Observation of ν_μ→ν_e Oscillation in the T2K Experiment

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Springer, Dec 24, 2015 - Science - 199 pages

In this thesis the author contributes to the analysis of neutrino beam data collected between 2010 and 2013 to identify νμ→νe 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 νμ→νe oscillation in the T2K (Tokai to Kamioka) experiment is presented and a new constraint on δCP is obtained. This measurement and the analysis establish, at greater than 5σ significance, the observation of νμ→νe oscillation for the first time in the world. Combining the T2K νμ→νe 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 δCP at the 90% confidence level is obtained. This constraint on δCP is an important step towards the discovery of CP violation in the lepton sector.

 

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Contents

1 Introduction
1
2 Overview of the T2K Experiment
19
3 The FineGrained Detector
35
4 Pion Interaction Measurement at TRIUMF M11 Beamline
51
5 Extraction of Pion Absorption and Charge Exchange Cross Section
61
6 Improvement of Pion Interaction Model
76
7 Monte Carlo Simulation for the Oscillation Analysis
89
8 Near Detector Measurement
101
10 Oscillation Analysis and Results
121
11 Conclusion
154
Appendix ASimulation and the Systematic Errorsin the Pion Interaction Measurement
159
Appendix BNeutrino Flux and Cross Section Uncertainties
173
Appendix CND280 Data Fit
183
Appendix DSK Efficiency Error
186
Appendix EComparison with 2012 νe Appearance Analysis
191
Curriculam Vitae
199

9 Far Detector Measurement
113

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About the author (2015)

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

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