Chiral Symmetry and the Nucleon's Vector Strangeness Form Factors

Details Chiral Symmetry and the Nucleon's Vector Strangeness Form Factors Chiral Symmetry and the Nucleon's Vector Strangeness Form Factors

1996-07-12

arxiv.org/abs/nucl-th/9607021v1

Phys.Rev.C55:3066-3082,1997

Physics

Nuclear Physics

Nuclear Theory

LaTex 31 pages, four figures available from authors.

Scientific paper

10.1103/PhysRevC.55.3066

The nucleon's strange-quark vector current form factors are studied from the perspective of chiral symmetry. It is argued that chiral perturbation theory cannot yield a prediction for the strangeness radius and magnetic moment. Arrival at definite predictions requires the introduction of additional, model-dependent assumptions which go beyond the framework of chiral perturbation theory. A variety of such model predictions is surveyed, and the credibility of each is evaluated. The most plausible prediction appears in a model where the unknown chiral counterterms are identified with $t$-channel vector meson exchange amplitudes. The corresponding prediction for the mean square Dirac strangeness radius is $\langle r_s^2\rangle = 0.24$ fm$^2$, which would be observable in up-coming semileptonic determinations of the nucleon's strangeness form factors.

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