this energy region can be included to increase statistics. The addition of CC $\nu_\mu1\pi^+$ samples are expected to improve the precision on $\sin^2\theta_{23}$ and $|\Delta{m^2}_{32}|$. Similarly CC $\nu_e1\pi^+$ events will improve the sensitivity to the leptonic CP phase $\delta_{CP}$. These new samples will have multi-ring topology. Studies on the selection of CC $1\pi$ like events accumulated from forward horn current (FHC) operation are performed for $\nu_\mu$ and $\nu_e$ samples.