Eur. Phys. J. A (2010) 46: 359-371
https://doi.org/10.1140/epja/i2010-11049-2

Regular Article - Theoretical Physics

Analysis of recent photoproduction data

¹ Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics, Universität Bonn, D-53115, Bonn, Germany
² Excited Baryon Analysis Center (EBAC), Thomas Jefferson National Accelerator Facility, 23606, Newport News, VA, USA
³ Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425, Jülich, Germany
⁴ Institute of High Energy Physics and Center for Theoretical Studies, Chinese Academy of Sciences, 100049, Beijing, China
⁵ Institute for Advanced Simulation, Forschungszentrum Jülich, D-52425, Jülich, Germany

^* e-mail: j.haidenbauer@fz-juelich.de

Received: 19 July 2010
Accepted: 28 September 2010
Published online: 24 October 2010

Abstract

Recent data on -meson photoproduction off a proton target in the energy range 2 3 GeV are analyzed with regard to their overall consistency. Results from the ELSA and CLAS measurements are compared with predictions of a Regge model whose reaction amplitude was fixed via a global fit to pre-2000 measurements of differential cross sections and polarization observables for p p at higher energies. We find that all recent experimental results on differential cross sections for -meson photoproduction are in good agreement with each other, except for the CLAS data from 2009. However, the latter can be made consistent with the other data at the expense of introducing an energy-dependent renormalization factor. We point out that there are indications in the data for a possible excitation of baryon resonances with masses around 2.1 and 2.4GeV.