Analyzing $\eta'$ Photoproduction Data on the Proton at Energies of   1.5--2.3 GeV
  A combined analysis of the existing data on the reactions $\gamma p \to p \eta^\prime $ and $pp \to pp\eta^\prime $, based on a relativistic meson exchange model of hadronic interactions, is presented. 
K. Nakayama and H. Haberzettl