Speaker
Description
Baryon spectroscopy aims to determine the full spectrum of baryon resonances and to understand their properties. At the CBELSA/TAPS experiment in Bonn, measurements are carried out using a polarized photon beam and various targets, including a deuterated butanol target with polarizable neutrons. By polarizing the photon beam and/or the target material, asymmetries can be measured, which allow for the extraction of corresponding polarization observables. Polarization observables are sensitive to interference terms between different resonant and non-resonant amplitudes, and can be employed to extract broad and overlapping resonances precisely. Resonances may couple more strongly to neutrons than to protons. Therefore, photoproduction experiments off the neutron are essential for a better understanding of the nucleon excitation spectrum. However, in comparison to the data taken off the proton, the extend of data taken off the neutron is lacking both in coverage of investigated final states and sample size. For the present work, measurements were conducted with a linearly polarized photon beam and a transversely polarized deuterized butanol target. Final states with two mesons have been investigated, which allow for the investigation of sequential decays via intermediate resonances, offering insight into a sector not accessible by single meson production. Within $N \pi^0 \eta$ photoproduction, the intermediate $\Delta \eta$ state provides an isospin filter for $\Delta^\star$ resonances. In this contribution, preliminary results for polarization observables in the reaction $\gamma N \rightarrow N \pi^0 \eta$ as well as important aspects of the analysis procedure will be presented.
Supported by the DFG (Project-Nr.: 505387544).