Hyper-Kamiokande: Towards a measurement of CP violation in lepton sector

TL;DR

This paper presents a sensitivity study of the Hyper-Kamiokande experiment, demonstrating its potential to measure the CP-violating phase in the lepton sector with high precision and significance.

Contribution

It provides the first detailed sensitivity analysis showing Hyper-Kamiokande's capability to determine the CP phase and establish CP violation with specified confidence levels.

Findings

CP phase can be measured with better than 21° precision

CP violation can be established with >3σ significance for 78% of parameter space

Hyper-Kamiokande's sensitivity surpasses previous experiments

Abstract

We present the latest Hyper-Kamiokande sensitivity study showing that, with a total exposure of 13 MW $\times 10^{7}$ seconds integrated beam power, the CP phase - $\delta_{CP}$ - can be determined better than 21 degrees for all possible values of $\delta_{CP}$ and CP violation can be established with a significance of more than 3$\sigma$ (5$\sigma$) for 78% (62%) of the $\delta_{CP}$ parameter space.