Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2004-07-21
Phys.Rev.C70:032201,2004
Physics
Nuclear Physics
Nuclear Theory
9 pages, 5 figures, several small corrections, to be published in Phys. Rev. C
Scientific paper
10.1103/PhysRevC.70.032201
We obtain the electromagnetic form factors of the $\gamma N\Delta$ transition by analyzing recent pion-electroproduction data using a fully relativistic dynamical model. Special care is taken to satisfy Ward-Takahashi identities for the Born term in the presence of form factors thereby allowing the use of realistic electromagnetic form factors of the nucleon and pion. We parametrize the $Q^2$ dependence of the {\it bare} $\gamma N \Delta$ form factors by a three-parameter form which is consistent with the asymptotic behavior inferred from QCD. The parameters of the bare $\gamma N \Delta$ form factors are the only free parameters of the model and are fitted to the differential cross-section and multipole-analysis data up to $Q^2=4$ (GeV/c)$^2$ in the $\Delta(1232)$-resonance region. This analysis emphasizes the significance of the pion-cloud effects in the extraction of the resonance parameters.
Caia George L.
Pascalutsa Vladimir
Tjon John A.
Wright Louis E.
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