Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2003-10-14
Eur.Phys.J. A19 (2004) 55-60
Physics
Nuclear Physics
Nuclear Theory
6 pages Latex including 5 figures, Invited talk at ICTP 4th International Conference on Perspectives in Hadronic Physics, Trie
Scientific paper
The unitary isobar model MAID has been extended and used for a partial wave analysis of pion photo- and electroproduction in the resonance region W < 2 GeV. Older data from the world data base and more recent experimental results from Mainz, Bates, Bonn and JLab for Q^2 up to 4.0 (GeV/c)^2 have been analyzed and the Q^2 dependence of the helicity amplitudes have been extracted for a series of four star resonances. We compare single-Q^2 analyses with a superglobal fit in a new parametrization of Maid2003 together with predictions of the hypercentral constituent quark model. As a result we find that the helicity amplitudes and transition form factors of constituent quark models should be compared with the analysis of bare resonances, where the pion cloud contributions have been subtracted.
Drechsel Dieter
Giannini M. M.
Kamalov Sabit S.
Santopinto Elena
Tiator Lothar
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