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

X. B. Chen·X. S. Chen·Amand Faessler·Th. Gutsche·F. Wang
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Abstract

We perform a one-loop calculation of the strange quark polarization ($Δs$) 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, $Δs$ 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.

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X. B. Chen, X. S. Chen, Amand Faessler, Th. Gutsche, F. Wang. 2000-05-19. Strange quark polarization of the nucleon: A parameter-independent prediction of the chiral potential model. https://doi.org/10.1103/physrevlett.87.012001

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