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η decays of the ψ's, vector meson dominance and colour theory

With the aid of simple vector meson dominance the authors extract from experiment the couplings of the psi ' psi eta complex. The predictions for these couplings of the Han-Nambu colour theory are derived and shown to be in conflict with the phenomenological values. Possible resolutions of this discrepancy in terms of more sophisticated versions of vector dominance are discussed.