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HK: Fachverband Physik der Hadronen und Kerne

HK 6: Hadronenstruktur und -spektroskopie

HK 6.3: Vortrag

Montag, 4. März 2013, 11:45–12:00, HSZ-304

Narrow Structure in η-Photoproducion off ²H and ³He — •Lilian Witthauer and Dominik Werthmüller — Department of Physics, University of Basel, Switzerland

Large efforts have been made in the last years to investigate the complicated excitation spectrum of the nucleons. Especially η-Photoproduction has been studied by many collaborations. Experiments at CBELSA/TAPS and GRAAL revealed a bump-like structure in the quasi-free η-Photoproduction on the neutron, which is not seen on the proton (I. Jaeglé et al., PRL 100 (2008), V.Kuznetsov et al., PLB 647 (2007)).

To examine this structure high statistics experiments using the A2 detector setup with the Crystal Ball calorimeter and the TAPS detector at the electron acceleration facility MAMI have been carried out. To exclude any possibility that the structure could arise from nuclear effects, η-photoproduction in coincidence with recoil nucleons has been measured on two different targets, namely ²H and ³He.

This talk gives an overview over the final results on quasi-free inclusive and exclusive η-Photoproduction off quasi-free protons and neutrons.

Supported by Swiss National Fund and DFG.