Analysis of pC-interactions at Momentum of 4.2 GeV/c Within Framework of FRITIOF and Cascade Models

TL;DR

This study compares experimental data on meson and proton production in proton-carbon collisions at 4.2 GeV/c with models, incorporating non-nucleonic degrees of freedom in the FRITIOF model for improved accuracy.

Contribution

It introduces the first inclusion of non-nucleonic degrees of freedom in the FRITIOF model to better describe collision outcomes.

Findings

Good agreement between experimental data and the modified FRITIOF model

Parameter Q effectively indicates collision centrality

Non-nucleonic degrees of freedom improve model predictions

Abstract

Experimental data on multiplicities and kinematical characteristics of $\pi^-$, $\pi^+$ mesons and protons in the interactions of protons with carbon nucleus at momentum 4.2 GeV/c in a dependence of collision centrality are analyzed. Parameter Q which is a difference between multiplicities of positive and negative charged particles without multiplicity of slow protons with momentum less than 0.3 GeV/c in an event, is taken as a criteria of collision centrality. The experimental data on events with different centrality are compared with predictions of the cascade-evaporation model and the modified FRITIOF model. For the first time, non-nucleonic degrees of freedom in nuclei ($\Delta ^+, \Delta ^0 $ isobars) are taken into account in the FRITIOF model, and a commonly good description of the secondary particles characteristics is reached.