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Article overview
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Recent progress in pion photo- and electroproduction analysis | | L. Tiator
; D. Drechsel
; S. Kamalov
; S.N. Yang
; | | Date: |
22 Nov 2001 | | Journal: | PiN Newslett. 16 (2002) 41-48 | | Subject: | nucl-th | | 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. | | Source: | arXiv, nucl-th/0111062 | | Services: | Forum | Review | PDF | Favorites | |
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