Physics Potentials of the Hyper-Kamiokande Second Detector in Korea

TL;DR

The paper discusses the potential scientific benefits of adding a second Hyper-Kamiokande detector in Korea, which would enhance physics sensitivities due to longer baseline and greater overburden.

Contribution

It provides an overview and analysis of the physics potentials of the proposed second Hyper-Kamiokande detector in Korea, highlighting its advantages over the Japanese site.

Findings

Longer baseline improves neutrino oscillation measurements.

Greater overburden reduces background noise.

Enhanced sensitivity to astrophysical phenomena.

Abstract

Hyper-Kamiokande (Hyper-K) succeeds the very successful Super-K experiment and will consist of a large detector filled with 260~kton purified water and equipped with 40\% photo-coverage. Physics program of Hyper-K is broad, covering from particle physics to astrophysics and astronomy. The Hyper-K 1$^{st}$ detector will be built in Japan, and the 2$^{nd}$ detector is considered to be built in Korea because locating the 2$^{nd}$ detector in Korea improves physics sensitivities in most cases thanks to the longer baseline ($\sim$1,100~km) and larger overburden ($\sim$1,000~m) for Korean candidate sites. In this talk, we present overview and physics potentials of the Hyper-K 2$^{nd}$ detector in Korea.