Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 33: Hadron Structure and Spectroscopy VI

HK 33.3: Vortrag

Mittwoch, 16. März 2016, 15:00–15:15, S1/01 A5

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

In contrast to the atomic spectrum with its sharp and well defined excitation levels, the nucleon excitation spectrum is dominated by broad, overlapping resonances. Partial wave analyses are needed to extract the contributing resonances from the experimental data. In order to find an unambiguous solution, the measurement of polarization observables is indispensable.

The Crystal Barrel/TAPS experiment at the electron accelerator ELSA is, due to its high photon detection efficiency and its almost complete solid angle coverage, ideally suited to measure neutral mesons decaying into photons. The measurement with double polarization, i.e. a circularly polarized photon beam and a longitudinally polarized target provides access to single and double polarization observables. At higher energies, the cross sections show that multi-meson decay channels gain in importance compared e.g. to single pseudoscalar meson photoproduction.

In this talk, preliminary results for the helicity asymmetry E in 2π⁰-photoproduction measured with the CBELSA/TAPS experiment will be presented.

Supported by the Deutsche Forschungsgemeinschaft (SFB/TR16).