# Status and challenges of neutrino cross sections

## TL;DR

This paper reviews the current understanding and challenges of neutrino-nucleus cross sections in the few-GeV energy range, emphasizing the importance of multinucleon emission for accurate neutrino energy reconstruction in oscillation experiments.

## Contribution

It provides a comprehensive overview of the status of neutrino cross sections, highlighting recent attention to multinucleon emission and its impact on systematic errors in neutrino oscillation measurements.

## Key findings

- Multinucleon emission significantly affects neutrino energy reconstruction.
- Current models often neglect multinucleon channels, leading to systematic uncertainties.
- Understanding cross sections is crucial for reducing errors in neutrino oscillation experiments.

## Abstract

Neutrino oscillations physics entered in the precision era. In this context accelerator-based neutrino experiments need a reduction of systematic errors to the level of a few percent. Today one of the most important sources of systematic errors are the neutrino-nucleus cross sections. The status of our knowledge of these cross sections in the different open channels in the few-GeV region, i.e. the quasielastic, the pion production and the multinucleon emission, is reviewed. Special emphasis is devoted to the multinucleon emission channel, which attracted a lot of attention in the last few years. It is crucial to properly reconstruct the neutrino energy which enters the expression of the oscillation probability. This channel was not included in the generators used for the analyses of the neutrino cross sections and oscillations experiments.