Ultimate survival in anomalous ψ(2S) decays

The hierarchy among the radiative γ(π0,η,η′) decay channels for the ψ′ looks quite different from the J/ψ one. The fate of charm, namely an ultimate survival of on-shell cc¯ intermediate states, might give us the clue for this new puzzle in exclusive charmonium decays. A similar self-preservation has already been invoked in the past to solve the so-called ρπ puzzle.