Abstract
A covariant formulation of the vector meson dominance hypothesis in terms of invariant amplitudes is presented. It is shown that explicit continuation in the external vector mass of the kinematical coefficients relating the invariant and helicity amplitudes allows the prediction of π −p→ ϱ 0n from charged pion photoproduction. Such predictions from a detailed fit to pion photoproduction, with the assumption that the extrapolation of the invariant amplitudes is free from dynamical dependence on the ϱ mass, are shown to be in excellent agreement with the ϱ 0 production data.
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