Uniform Treatment of Pion Electro- and Photoproduction in Regge Theory
- 25 July 1969
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 183 (5), 1425-1430
- https://doi.org/10.1103/physrev.183.1425
Abstract
The problems associated with the conventional kinematical interpretation of the pion pole in Regge theory are studied. It is found that a formulation leading to a dynamical interpretation is possible in an approach which emphasizes the Lorentz-invariance interpretation of gauge invariance. This approach leads to a uniform treatment of pion production by real and virtual photons in the sense that the former is demanded to be the zero-mass limit of the latter in a manner consistent with Lorentz-invariance requirements on helicity amplitudes, as suggested by Weinberg. Our formula for the meson Regge pole has a singularity at which explicitly comes from a factor , rather than the kinematical factor used in recent phenomenological analyses. Comments are made on some features arising from gauge invariance which are analogous to perturbation theory.
Keywords
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