Photocouplings at the Pole from Pion Photoproduction
  The reactions $\gamma p\to\pi^0 p$ and $\gamma p\to\pi^+ n$ are analyzed in a semi-phenomenological approach up to $E\sim2.3$ GeV. Fits to differential cross section and single and double polarization observables are performed. A good overall reproduction of the available photoproduction data is achieved. The J\"ulich2012 dynamical coupled-channel model -which describes elastic $\pi N$ scattering and the world data base of the reactions $\pi N\to\eta N$, $K\Lambda$, and $K\Sigma$ at the same time - is employed as the hadronic interaction in the final state. The framework guarantees analyticity and, thus, allows for a reliable extraction of resonance parameters in terms of poles and residues. In particular, the photocouplings at the pole can be extracted and are presented. 
D. R\"onchen, M. D\"oring, F. Huang, H. Haberzettl, J. Haidenbauer, C.   Hanhart, S. Krewald, U.-G. Mei{\ss}ner, K. Nakayama
nucl-th hep-ph nucl-ex