Axial Charges of Octet Baryons in Two-flavor Lattice QCD

TL;DR

This study computes axial charges of octet baryons using two-flavor lattice QCD, revealing weak quark-mass dependence and small SU(3) symmetry breaking, thus enhancing understanding of baryon structure and interactions.

Contribution

It extends previous lattice QCD work to include various axial charges and meson-baryon coupling constants, providing new insights into SU(3) symmetry breaking effects.

Findings

Axial charges show weak quark-mass dependence.

SU(3) flavor symmetry breaking is small at studied quark masses.

Includes calculations of meson-baryon coupling constants.

Abstract

We evaluate the strangeness-conserving $N N$, $\Sigma\Sigma$, $\Xi\Xi$, $\Lambda\Sigma$ and the strangeness-changing $\Lambda N$, $\Sigma N$, $\Lambda\Xi$, $\Sigma\Xi$ axial charges in lattice QCD with two flavors of dynamical quarks and extend our previous work on pseudoscalar-meson-octet-baryon coupling constants so as to include $\pi\Xi\Xi$, $K\Lambda\Xi$ and $K\Sigma\Xi$ coupling constants. We find that the axial charges have rather weak quark-mass dependence and the breaking in SU(3)-flavor symmetry is small at each quark-mass point we consider.