Comparisons of electric charge and axial charge meson cloud distributions in the PCQM

TL;DR

This paper investigates the spatial distributions of electric and axial charges in the meson cloud surrounding nucleons using the perturbative chiral quark model, revealing similarities and differences in their spatial profiles.

Contribution

It provides a comparative analysis of electric and axial charge distributions in the meson cloud within the PCQM framework, highlighting their spatial characteristics.

Findings

Electric and axial charge distributions of the three-quark core are identical.

Meson cloud magnetic charge distributions peak around 2 GeV^{-1}.

Axial charge meson cloud mainly resides inside the three-quark core.

Abstract

The meson cloud distributions in $r$-space are extracted from the nucleon electromagnetic and axial form factors which are derived in the perturbative chiral quark model. The theoretical results indicate that the electric charge and axial charge distributions of the three-quark core are the same, the magnetic charge distributions of the meson cloud and three-quark core are more or less in the same region and peak at distances of around 2 $\rm GeV^{-1}$, but the axial charge meson cloud distributes mainly inside the three-quark core.