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Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 11: Poster Session: Electromagnetic and Hadronic Probes

HK 11.6: Poster

Tuesday, March 9, 2004, 13:30–15:30, Foyer

Photoproduction of η-mesons from the proton. — •Alexander Sibirtsev1, Siegfried Krewald1, and Charlotte Elster21IKP-TH, FZJ, Juelich. — 2Ohio University

The presently available data for the reaction γ p→ηp are analyzed in terms of a model in which the dominant production mechanism is the exchange of the vector mesons, ω and ρ. To describe the data at photon energies close to the production threshold we introduce a resonance contribution due to the well established S11(1535) resonance. Finally we study the contributions due to nucleon exchange to the η photoproduction and find, that those contributions can be seen at large angles in the differential cross section.

The preliminary data from CLAS Collaboration at Jefferson Lab are in good agreement with our predictions. Further progress in understanding the η photoproduction is expected from future studies by CB-TAPS at ELSA and polarization measurements at JLab.

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