Study of the energy reconstruction in Super-Kamiokande and optimization of the T2K oscillation analysis

This thesis presents an analysis of the energy resolution in the T2K (Tokai to Kamioka) experiment, in particular at the Super-Kamiokande (SK). The T2K experiment, designed to study neutrino oscillations, employs the SK detector to measure neutrino interactions. Accurate energy reconstruction is crucial for understanding these interactions and improving the precision of oscillation parameter measurements. By optimizing energy resolution, this study aims to enhance the accuracy of neutrino energy measurements, contributing to a deeper understanding of neutrino properties and behavior.