Pion charge radius and the pion form factor
- 1 February 1977
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 15 (3), 696-703
- https://doi.org/10.1103/physrevd.15.696
Abstract
The pion charge-form-factor data for positive and negative values of , the -wave phase-shift data, and the pion charge-radius data are analyzed using form factors previously developed by us and other authors. The peaked behavior near threshold for the -wave phase shift suggested by Levin and Okubo is found not to be necessary for large charge-radius values, but larger slopes () at threshold do seem to be the important factor. We conclude that a more precise measurement of the pion charge radius is necessary to separate the different theoretical models. We also find that the form-factor data near (timelike) are sufficiently imprecise that nothing definitive can be said about the existence of the resonance. if such a resonance exists and if the pion has no hard core, the data are either consistent with a resonance of width MeV or consistent with a resonance of large width if at least one additional resonance, , exists.
Keywords
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