Generalized polarizabilities of the proton in a constituent quark model revisited

Abstract

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.

38 pages, 7 figures, Latex, using RevTex

References in corpus (4)

• The first determination of Generalized Polarizabilities of the proton by a Virtual Compton Scattering experiment
• Generalized Polarizabilities of the Nucleon in Chiral Effective Theories
• Deuteron Compton scattering below pion photoproduction threshold
• Elastic Compton scattering from the deuteron and nucleon polarizabilities

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