Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 69: Hadron Structure and Spectroscopy I

HK 69.8: Talk

Thursday, March 19, 2009, 18:45–19:00, H-ZO 20

Linearly Polarized Photons at ELSA* — •Holger Eberhardt — Physikalisches Institut der Universität Bonn

To investigate the nucleon resonance regime in meson photoproduction, double polarization experiments are currently performed at the electron accelerator ELSA in Bonn. The experiments make use of a polarized target and circularly or linearly polarized photon beams. Linearly polarized photons are produced by coherent bremsstrahlung from an accurately aligned diamond crystal. The orientation of the crystal with respect to the electron beam is measured using the Stonehenge-Technique. Both, the energy of maximum polarization and the plane of polarization, can be deliberately chosen for the experiment. The linearly polarized beam provides the basis for the measurement of azimuthal beam asymmetries, such as Σ (unpolarized target) and G (polarized target). These observables are extracted in various single and multiple meson photoproduction channels.

*supported by the DFG (SFB/TR-16)