Pion Photoproduction,NNScattering, and Photoproduction Sum Rules
- 25 November 1968
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 175 (5), 2014-2024
- https://doi.org/10.1103/physrev.175.2014
Abstract
The differential cross sections for pion photoproduction have been examined along with those for and scattering. It is found that an pion parity-doublet fit is consistent with both sets of data if a full dynamical zero in the vertex function is hypothesized. If a square-root-type dynamical zero is postulated, some problems with consistency between fits arise. In the former case, the zero is at Ge. In both fits the , , and trajectories are introduced. The possibility of an parity-doublet-type conspiracy for the trajectory has also been investigated qualitatively. This assignment is suggested by a -trajectory photoproduction finite-energy sum rule and by consistency requirements between phenomenological fits and the Bietti-Roy-Chu pion-photoproduction sum rule which predicts Ge. Additional experimental tests for an trajectory are proposed.
Keywords
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