Baryon Spectroscopy - Recent results from the Crystal Barrel Experiment at ELSA -^*

Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, 53115 Bonn, Germany

^a e-mail: schmidt@hiskp.uni-bonn.de

Abstract

To understand the spectrum and the properties of baryon resonances, the CBELSA/TAPS experiment investigates the photoproduction off the nucleon using linearly, circularly polarized or unpolarized photons impinging on a polarized or unpolarized target. Preliminary results on first double polarization observables have been obtained for the reactions → pπ⁰ and → pη using both circular and linear polarized photons on a longitudinally polarized target. This data will finally provide important information for the partial wave analyzes used to extract the resonances from the data.