Dr Antonin Vacheret (University of Oxford)
Single \pi^0 production is one of the most important backgrounds in the \nu_\mu->\nu_e appearance measurement in T2K. Large uncertainties in this production rate make it difficult to predict. Therefore, measurement at the near detector (ND280) is required to constrain efficiently not only the background prediction at the far detector (Super-K) but also at the near detector to improve knowledge of the intrinsic \nu_e contamination within the beam. We present an analysis based on Monte Carlo simulation of neutral current (NC) single \pi^0 production in the tracker region of ND280. NC-1\pi^0 are selected using a specific two-gamma signature in the tracker. The first gamma from the pi0 decay is reconstructed by selecting an e^+/e^- pair starting in the Fine-Grained target Detector (FGD) and extending into the TPC, where the leptons can be identified and their momentum measured accurately. The second gamma is then selected in time in the calorimeter modules surrounding the tracker. We will present in detail selections cuts, efficiency and purity of the selection. A projection of the expected number of single pi0 candidates that are expected for 3 x 10E20 POT exposure (run I+II+III data) will be given.
Dr Helen O'Keeffe (University of Oxford)