Generalized polarizabilities and electroexcitation of the nucleon

Details Generalized polarizabilities and electroexcitation of the nucleon Generalized polarizabilities and electroexcitation of the nucleon

1999-07-14

arxiv.org/abs/nucl-th/9907056v1

Nucl.Phys. A660 (1999) 57-68

Physics

Nuclear Physics

Nuclear Theory

21 pages, latex, 14 figures

Scientific paper

10.1016/S0375-9474(99)00359-0

Generalized nucleon polarizabilities for virtual photons can be defined in terms of electroproduction cross sections as function of the 4-momentum transfer $Q^2$. In particular, the sum of the generalized electric and magnetic polarizabilities $\Sigma=\alpha+\beta$ and the spin polarizability $\gamma$ can be expressed by virtual photon absorption cross sections integrated over the excitation energy. These quantities have been calculated within the framework of the recently developed unitary isobar model for pion photo- and electroproduction on the proton, which describes the available experimental data up to an excitation energy of about 1 GeV. Our results have been compared to the predictions of chiral perturbation theory.

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