Pion photoproduction resonance couplings in the second resonance region

Abstract

Resonance couplings for the resonant states ${\mathit{P}}_{33}$(1232), ${\mathit{P}}_{11}$(1440), ${\mathit{D}}_{13}$(1520), and ${\mathit{S}}_{11}$(1535) are extracted from a recent multipole analysis of pion photoproduction data. We calculate photoproduction residues at the resonance pole in the complex plane for these amplitudes, in addition to the resonance widths at the on-shell resonance energies.