SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 57: Hadron Structure and Spectroscopy VI
HK 57.1: Gruppenbericht
Donnerstag, 23. März 2023, 14:00–14:30, SCH/A316
Multi-meson photoproduction off the proton - recent results from the CBELSA/TAPS experiment — •Philipp Mahlberg for the CBELSA/TAPS collaboration — Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Deutschland
The nucleon excitation spectrum is dominated by mostly broad resonances, so partial wave analyses (PWA) are needed to extract the overlapping resonances from the experimental data. In order to find an unambiguous solution, the measurement of polarization observables is indispensable.
Meson photoproduction experiments have provided an extensive database which in turn let different partial wave analyses converge to similar results. The findings fit surprisingly well in an ordering scheme imposed by a non-relativistic quark model. Within the higher mass regime, the PWA solutions are less constrained and not all model-predicted states have been confirmed by experiments. Here, multi-meson decay channels gain importance and sequential decay chains can be studied.
The Crystal Barrel/TAPS experiment is, due to its good energy resolution, high photon detection efficiency and its almost complete solid angle coverage, ideally suited to measure such multi-meson final states in which neutral mesons decay into photons.
For the pπ0π0 and pπ0η final states, recent results – obtained with a linearly polarized photon beam at different coherent edge positions (up to 1850 MeV), impinging on an either transversely polarized or unpolarized target – will be presented.