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In this thesis theauthor contributes to the analysis of neutrino beam data collected between 2010and 2013 to identify nimi nie events at the Super-Kamiokande detector. In particular,the author improves the pion-nucleus interaction uncertainty, which is one ofthe dominant systematic error sources inT2K neutrino oscillation measurement.In the thesis, the measurement of nimi nie oscillation in the T2K (Tokai toKamioka) experiment is presented and a new constraint on dCP is obtained. Thismeasurement and the analysis establish, at greater than 5s significance, theobservation of nimi nie oscillation for the first time in the world. Combiningthe T2K nimi nie oscillation measurement with the latest findings on oscillationparameters including the world average value of th13 from reactor experiments,the constraint on the value of dCP at the 90% confidence level is obtained.This constraint on dCP is an important step towards the discovery of CPviolation in the lepton sector.
List of contents
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.
About the author
Dr. Kei Ieki
Kyoto University
Department of Physics
iekikei@gmail.com
Summary
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 inT2K 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.
