Analysis of recent eta photoproduction data

Details Analysis of recent eta photoproduction data Analysis of recent eta photoproduction data

2010-07-19

arxiv.org/abs/1007.3140v2

Eur.Phys.J.A46:359-371,2010

Physics

Nuclear Physics

Nuclear Theory

13 pages, 13 figures; small modifications in the text, some figures are improved, accepted for publication by Eur. Phys. J. A

Scientific paper

10.1140/epja/i2010-11049-2

Recent data on eta-meson photoproduction off a proton target in the energy range 2 < sqrt{s} < 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 gamma p -> eta p at higher energies. We find that all recent experimental results on differential cross sections for eta-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 indications in the data for a possible excitation of baryon resonances with masses around 2.1 and 2.4 GeV.

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