# First neutrino event detection with nuclear emulsion at J-PARC neutrino beamline

## TL;DR

This paper reports the first detection and analysis of neutrino events using nuclear emulsion at J-PARC, demonstrating the technique's potential for precise neutrino interaction measurements in the sub-multi GeV energy range.

## Contribution

It introduces the first systematic neutrino event analysis with nuclear emulsion at J-PARC, showcasing the technique's capability for detailed neutrino interaction studies.

## Key findings

- First neutrino event detection with nuclear emulsion at J-PARC.
- Successful systematic analysis of neutrino interactions in the emulsion detector.
- Demonstration of nuclear emulsion's potential for future neutrino physics experiments.

## Abstract

Precise neutrino--nucleus interaction measurements in the sub-multi GeV region are important to reduce the systematic uncertainty in future neutrino oscillation experiments. Furthermore, the excess of ${\nu_e}$ interactions, as a possible interpretation of the existence of a sterile neutrino has been observed in such an energy region. The nuclear emulsion technique can measure all the final state particles with low energy threshold for a variety of targets (Fe, C, H${_2}$O, and so on). Its sub-$\mu$m position resolution allows measurements of the ${\nu_e}$ cross-section with good electron/gamma separation capability. We started a new experiment at J-PARC to study sub-multi GeV neutrino interactions by introducing the nuclear emulsion technique. The J-PARC T60 experiment has been implemented as a first step of such a project. Systematic neutrino event analysis with full scanning data in the nuclear emulsion detector was performed for the first time. The first neutrino event detection and its analysis is described in this paper.