Recent progress in pion photo- and electroproduction analysis

Details Recent progress in pion photo- and electroproduction analysis Recent progress in pion photo- and electroproduction analysis

2001-11-22

arxiv.org/abs/nucl-th/0111062v1

PiN Newslett. 16 (2002) 41-48

Physics

Nuclear Physics

Nuclear Theory

8 pages Latex, Proceedings of MENU2001

Scientific paper

Pion photo- and electroproduction has been studied at threshold and in the resonance region below W=2GeV. At threshold pi^0 production can be very well explained within a dynamical model derived from an effective chiral Lagrangian. The final state interaction is nearly saturated by single charge exchange rescattering. In the resonance region new electroproduction data at Q^2=1GeV^2 has been analyzed with MAID and longitudinal and transverse photon helicity amplitudes have been determined for different resonances. A detailed study of the E/M and S/M ratios of the N->Delta transition shows a zero crossing of REM near Q^2=4GeV^2, whereas the RSM becomes increasingly negative at large Q^2.

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