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HK: Fachverband Physik der Hadronen und Kerne
HK 47: Hadron Structure and Spectroscopy VI
HK 47.3: Vortrag
Mittwoch, 13. März 2024, 16:30–16:45, HBR 62: EG 19
Determination of the polarization observables Σ, Ic and Is in the reaction γ p → pπ0η — •Georg Urff for the CBELSA/TAPS collaboration — Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Nussallee 14-16, 53115 Bonn
The excited states of the nucleon appear as broad and overlapping structures in the experimental data. The challenge of extracting information from the data is tackled by partial wave analyses (PWA) used to disentangle the contributing resonances and aiming to find unambiguous solutions. Whether unambiguous solutions can be found strongly depends on additional constraints provided by polarization observables. In addition, to gain a complete picture of baryon resonances and their properties, multi-meson decays are of large interest, particularly at higher energies.
The CBELSA/TAPS experiment provides an energy tagged linearly or circularly polarized photon beam impinging on a longitudinally or transversally polarized target, allowing for the determination of single and double polarization observables. The Crystal Barrel calorimeter combined with the MiniTAPS calorimeter in forward direction provide a nearly 4π angular coverage. Due to their high photon detection efficiency and good energy resolution the experiment is ideally suited to find states with neutral mesons decaying into photons.
This presentation covers results for polarisation observables Σ, Ic and Is in the pπ0η final state obtained with a linearly polarized photon beam at coherent edge positions of 1750 MeV and 1850 MeV with an unpolarized target.