# Multiparticle production and initial quasi-temperature from proton induced carbon collisions at $p_{Lab}=31$ GeV/$c$

## TL;DR

This study analyzes charged particle spectra from proton-carbon collisions at 31 GeV/c using a thermal model, revealing dependencies of temperature and other parameters on emission angle and target thickness.

## Contribution

It introduces a multisource thermal model analysis of proton-carbon collision data, extracting parameters like initial quasi-temperature and demonstrating their angular and positional dependencies.

## Key findings

- Effective temperature varies with emission angle.
- Initial quasi-temperature is derived from transverse momentum data.
- Model results agree with experimental measurements.

## Abstract

The momentum spectra of charged pions ($\pi^+$ and $\pi^-$) and kaons ($K^+$ and $K^-$), as well as protons ($p$), produced in the beam protons induced collisions in a 90-cm-long graphite target [proton-carbon ($p$-C) collisions] at the beam momentum $p_{Lab}=31$ GeV/$c$ are studied in the framework of a multisource thermal model by using Boltzmann distribution and Monte Carlo method. The theoretical model results are approximately in agreement with the experimental data measured by the NA61/SHINE Collaboration. The related free parameters (effective temperature, rapidity shifts, and fraction of non-leading protons) and derived quantities (average transverse momentum and initial quasi-temperature) under given experimental conditions are obtained. It is shown that the considered free parameters and derived quantities to be strongly dependent on emission angle over a range from 0 to 380 mrad and weakly dependent on longitudinal position (graphite target thickness) over a range from 0 to 90 cm.