Ultimate survival in anomalous psi(2S) decays

Abstract

The hierarchy among the radiative $\gamma$($\pi^0$, $\eta$, $\eta^{\prime}$) decay channels for the $\psi^{\prime}$ looks quite different from the $J/\psi$ one. The fate of charm, namely an ultimate survival of on-shell $c \bar{c}$ 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 $\rho \pi$ puzzle.