Lamont, Iain and Nowak, Jaroslaw (2016) Neutrino interaction cross-section ratios measured with the T2K near detector. PhD thesis, Lancaster University.
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Abstract
The T2K near detector, ND280, is used to compare electron and muon neutrino interaction cross sections by measuring the ratio of the Charged-Current Quasi-Elastic (CCQE or CC0π) to the total Charged-Current (CC) interaction cross section for both flavours. The double ratio of these is taken to study the differences between electron and muon neutrino interactions. A charged-current interaction with no final state pions is also studied in place of the CCQE topology to provide a less model dependent result. In either case, no significant deviation from the NEUT and GENIE Monte Carlo generators was found showing that the current models accurately predict the relative amount of CCQE and CC0π to CC interactions for electron and muon neutrinos. A series of studies are presented regarding the ND280 ECals. An energy-equalisation calibration is applied to bars in the ECals and found to considerably improve the consistency of the detector. In addition, the rate of degradation of the ECal scintillator bars was found to be well modelled by an exponential decay with a ≈ 3% loss of energy recorded per year. The systematic uncertainties associated with matching tracks between a TPC and an ECal are calculated and found to be ≈ 1%.