  To understand the short-distance vs long-distance final-state interactions,
we have performed a detailed amplitude analysis for the two-body decay, J/psi
into vector and pseudoscalar mesons. The current data favor a large relative
phase nearly 90 degrees between the three-gluon and one-photon decay
amplitudes. The source of this phase is apparently in the long-distance
final-state interaction. Nothing anomalous is found in the magnitudes of the
three-gluon and one-photon amplitudes. We discuss implications of this large
relative phase in the weak decay of heavy particles.
