Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 4: Hadron Structure and Spectroscopy I

HK 4.2: Eingeladener Gruppenbericht

Montag, 16. März 2009, 14:30–15:00, H-ZO 20

Baryon Structure and Spectroscopy at ELSA — •Reinhard Beck — Helmholtz-Institut für Strahlen- und Kernphysik, Nußallee 14-16, D-53115 Bonn

Photoproduction of single and multi-meson final states have been investigated at the electron stretcher ring ELSA to study the spectrum and the properties of excited baryons. Especially, the measurements of double polarization observables is of crucial importance to increase the sensitivity for small resonance contributions and to reduce the ambiguties in the existing solutions for the excitation spectrum.

With the Crystal Barrel/TAPS experiment at ELSA, new precise data with linearly and circularly polarized photons on a longitudinally polarized target have been taken. The first results for the double polarization observables E and G in single and multi-meson photoproduction will be presented and compared to quark model predictions and existing partial wave solutions.

Supported by the DFG (SFB/TR16)