Strange quark polarization of the nucleon: A parameter-independent prediction of the chiral potential model

Abstract

We perform a one-loop calculation of the strange quark polarization ($\Delta s$) of the nucleon in a SU(3) chiral potential model. We find that if the intermediate excited quark states are summed over in a proper way, i.e., summed up to a given energy instead of given radial and orbital quantum numbers, $\Delta s$ turns out to be almost independent of {\em all} the model parameters: quark masses, scalar- and vector-potential strengths. The contribution from the quark-antiquark pair creation and annihilation ``$Z$'' diagrams is found to be significant. Our numerical results agree quite reasonably with experiments and lattice QCD calculations.

arXiv comment4 pages revtex, 5 eps figures; more extensive model parameters are studied

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Cited by in corpus (2)

• Extraction of Spin-Dependent Parton Densities and Their Uncertainties
• Tensor charge and anomalous magnetic moment correlation