Speaker
Description
The T2K experiment is a long-baseline neutrino oscillation experiment aiming to measure CP-violation in the lepton sector. So far, T2K has shown results that disfavor CP conservation at a confidence level of 90%. One of the major systematic uncertainties in the current oscillation analysis arises from the uncertainty in neutrino cross-sections. To reduce these uncertainties and perform more precise measurements of neutrino oscillations, a part of the near detector complex, ND280 was recently replaced with three upgraded detectors : Super fine-grained detector, High-angle-TPC and Time of flight detector.
To reconstruct electron-neutrino events in the upgraded ND280, we have developed dedicated methods : vertex finding, electromagnetic shower identification and energy reconstruction, and the rejection of background events, exemplified by photons. It is essential to characterize the performance of these methods including the assessment of systematic uncertainties using actual data for future cross-section measurement. This poster reports on the results of a comparison between data and simulation using electron and photon control samples. In addition, a preliminary electron-neutrino event selection results in the simulations are presented.