6533b7d3fe1ef96bd12602ac
RESEARCH PRODUCT
Generalized polarizabilities and electroexcitation of the nucleon
S.s. KamalovDieter DrechselLothar TiatorB. PasquiniGastão Kreinsubject
PhysicsNuclear and High Energy PhysicsChiral perturbation theoryNuclear TheoryProtonNuclear TheoryFOS: Physical sciencesVirtual particleNuclear Theory (nucl-th)Nuclear physicsPionPolarizabilityNuclear ExperimentNucleonExcitationSpin-½description
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1999-07-14 | Nuclear Physics A |