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

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