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arxiv: 1010.0714 · v1 · pith:A6V3EMBKnew · submitted 2010-10-04 · ⚛️ nucl-th

Pion photoproduction in a dynamical coupled-channel model

classification ⚛️ nucl-th
keywords pi-ngammamodelphotoproductionpioncenter-of-masschannelscoupled-channel
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Pion photoproduction reactions are investigated in a dynamical coupled-channel approach based on the Juelich pi-N model, which presently includes the hadronic pi-N and eta-N stable channels as well as the pi-Delta, sigma-N and rho-N effective channels. This model has been quite successful in the description of pi-N to pi-N scattering for center-of-mass energies up to 1.9 GeV. The full pion photoproduction amplitude is constructed to satisfy the generalized Ward-Takahashi identity and hence, it is fully gauge invariant. The calculated differential cross sections and photon spin asymmetries up to 1.65 GeV center-of-mass energy for the reactions gamma p to pi+ n, gamma p to pi0 p and gamma n to pi- p are in good agreement with the experimental data.

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