ψ(2S) Decays into $\J$ plus Two Photons

BES collaboration

Using $γγJ/ψ, J/ψ\ra e^+ e^-$ and ${\mu }^{+}{\mu }^{-}$ events from a sample of $14.0\times 10^6$ $\psip$ decays collected with the BESII detector, the branching fractions for $\psip\ra π^0\J$…