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Differential cross section measurement of eta photoproduction on the proton from threshold to 1100 MeV

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arxiv hep-ex/0011098 v2 pith:2AMYAXEZ submitted 2000-11-30 hep-ex

GRAAL collaboration: F. Renard , M. Anghinolfi , O. Bartalini , V. Bellini , J.-P. Bocquet , M. Capogni , M. Castoldi , P. Corvisiero
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A. D'Angelo J.-P. Didelez R. Di Salvo C. Gaulard G. Gervino F. Ghio B. Girolami M. Guidal E. Hourany V. Kouznetsov R. Kunne A. Lapik P. Levi Sandri A. Lleres D. Moricciani V. Nedorezov L. Nicoletti D. Rebreyend N. Rudnev M. Sanzone C. Schaerf M.-L. Sperduto M.-C. Sutera M. Taiuti A. Turinge Q. Zhao A. Zucchiatti
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keywords crossdatadifferentialextractionmeasuredphotonphotoproductionsection
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The differential cross section for the reaction p(gamma, eta p) has been measured from threshold to 1100 MeV photon laboratory energy. For the first time, the region of the S11(1535) resonance is fully covered in a photoproduction experiment and allows a precise extraction of its parameters at the photon point. Above 1000 MeV, S-wave dominance vanishes while a P-wave contribution is observed whose nature will have to be clarified. These high precision data together with the already measured beam asymmetry data will provide stringent constraints on the extraction of new couplings of baryon resonances to the eta meson.

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