  A new explanation for the longstanding puzzle of the tiny branching fraction
of psi' --> rho pi relative to that for J/psi --> rho pi was proposed. In the
case of J/psi, we argue that this decay is dominated by a higher Fock state in
which the c cbar pair is in a color-octet ^3S_1 state and annihilates via the
process c cbar --> q qbar. In the case of the psi', we argue that the
probability for the c cbar c pair in this higher Fock state to be close enough
to annihilate is suppressed by a dynamical effect related to the small energy
gap between the mass of the psi' and the D Dbar threshold.
