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Measurement of eta photoproduction on the proton from threshold to 1500 MeV

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arxiv 0707.1385 v1 pith:ADMGN53Z submitted 2007-07-10 nucl-ex

O. Bartalini , V. Bellini , J.P. Bocquet , P. calvat , M. Capogni , L. Casano , M. Castoldi , A. D'Angelo
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J.P. Didelez R. Di Salvo A. Fantini D. Franco C. Gaulard G. Gervino F. Ghio G. Giardina B. Girolami A. Giusa M. Guidal E. Hourany R. Kunne A. Lapik P. Levi Sandri A. Lleres F. Mammoliti G. Mandaglio D. Moricciani A.N. Mushkarenkov V. Nedorezov L. Nicoletti C. Perrin C. Randieri D. Rebreyend F. Renard N. Rudnev T. Russew G. Russo C. Schaerf M.L. Sperduto M.C. Sutera A. Turinge V. Vegna (The GRAAL collaboration)
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keywords wereeta-resultsthresholdagreementanalyzedasymmetrybeam
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Beam asymmetry and differential cross section for the reaction gamma+p->eta+p were measured from production threshold to 1500 MeV photon laboratory energy. The two dominant neutral decay modes of the eta meson, eta->2g and eta->3pi0, were analyzed. The full set of measurements is in good agreement with previously published results. Our data were compared with three models. They all fit satisfactorily the results but their respective resonance contributions are quite different. The possible photoexcitation of a narrow state N(1670) was investigated and no evidence was found.

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