Exclusive charmonium decays: The J/ψ (ψ’)→ρπ,K/emph>K¯puzzle

We propose a coherent explanation of the puzzle associated with J/ψ (ψ’) decays into vector plus pseudoscalar exclusive final states by assuming the general validity of the perturbative QCD hadron-helicity theorem, but supplemented by violation of this theorem when J/ψ decay to hadrons is mediated by an intermediate gluonium state scrO. The mass of the scrO must be within 100 MeV of the mass of the J/ψ, and its total width must be less than 160 MeV. Comments are made about vector-scalar decays of J/ψ to φ$S^{\mathrm{*}}$ and ρδ. .AE