Leading/nonleading charm production asymmetry in $\Sigma^-p$ interactions

TL;DR

This paper investigates charm meson production asymmetries in $ m \Sigma^- m p$ interactions at high energy, comparing the Quark-Gluon String Model with perturbative QCD calculations to understand leading and nonleading particle spectra.

Contribution

It demonstrates that the Quark-Gluon String Model can effectively describe charm asymmetries in $ m \Sigma^- m p$ interactions, including sea charm contributions, aligning with previous $ m \pi^- m A$ results.

Findings

QGSM fits the asymmetry data well

Sea charm quarks influence the asymmetry patterns

QGSM results are comparable to perturbative QCD calculations

Abstract

The asymmetries between the spectra of leading and nonleading charmed mesons measured in $\Sigma^-A$ interactions at $p_L$= 340 GeV/c in the WA89 experiment are described in the framework of Quark-Gluon String Model. There are two versions of the model under consideration: one of them includes the sea charm quark-antiquark pairs and the other one does not. It's shown that the asymmetries between $D^-$ and $D^+$-meson spectra and between $D_s^-$ and $D^+_s$- meson spectra can be fitted by QGSM curves obtained with the same parameters as charm asymmetry in $\pi^-A$ experiments described in previous studies. The QGSM results are compared with the calculations in the next-to-leading approximation of perturbative QCD approach carried out by the other authors.