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HK: Fachverband Hadronen und Kerne

HK 24: Hadron Structure and Spectroscopy I

HK 24.5: Talk

Tuesday, March 17, 2009, 15:30–15:45, H-ZO 20

Photoproduction of η-mesons off the deuteron — •Dominik Werthmüller — Department of Physics, University of Basel

Photoproduction of η-mesons off a liquid deuterium target has been measured using bremsstrahlung photons produced by MAMI-C with incident energies up to 1.5 GeV. The η-meson was detected through its neutral decays into 2γ and 3π⁰→ 6γ, respectively, in a combined setup of the Crystal Ball calorimeter and a TAPS forward wall which results in an almost 4π acceptance. Previous experiments performed by the CBELSA/TAPS and the GRAAL collaborations studying η-photoproduction on the deuteron revealed a bump-like structure of still unknown nature in the quasi-free neutron excitation function around E_γ = 1 GeV that is not found for the proton. The present experiment aimed at a significant improvement of the statistical quality of the data, in particular for η-mesons at backward angles. Preliminary results for the inclusive γ (d, η)X, the semi-exclusive γ(d, η)NN, and the fully exclusive reactions measured in coincidence with the recoil nucleons will be presented.

Supported by Schweizerischer Nationalfond, DFG, and EU/FP6.