CLEO_2009_I832707
Analysis of the angular distribution of the photons and leptons produced in $e^+e^-\to \psi(2S) \to \gamma\chi_{c(1,2)}$ followed by $\chi_{c(1,2)}\to\gamma J/\psi$ and $J/\psi\to\ell^+\ell^-$ Gives information about the decay and is useful for testing correlations in charmonium decays. N.B. the data was read from the figures in the paper and is not corrected and should only be used qualatively.
