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HK: Fachverband Physik der Hadronen und Kerne

HK 11: Elektromagnetische und Hadronische Sonden

HK 11.7: Talk

Tuesday, March 13, 2007, 15:45–16:00, A

Eta photoproduction on the neutron in the resonance region — •Vitaly Shklyar, Horst Lenske, and Ulrich Mosel — Institut für Theoretische Physik, Universität Giessen, Germany

The eta-production on the neutron in the nucleon resonance energy region is studied within the unitary coupled-channel effective Lagrangian approach of the Giessen Model. A recently observed second peak in the total cross section of eta-neutron photoproduction at 1.67 GeV has obtained much attention and was interpreted as evidence for a new nucleon resonance. We find that this structure can be explained in terms of a superposition of the known S11(1650) and P11(1710) resonances. We also have calculated spin observables. We predict that the photon beam asymmetry is positive and has a maximum at forward angles.

Work supported by FZ Juelich.