Axial Charges of Octet Baryons in Two-flavor Lattice QCD

Abstract

We evaluate the strangeness-conserving $NN$, $\Sigma \Sigma$, $\Xi \Xi$, $\Lambda \Sigma$ 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.

Comments: 6 pages, 6 figures. Added discussions and a figure; version to appear in Physics Letters B