Sensitivity to the neutrino oscillation parameters in the Hyper-Kamiokande experiment

The Hyper-Kamiokande (Hyper-K) [1, 2] detector is a next generation underground water Cherenkov detector that will serve as the far detector of a long-baseline neutrino experiment (T2HK) located in Japan. T2HK is a natural extension of the very successful T2K experiment.The upgraded facilities at J-PARC will deliver an off-axis narrow band (≈0.6GeV) (anti)neutrino beam (750kW-1MW) directed to Hyper-K that will be used to measure the appearance and disappearance parameters with unprecedented precision as well as potentially discover CP violation in the lepton sector.If the mass hierarchy is known, Hyper-K is expected to determine the CP phase to better than 19 degrees for all possible values of δ_CP and CP violation can be determined at 3σ for 76% of the delta parameter space (considering 5 years exposure to neutrino beam produced by the 1.66 MW J-PARC proton synchrotron) [2]. (paper)