Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 14: Hadronenstruktur und -spektroskopie

HK 14.8: Vortrag

Montag, 4. März 2013, 18:45–19:00, WIL-C307

Polarization Observables T and F in Single π⁰-Photoproduction off Quasi-Free Protons and Neutrons — •Thomas Strub — Departement of Physics, University of Basel, CH-4056 Basel, Switzerland

The study of the nucleons’ excitation spectrum produced by meson photoproduction is indispensable in order to test QCD in the non-pertubative regime where effective quark models and lattice QCD become essential. The decomposition of overlapping resonances can only be done knowing their J^P configuration which is linked to the polarization observables through partial wave analysis. Furthermore, to understand the isospin decomposition of excited states it is necessary to measure on both the proton and the neutron.

Single π⁰-photoproduction off a transversally polarized D-Butanol target has been measured with high statistics using circularly polarized bremsstrahlung photons produced by the MAMI-C electron microtron with incident energies up to 1.5 GeV. The nearly 4π acceptance of the combined Crystal Ball/TAPS setup of the A2 collaboration is used to extract the double polarization observable F and the target asymmetry T for the polarized, quasi-free proton and neutron over a wide invariant mass and theta range. Preliminary results for the polarization observables will be presented.