Generalized polarizabilities of the proton in a constituent quark model revisited

Details Generalized polarizabilities of the proton in a constituent quark model revisited Generalized polarizabilities of the proton in a constituent quark model revisited

2000-08-23

arxiv.org/abs/nucl-th/0008046v1

Phys.Rev.C63:025205,2001

Physics

Nuclear Physics

Nuclear Theory

38 pages, 7 figures, Latex, using RevTex

Scientific paper

10.1103/PhysRevC.63.025205

We study low-energy virtual Compton scattering off the proton within the framework of a nonrelativistic constituent quark model. The Compton tensor is divided into two separately gauge-invariant contributions. The first consists of the groundstate propagation in the direct and crossed channels together with an appropriately chosen term to satisfy gauge invariance. The residual part contains the relevant structure information characterized by the so-called generalized polarizabilities. We discuss two different schemes to obtain the generalized polarizabilities from the residual term. Explicit predictions for the generalized polarizabilities are presented for the Isgur-Karl model. Our results are compared with previous predictions in that model as well as other approaches.

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