New measurement of exclusive decays of theχc0andχc2to two-meson final states

Using a sample of $2.59\ifmmode\times\else\texttimes\fi{}{10}^{7}$ $\ensuremath{\psi}(2S)$ decays collected by the CLEO-c detector, we present results of a study of ${\ensuremath{\chi}}_{c0}$ and ${\ensuremath{\chi}}_{c2}$ decays into two-meson final states. We present the world's most precise measurements of the ${\ensuremath{\chi}}_{cJ,(J=0,2)}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, ${\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$, ${K}^{+}{K}^{\ensuremath{-}}$, ${K}_{S}^{0}{K}_{S}^{0}$, $\ensuremath{\eta}\ensuremath{\eta}$, and ${\ensuremath{\eta}}^{\ensuremath{'}}{\ensuremath{\eta}}^{\ensuremath{'}}$ branching fractions, and a search for ${\ensuremath{\chi}}_{c}$ decays into $\ensuremath{\eta}{\ensuremath{\eta}}^{\ensuremath{'}}$. These results shed light on the mechanism of charmonium decays into pseudoscalar mesons.