Measurement of Neutral Current 1$\pi^0$ production in $\nu_{\mu}$ interaction on water with the Pi0 Detector at T2K

The T2K Experiment is a long baseline neutrino experiment which looks for $\nu_e$ appearance in $\nu_{\mu}$ beam to measure the lepton sector mixing angle $\theta_{13}$ as it's primary goal. It has a baseline of 295 km, going from Tokai on the east coast to Kamioka mine on the west coast of Japan. The far detector, Super Kamiokande, is a Water Cherenkov detector. One of the dominant backgrounds for the far detector in the oscillation measurement is the Neutral Current Single $\pi^0$ (NC1$\pi^0$) interaction. In order to constrain this background, the $\pi^0$ detector (P$\emptyset$D) was placed in the near detector complex, 280 meters from the beam origin. The P$\emptyset$D was constructed with a water target that can be filled and drained in order to perform a statistical subtraction to measure various cross sections on-water. This analysis presents the on-water NC1$\pi^0$ rate measurement with a neutrino beam energy less than 1 GeV. The on-water interactions were extracted by comparing the interactions of water-in configuration with water-out configuration. The calculation of NC1$\pi^0$ absolute cross-section on water is on-going, which when completed would be the first such measurement in the world.