arXiv:1409.4943·v1·High Energy Physics — Phenomenology

Axial-vector form factors for the low lying octet baryons in the chiral quark constituent model

We have calculated the axial-vector form factors of the low lying octet baryons ( $N$ , $Σ$ , $Ξ$ and $Λ$ ) in the chiral constituent quark model ( $χ$ CQM). In particular, we have studied the implications of chiral symmetry breaking and SU(3) symmetry breaking for the singlet ( $g_{A}^{0}$ ) and non-singlet ( $g_{A}^{3}$ and $g_{A}^{8}$ ) axial-vector coupling constants expressed as combinations of the spin polarizations at zero momentum transfer. The conventional dipole form of parametrization has been used to analyse the $Q^{2}$ dependence of the axial-vector form factors ( $G_{A}^{0} (Q^{2})$ , $G_{A}^{3} (Q^{2})$ and $G_{A}^{8} (Q^{2})$ ). The total strange singlet and non-singlet contents ( $G_{s}^{0} (Q^{2})$ , $G_{s}^{3} (Q^{2})$ and $G_{s}^{8} (Q^{2})$ ) of the nucleon determining the strange quark contribution to the nucleon spin ( $Δ s$ ) have also been discussed.

Comments: 20 pages, 3 figures. To appear in PRD

Axial-vector form factors for the low lying octet baryons in the chiral quark constituent model

Abstract

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