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

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

2000-02-18

arxiv.org/abs/hep-ph/0002200v2

Phys.Rev.Lett. 87 (2001) 012001

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

10.1103/PhysRevLett.87.012001

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.

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