In this thesis the author contributes to the analysis of neutrino beam data collected between 2010 and 2013 to identify e events at the Super-Kamiokande detector. In particular, the author improves the pionnucleus interaction uncertainty, which is one of the dominant systematic error sources inT2K neutrino oscillation measurement. In the thesis, the measurement of e * oscillation in the T2K (Tokai to Kamioka) experiment is presented and a new constraint on CP is obtained. This measurement and the analysis establish, at greater than 5 significance, the observation of e oscillation for the first time in the world. Combining the T2K e oscillation measurement with the latest findings on oscillation parameters including the world average value of 13 from reactor experiments, the constraint on the value of CP at the 90% confidence level is obtained. This constraint on CP* is an important step towards the discovery of CP violation in the lepton sector.

Nominated as an outstanding contribution by Kyoto University's Physics Department in 2013 Provides a detailed description of the fine-grained Summarizes the details of the complicated neutrino oscillation analysis method, including the prediction of neutrino flux and cross section Includes supplementary material: sn.pub/extras

Autorentext
Dr. Kei Ieki
Kyoto University
Department of Physics
iekikei@gmail.com

Inhalt
Introduction.- Overview of the T2K experiment.- The Fine-Grained Detector.- Pion Interaction measurement at TRIUMF M11 Beamline.- Extraction of Pion Absorption and Charge Exchange Cross Section.- Improvement of pion interaction model.- Monte Carlo Simulation for the Oscillation Analysis.- Near Detector Measurement.- Far Detector Measurement.- Oscillation Analysis and Results.- Conclusion.