# The feasibility study of the long-baseline neutrino oscillation experiment at the SUNLAB laboratory in Poland

## TL;DR

This study assesses the feasibility of establishing a long-baseline neutrino oscillation experiment at SUNLAB in Poland, involving a CERN-produced neutrino beam and a large liquid argon detector to explore CP violation.

## Contribution

It presents a detailed feasibility analysis of a new underground laboratory at SUNLAB for neutrino experiments, including sensitivity estimates for CP violation detection.

## Key findings

- The experiment could cover 58-60% of the CP phase space at 3σ after 10 years.
- The setup can reach 5σ significance for maximal CP violation.
- The study supports SUNLAB as a viable site for advanced neutrino research.

## Abstract

The feasibility study of an underground laboratory in the Polkowice -Sieroszowice mine in Poland (SUNLAB) as a host of a far detector in a long-baseline neutrino oscillation experiment was performed. The SUNLAB location was previously studied under the LAGUNA FP7 project as a location for the underground multipurpose laboratory. The complementary study of the long-baseline neutrino experiment presented in this paper was performed as a continuation of this idea. A neutrino beam produced at CERN and a far LAr-TPC detector hosted in the SUNLAB laboratory were simulated. The sensitivity of such an experiment for the determination of the CP symmetry violation in the neutrino sector was calculated. The experiment at SUNLAB equipped with the 100 kton LAr TPC detector after 10 years of data taking can give the coverage of {\delta}CP parameter space of 58% (60%) for the normal (inverted) neutrino mass hierarchy at 3{\sigma} level in both cases reaches 5{\sigma} level in case of the maximal violation.