In photoproduction experiments, a large number of final states yielding various resonance contributions are accessible. To extract resonance parameters via partial-wave analysis not only the measurement of differential cross-sections is necessary, but also the determination of polarization observables. At the electron accelerator ELSA (Bonn) the coherent bremsstrahlung method was used to generate a linearly polarized photon beam. Using the CBELSA/TAPS detector setup, the beam asymmetry Σ in the reaction γp → pπ0η was determined as a function of various masses and angles for photon energies between 970MeV and 1650MeV.
13.60.-r Photon and charged-lepton interactions with hadrons 13.60.Le Meson production 13.88.+e Polarization in interactions and scattering