Heidelberg 2015 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 48: Poster

HK 48.2: Poster

Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer

Measurement of polarization observables in 2π⁰-photoproduction off the proton with the CBELSA/TAPS-experiment — Philipp Mahlberg and •Tobias Seifen for the CBELSA/TAPS collaboration — Helmholtz-Institut für Strahlen- und Kernphysik, Nussallee 14-16, 53115 Bonn

One important step in understanding the baryon spectrum is a precise knowledge of the excited states and their decays. In order to extract the contributing resonances from experimental data a partial wave analysis needs to be performed. To resolve ambiguities, the measurement of polarization observables is indispensable. In the regime of high mass baryon resonances multi-meson final states are of particular importance. Here sequential decays of resonances are observed.

The Crystal Barrel/TAPS experiment is ideally suited to measure the photoproduction of neutral mesons decaying into photons due to its good energy resolution, high detection efficiency for photons, and the nearly complete solid angle coverage. In combination with a longitudinally or transversely polarized target and an energy tagged, linearly or circularly polarized photon beam the experiment allows the measurement of a large set of polarization observables.

Preliminary results on the reaction γ^→p^→→ pπ⁰π⁰ obtained with a transversely as well as with a longitudinally polarized target will be presented.

Supported by the Deutsche Forschungsgemeinschaft (SFB/TR16).