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Muon neutrino charged current quasi-elastic interactions in the T2K off-axis near detector

AuthorsMonfregola, Laura
AdvisorCervera Villanueva, Anselmo
KeywordsFísica de Partículas
Issue Date27-Oct-2015
PublisherCSIC-UV - Instituto de Física Corpuscular (IFIC)
AbstractT2K (Tokai-to-Kamioka) is a long-baseline neutrino oscillation experiment, currently operating in Japan, built to precisely measure the mixing angle θ13, using the electron neutrino appearance channel, and to refine the measurement of the atmospheric parameters using the muon neutrino disappearance channel. An intense high purity muon neutrino beam, produced at the J-PARC facility, is directed toward the Super-Kamiokande (SK) water Cherenkov detector, located 295 km away. The off-axis near detector, ND280, measures the neutrino beam properties and the neutrino interaction cross-section and kinematics before the oscillation, in order to predict the neutrino flux and the relevant neutrino interactions at SK. This thesis work provides a strategy for selecting muon neutrino-induced charged current quasi-elastic (CCQE) interactions in ND280. The results of the analysis with real data and a comparison with the NEUT Monte Carlo (MC) prediction are provided. A brief qualitative study on the impact of proton final state interactions (FSI) on the selection is also presented. Different CCQE topologies, depending on whether only the muon or both the muon and the proton have been reconstructed and on the detectors crossed by the selected tracks, have been studied. The relevant detector systematic uncertainties have been estimated for each selected sample. A total of 11026 CCQE candidate events have been selected in the real data sample (corresponding to a total of 1.58 e20 protons on target): 7629 events correspond to the one-track sample; 3397 events correspond to the two-track samples. The number of selected events predicted by the MC for the one-track sample is slightly higher than that obtained when the study was performed on real data. On the other hand, the MC prediction is slightly lower than the data result for the two-track samples. These results, together with the study on the impact of proton FSI on the selection, suggest discrepancies between the FSI simulation in NEUT and real data, causing the proton produced in the neutrino-nucleus interaction to escape from the nucleus less frequently in the MC than in data. The results of this thesis work have been used to extract a CCQE cross- section on Carbon.
Description246 páginas. Tesis Doctoral del Departamento de Física Atómica, Molecular y Nuclear de la Universidad de Valencia y del Instituto de Física Corpuscular (IFIC).
Appears in Collections:(IFIC) Tesis
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