Investigations on the flavor-dependent axial charges of the octet baryons

We have investigated the axial charges of the ground octet baryons within the extended chiral constituent quark model, where all the possible compact five-quark Fock components qqq(q (q) over bar)(q = u, d, s) in the baryons are considered. The transition couplings between the three- and five-quark components in the baryons are assumed to be via the P-3(0) mechanism, which could reproduce the sea asymmetry in proton very well. The numerical results for the flavor-dependent axial charges of the octet baryons are comparable to those predicted by other theoretical approaches. It is shown that the singlet axial charges of the octet baryons, which should indicate total baryons spin arising from the spin of the quarks, fall in the range 0.45-0.75 in present model. This is in consistent with the predictions by lattice QCD and chiral perturbation theory. It is also very interesting that the light quarks spin Delta u and Delta d in the Lambda baryon are of small but negative values, which exactly vanish in the traditional three-quark model.

Automated summary

In this study, the axial charges of octet baryons were investigated using the extended chiral constituent quark model, taking into account all possible five-quark components. The numerical results were comparable to predictions from other theoretical approaches. Additionally, it was found that the light quark spins Delta u and Delta d in the Lambda baryon were of small but negative values, which were absent in the traditional three-quark model.