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

Abstract

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)(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 3 P0 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's also very interesting that the light quarks spin ∆u and ∆d in the Λ baryon are of small but negative values, which exactly vanish in the traditional three-quark model.

The quark orbital angular momentum of ground state octet baryons

“…2. As discussed explicitly in [67], the obtained baryon wave functions in the both the Set I and Set II could result in the meson-baryon sigma terms consistent with the predictions by other theoretical approaches, although the probabilities for the five-quark components in the two Sets are very different. And one may note that the upper limit of probabilities for the intrinsic five-quark components obtained in Set II of present model are larger than 50%, while these values are very close to those predicted in Refs.…”

“…And the explicit flavor, orbital, spin and color wave functions for the presently considered fivequark configurations have been given in Refs. [67].…”

“…In addition, the experimental data for decays of baryon resonances such as ∆(1232), P 11 (1440), S 11 (1535), S 11 (1650), D 13 (1520) and D 13 (1700) [59][60][61][62][63][64] can be also well reproduced by EχCQM. Very recently, the EχCQM has been applied to study the quark OAM of the proton and flavor-dependent axial charges of the ground state octet baryons [65][66][67]. It's shown that the singlet axial charge g (0)…”