"First Results of Electron-neutrino Appearance Measurement at NOvA"

NOvA is a long-baseline accelerator-based neutrino oscillation experiment that is optimized for nu_e measurements. It uses the upgraded NuMI beam from Fermilab and measures electron-neutrino appearance and muon-neutrino disappearance at its Far Detector in Ash River, Minnesota. The nu_e appearance analysis at NOvA aims to resolve the neutrino mass hierarchy problem and to constrain the CP-violating phase. This talk will present the first measurement of electron-neutrino appearance in NOvA based on its first year’s data performed in 2015. This measurement provides solid evidence of nu_e oscillation with the NuMI beam line and some hints on mass-hierarchy and  CP. The expectations for NOvA’s second year and beyond will also be discussed.