Further study of neutrino oscillation with two detectors in Kamioka and Korea

TL;DR

This study enhances the understanding of electron neutrino appearance using two detectors at different oscillation maxima, analyzing background discrimination, detector coverage effects, and sensitivity to CP violation and mass hierarchy.

Contribution

It introduces improved likelihood-based analysis methods and detailed simulations for a two-detector neutrino experiment at Kamioka and Korea.

Findings

Likelihood efficiency varies with detector photo-coverage.

Neutral current background estimation is refined through detailed simulations.

Sensitivity to CP violation and mass hierarchy depends on off-axis angle.

Abstract

This paper updates and improves the study of electron neutrino appearance in the framework of two far detectors at different oscillation maxima, specifically, Tokai-To-Kamioka-to-Korea. We used a likelihood based on reconstructed quantities to distinguish charged current $\nu_e$ interactions from neutral current background. We studied the efficiency of the likelihood for a 20% photo-coverage in comparison of a 40% photo-coverage. We used a detailed neutrino event simulation to estimate the neutral current background. With these analysis tools we studied the sensitivity of the proposed experiment to CP violation and mass hierarchy as a function of the off-axis angle.