2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/179171We propose a new explanation for the longstanding puzzle of the tiny branching fraction of psi' -> rho pi relative to that for J/psi -> rho pi. In the case of J/psi, we argue that this decay is dominated by a higher Fock state in which the ccbar pair is in a color-octet ^3S_1 state and via annihilate process ccbar -> qqbar. In the case of the psi', we argue that the probability for the ccbar 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 DDbar threshold.9 pages, cut the paper, small change to the discussion about psi' suppresion mechanismHigh Energy Physics - PhenomenologyHigh Energy Physics - Experimenttext