Abstract
A formulation of generalized vector dominance (GVD), consistent with the parton model (PM) for deep inelastic electroproduction, is presented. The parton distributions at small x are correctly predicted in terms of the photoabsorption parameters. It is found that no charmed partons exist in the sea of the nucleon. The pomeron − ϕ c coupling and the ϕ c − photoproduction cross section are negligible. The ratio σ L/ σ T for deep inelatic and diffractive electroproduction is found to be small. This is related to the prediction that the highest Regge singularity coupled to longitudinal vector mesons is a cut with intercept minus one. In the time-like region it implies that the angular distribution in e +e −→ π + X is ∼ (3−cos 2 Θ), in consistence with experiment and disagreement with PM. Finally the large value of σ(e +e − → hadrons) is attributed to a series of ϕ c 's.
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