The branching ratios and the ratios of the helicity amplitudes (x and y) of the processes &→γVV are calculated. The calculated branching ratio for &→γρ ${}_{}{}^0{}_{}{}^{}\mathrm{\rho }_{}^0{}_{}{}^{}$ is compatible with the recent experimental data and its y value is quite distinct from those measured in J/ψ→γθ→γηη,γKK¯. The processes &→γω ω,γ$K^{\mathrm{*}}$K${¯}^{\mathrm{*}}$ are predicted to have large branching ratios and could be found in J/ψ radiative decays. The branching ratio for &→γφ φ is calculated to be smaller than that of &→γρ ${}_{}{}^0{}_{}{}^{}\mathrm{\rho }_{}^0{}_{}{}^{}$ by two orders of magnitude.

• Received 17 December 1984

DOI:https://doi.org/10.1103/PhysRevD.32.308