Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 61: Hadronenstruktur und -spektroskopie

HK 61.7: Vortrag

Donnerstag, 7. März 2013, 15:45–16:00, HSZ-105

Beam asymmetry Σ in π⁰ photoproduction off protons bound in carbon nuclei — •Inke Jürgensen — HISKP University of Bonn

In order to study the dynamics of the inner components of the nucleon, its excitation spectrum is investigated through meson-photoproduction. Due to the strong overlap of the nucleon’s excited states, it is insufficient to determine the cross section only. To identify all resonance contributions unambiguously, single and double polarization observables have to be measured. At the Crystal Barrel experiment at ELSA in Bonn, this is achieved utilizing linearly or circularly polarized photons and longitudinally or transversely polarized nucleons. Polarized protons are realized in a butanol target, which consists of hydrogen, oxygen and carbon. A pure carbon target was used to perform a background measurement. The results for the beam asymmetry Σ in π⁰ photoproduction, obtained with a carbon target and a linearly polarized photon beam, will be presented. Furthermore, the influence of carbon background on the measured polarization observables will be discussed. Supported by the Deutsche Forschungsgemeinschaft (SFB/TR 16)