# Using world charged pion--nucleus scattering data to constrain an intranuclear cascade model

## TL;DR

This paper refines an intranuclear cascade model for pion-nucleus scattering, improving its accuracy and uncertainty estimates, which benefits neutrino experiments like T2K and Super-Kamiokande.

## Contribution

It develops a method to tune Final State Interaction models using scattering data, addressing data deficiencies and enabling better neutrino interaction simulations.

## Key findings

- The NEUT model is fitted to extensive pion-nucleus scattering data.
- Uncertainty estimates for the model are robust and well-characterized.
- The results are directly applicable to neutrino experiments using NEUT.

## Abstract

The NEUT intranuclear cascade model is described and fit to a large body of \pipm--nucleus scattering data. Methods are developed to deal with deficiencies in the available historical data, and robust uncertainty estimates are produced. The results are compared to a variety of simulation packages, and the data itself. This work provides a method for tuning Final State Interaction models, which are of particular interest to neutrino experiments that operate in the few-GeV energy region, and provides results which can be used directly by the T2K and Super-Kamiokande collaborations, for whom NEUT is the primary simulation package.