Extraction of electromagnetic properties of the {Delta}(1232) excitation from pion photoproduction
- Institut fuer Theoretische Physik, Universitaet Hannover, D-30167 Hannover (Germany)
- Institut fuer Kernphysik, Johannes Gutenberg-Universitaet, D-55099 Mainz (Germany)
Several methods for the treatment of pion photoproduction in the region of the {Delta}(1232) resonance are discussed, in particular the effective Lagrangian approach and the speed plot analysis are compared to a dynamical treatment. As a main topic, we discuss the extraction of the genuine resonance parts of the magnetic dipole and electric quadrupole multipoles of the electromagnetic excitation of the resonance. To this end, we try to relate the various values for the ratio R{sub EM} of the E2 to M1 multipole excitation strengths for the {Delta}(1232) resonance as extracted by the different methods to corresponding ratios of a dynamical model. Moreover, it is confirmed that all methods for extracting resonance properties suffer from an unitary ambiguity which is due to some phenomenological contributions entering the models. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 566008
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 1 Vol. 57; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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