Axial transition form factors of octet baryons in the perturbative chiral quark model

TL;DR

This paper investigates axial transition form factors of octet baryons using the perturbative chiral quark model, showing good agreement with experimental and lattice data, and highlighting the roles of the three-quark core and meson cloud.

Contribution

It introduces a comprehensive calculation of axial form factors including excited states in the perturbative chiral quark model, providing new insights into their behavior and underlying structure.

Findings

Form factors follow a dipole-like behavior dominated by the three-quark core.

Meson cloud contributions are significant but produce flat effects.

Excited states have limited impact as higher-order corrections.

Abstract

We study the axial transition form factors $G_A^{B\to B'}(Q^2)$ as well as the axial charges $g_A^{B\to B'}$ of the octet baryons in the perturbative chiral quark model~(PCQM) with including both the ground and excited states in the intermediate quark propagators. The PCQM results on the $G_A^{B\to B'}(Q^2)$ and the $g_A^{B\to B'}$ are found in good agreement with the existing experimental data and the lattice-QCD values. The study figures out that the $G_A^{B\to B'}(Q^2)$ for all transitions behave in the dipolelike form, which is dominantly caused by the three-quark core. The meson cloud with the ground-state quark propagator also plays an extremely important role but results in a flat contribution. The excited-state quark propagator contributing to the $G_A^{B\to B'}(Q^2)$ could be regarded as the higher order correction and it is very limited.