Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1853608 | Physics Letters B | 2008 | 5 Pages |
Abstract
We investigate the importance of crossing symmetry in effective field models and the effects of phenomenological nucleon resonance widths on the paradigmatic case of pion photoproduction. We use reaction models containing four star resonances up to 1.8 GeV (Î(1232), N(1440), N(1520), N(1535), Î(1620), N(1650), Î(1700), and N(1720)) with different prescriptions for crossed terms and widths, to fit the latest world database on pion photoproduction. We compare Ï2 results from selected multipoles and fits. The Ï2 is highly dependent on the fulfillment of crossing symmetry and the inclusion of u channels.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
C. Fernández-RamÃrez, E. Moya de Guerra, J.M. UdÃas,