Observation of ν_μ→ν_e Oscillation in the T2K Experiment

In this thesis the author contributes to the analysis of neutrino beam data collected between 2010 and 2013 to identify ν_μ→ν_e  events at the Super-Kamiokande detector. In particular, the author improves the pion–nucleus interaction uncertainty, which is one of the dominant systematic error sources in T2K neutrino oscillation measurement. In the thesis, the measurement of ν_μ→ν_e   oscillation in the T2K (Tokai to Kamioka) experiment is presented and a new constraint on δ _CP  is obtained. This measurement and the analysis establish, at greater than 5σ significance, the observation of ν_μ→ν_e  oscillation for the first time in the world. Combining the T2K ν_μ→ν_e  oscillation measurement with the latest findings on oscillation parameters including the world average value of θ13 from reactor experiments, the constraint on the value of δ _CP  at the 90% confidence level is obtained. This constraint on δ _CP  is an important step towards the discovery of CP violation in the lepton sector.