Covariant tensor formalism for partial wave analyses of $\psi$ decays   into $\gamma\gamma V$
  The double radiative decays $\psi\to\gamma\gamma V$ with $V\equiv \rho,\omega,\phi$ have a potential to provide information on the flavor content of any meson resonances (R) with positive charge parity ($C=+$) and mass above 1 GeV through $\psi\to\gamma R \to\gamma\gamma V$. To get the information, one needs both high statistic data and partial wave analysis (PWA). While high statistic data will be available soon at CLEO-c and BES-III, here we provide theoretical PWA formulae for these $\psi$ double radiative decay channels in the covariant tensor formalism. 
Sayipjamal Dulat, Bing-Song Zou and Ji-Min Wu