Measurement of RadiativeJψDecays inKK¯States

The decays $\frac{J}{\ensuremath{\psi}}\ensuremath{\rightarrow}\ensuremath{\gamma}{K}^{+}{K}^{\ensuremath{-}}$ and $\ensuremath{\gamma}{K}_{S}^{0}{K}_{S}^{0}$ have been studied by use of 8.6\ifmmode\times\else\texttimes\fi{}${10}^{6}$ $\frac{J}{\ensuremath{\psi}}'\mathrm{s}$ produced in the DM2 detector. Clean and well-separated signals of ${f}_{2}^{\ensuremath{'}}(1525)$ and ${f}_{2}(1720)$ are observed in both channels and the measured product branching ratios are given. In neither channel is the $\ensuremath{\xi}(2230)$ seen; upper limits are given. Last, an as-yet-unexplained production of events is observed in the ${K}_{S}^{0}{K}_{S}^{0}$ mass spectrum between 2.0 and 2.5 GeV/${\mathit{c}}^{2}$.