Abstract
One-loop corrections to photoproduction near threshold have been investigated by using the approximation that all relevant transition amplitudes are calculated from the tree diagrams of effective Lagrangians. With the parameters constrained by the data of and reactions, it is found that the one-loop effects due to the intermediate and states can significantly change the differential cross sections and spin observables. The results from this exploratory investigation suggest strongly that the coupled-channel effects should be taken into account in extracting reliable resonance parameters from the data of vector meson photoproduction in the resonance region.
- Received 15 April 2002
DOI:https://doi.org/10.1103/PhysRevC.66.045201
©2002 American Physical Society