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arXiv · 1401.0634

Photocouplings at the Pole from Pion Photoproduction

D. Rönchen·M. Döring·F. Huang·H. Haberzettl·J. Haidenbauer·C. Hanhart·S. Krewald·U. -G. Meißner·K. Nakayama
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Abstract

The reactions $γp\toπ^0 p$ and $γp\toπ^+ n$ 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 Jülich2012 dynamical coupled-channel model -which describes elastic $πN$ scattering and the world data base of the reactions $πN\toηN$, $KΛ$, and $KΣ$ 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.

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D. Rönchen, M. Döring, F. Huang, H. Haberzettl, J. Haidenbauer, C. Hanhart, S. Krewald, U. -G. Meißner, K. Nakayama. 2015-04-07. Photocouplings at the Pole from Pion Photoproduction. https://doi.org/10.1140/epja%2Fi2014-14101-3

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