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HK: Fachverband Physik der Hadronen und Kerne
HK 24: Elektromagnetische und Hadronische Sonden
HK 24.2: Talk
Wednesday, March 14, 2007, 11:30–11:45, A
The reaction γ p→π∘γ′ p measured with circularly polarised photons and the Magnetic Dipole *Moment of the Δ+(1232) — •Benedicte Boillat for the A2 collaboration — Institut fuer Physik, Klingelbergstrasse 82, 4056 Basel, Switzerland
The magnetic dipole moment of the Δ+(1232) resonance is a fundamental observable
and provides a stringent test of baryons structure calculations. A pioneering measurement
was performed in year 2002 and delivered a result of (2.7 ± 2.2 (exp))µN.
However, a higher precision is needed to allow a clear selection between different structure
models.
A new dedicated experiment using the Crystal Ball and TAPS detectors has been performed 2004/2005
at MAMI, offering a superior 4π-acceptance and particle identification.
In parallel progress has also be made by theory groups in the development of model calculations which
are needed to extract the dipole magnetic moment for this reaction.
The reaction was experimentally studied with circularly polarised photons so that in addition to the largely improved
statistical quality of the angular distributions also a first attempt to extract the polarisation observable
Σcirc can be made. Preliminary results will be presented.
This work is supported by the Swiss National Fund and the DFG (SFB443).