title: 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 (Deltas) of the nucleon in an SU(3) chiral potential model. We find that if the intermediate quark excited states are summed over in a proper way, i.e., summed up to a given energy instead of given radial and orbital quantum numbers, Deltas turns out to be almost independent of all the model parameters: quark masses and 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.
authors.affiliation: Department of Physics and Center for Theoretical Physics, Nanjing University, Nanjing 210093, China.
authors.forename: X B
authors.initials: XB
authors.lastname: Chen
authors.forename: X S
authors.initials: XS
authors.lastname: Chen
authors.forename: F
authors.initials: F
authors.lastname: Wang