Köln 2004 – wissenschaftliches Programm
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PV: Plenarvorträge
PV XI
PV XI: Plenarvortrag
Dienstag, 9. März 2004, 12:00–12:30, P
VCS at JLab and MAMI — •Luc Van Hoorebeke for the VCS collaboration at MAMI and the Jefferson Lab Hall A/VCS collaboration — Department of Subatomic and Radiation Physics, UGent, Proeftuinstraat 86, 9000 Gent, Belgium
Virtual Compton Scattering (VCS) off the proton refers to the reaction γ*+p→γ+p′. At low c.m. energies this reaction allows to measure (combinations of) the 6 Generalized Polarizabilities (GPs) of the proton. These new observables are an extension of the electromagnetic polarizabilities α and β obtained from Real Compton Scattering. They are related to the ease with which the nucleon adapts its internal structure to an external quasi-static electromagnetic field.
At MAMI and JLab the first dedicated VCS experiments have been performed to obtain information on the GPs at different values of Q2. The γ*+p→γ+p′ reaction is accessible through photon electro-production, whereby the scattered electron and recoil proton are detected in high resolution magnetic spectrometers and photon production events are identified by missing mass reconstruction. Results from these experiments will be presented, as well as future prospects.