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

doi:10.1140/epja/i2014-14101-3

EPJ

Photocouplings at the pole from pion photoproduction

D. Rönchen¹^*, M. Döring²^,3, F. Huang⁴^,5, H. Haberzettl³, J. Haidenbauer¹^,6, C. Hanhart¹^,6, S. Krewald¹^,6, U. -G. Meißner¹^,2^,6 and K. Nakayama¹^,5

¹ Institut für Kernphysik and Jülich Center for Hadron Physics, 52425, Jülich, Germany
² Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics, Universität Bonn, Nußallee 14-16, 53115, Bonn, Germany
³ Institute for Nuclear Studies and Department of Physics, The George Washington University, 20052, Washington, DC, USA
⁴ School of Physics, University of Chinese Academy of Sciences, 101408, Beijing, China
⁵ Department of Physics and Astronomy, University of Georgia, 30602, Athens, Georgia, USA
⁶ Institute for Advanced Simulation, 52425, Jülich, Germany

Received: 29 January 2014
Revised: 9 May 2014
Accepted: 14 May 2014
Published online: 24 June 2014

Abstract

The reactions $\gamma p\rightarrow\pi^{0}p$ and $\gamma p\rightarrow\pi^{+}n$ are analyzed in a semi-phenomenological approach up to $E\sim 2.3$ 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 $\pi$ N scattering and the world data base of the reactions $\pi N\rightarrow\eta N$ , 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.

15th European Conference on Atoms Molecules and Photons (ECAMP)
June 30 to July 4, 2025
Innsbruck, Austria

EPJ

Photocouplings at the pole from pion photoproduction

Conference announcements