Observation of ν_μ ν_e Oscillation in the T2K Experiment

By: Kei Ieki

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Synopsis: In this thesis theauthor contributes to the analysis of neutrino beam data collected between 2010and 2013 to identify ΝΜ⇒Νe events at the Super-Kamiokande detector. In particular,the author improves the pion-nucleus interaction uncertainty, which is one ofthe dominant systematic error sources in T2K neutrino oscillation measurement. In the thesis, the measurement of ΝΜ⇒Νe oscillation in the T2K (Tokai toKamioka) experiment is presented and a new constraint on ΔCP is obtained. Thismeasurement and the analysis establish, at greater than 5Σ significance, theobservation of ΝΜ⇒Νe oscillation for the first time in the world. Combiningthe T2K ΝΜ⇒Νe oscillation measurement with the latest findings on oscillationparameters including the world average value of &thΗ13 from reactor experiments,the constraint on the value of ΔCP at the 90% confidence level is obtained. This constraint on ΔCP is an important step towards the discovery of CPviolation in the lepton sector.