Recent progress in pion photo- and electroproduction analysis
Nuclear Theory
2007-05-23 v1
Abstract
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.
Cite
@article{arxiv.nucl-th/0111062,
title = {Recent progress in pion photo- and electroproduction analysis},
author = {L. Tiator and D. Drechsel and S. Kamalov and S. N. Yang},
journal= {arXiv preprint arXiv:nucl-th/0111062},
year = {2007}
}
Comments
8 pages Latex, Proceedings of MENU2001