Strange quark polarization of the nucleon: a parameter-independent prediction of the chiral potential model.
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.
Chen
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XB
Department of Physics and Center for Theoretical Physics, Nanjing University, Nanjing 210093, China.
Chen
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XS
Wang
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