First observations of $\psi (2S)$ and ${\chi }_{cJ}(1P)$ decays to four-body final states $h^{+}{h}^{-}{K}_S^0{K}_S^0$

M. Ablikim

${\chi }_{c0}$, ${\chi }_{c1}$, and ${\chi }_{c2}$ decays to ${\pi }^{+}{\pi }^{-}{K}_S^0{K}_S^0$ and $K^{+}{K}^{-}{K}_S^0{K}_S^0$, as well as $\psi (2S)$ decay to ${\pi }^{+}{\pi }^{-}{K}_S^0{K}_S^0$ are presented. The branching fractions of these…