Departmental Oral Examination (Thesis Title: Searching for Multi-nucleon Processes in Neutrino Interactions by Proton Identification in the Fine-Grained Detectors for T2K")

Event Date and Time: 
Mon, 2018-03-12 14:30 - 16:30
Room 309, Hennings Building
Local Contact: 
Physics and Astronomy, UBC
Intended Audience: 

T2K is an accelerator-based neutrino experiment designed to observe neutrino oscillations with a baseline of 295 km across Japan from Tokai to Kamioka. Its main goal is to measure oscillation parameters (θ23, Δm232 and θ13) through νμμ) disappearance and νee) appearance channels. It also has begun to provide measurements of CP violation in the neutrino sector combining all four neutrino oscillation channels. However, the precision required for these experiments have resulted in the need to reduce challenging systematic uncertainties. Among all the uncertainties, the largest contribution comes from the neutrino interaction model uncertainties, where nuclear effects are poorly understood. As neutrinos typically interact on nucleons that are almost always contained within nuclei, one immediately has to confront nuclear effects. Nuclear effects alter the kinematics of out-going particles from neutrino scatterings, hence affect the neutrino oscillation measurements. Therefore it is crucial to understand the nuclear effects in these neutrino interaction.

This dissertation describes the measurement of neutrino-nucleus interactions with no final state pion and at least one final state protons. Differential cross sections are measured as a function of kinematic variables, which utilizes both muon and protons. An iterative unfolding technique is used to extract the cross sections. By providing unfolded and efficiency corrected results, this measurement can be more readily compared to theoretical models to allow a better understanding of the impact nuclear effects, thereby providing valuable constraints on the systematic uncertainties associated with neutrino oscillation measurements for both T2K and other accelerator-based
neutrino experiments.

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