# Study of charged hadron multiplicities in charged-current neutrino-lead interactions in the OPERA detector

## TL;DR

This paper analyzes charged hadron multiplicities in neutrino-lead interactions within the OPERA detector, providing detailed data to validate Monte Carlo models and exploring scaling behaviors across kinematic regions.

## Contribution

It offers the first detailed measurements of charged hadron multiplicities and their dispersion in neutrino-lead interactions, including KNO scaling analysis.

## Key findings

- Charged hadron multiplicities vary with kinematic regions.
- KNO scaling observed in certain kinematic conditions.
- Data useful for Monte Carlo validation.

## Abstract

The OPERA experiment was designed to search for $\nu_{\mu} \rightarrow \nu_{\tau}$ oscillations in appearance mode through the direct observation of tau neutrinos in the CNGS neutrino beam. In this paper, we report a study of the multiplicity of charged particles produced in charged-current neutrino interactions in lead. We present charged hadron average multiplicities, their dispersion and investigate the KNO scaling in different kinematical regions. The results are presented in detail in the form of tables that can be used in the validation of Monte Carlo generators of neutrino-lead interactions.