Search for $J/\psi \to K_S^0{K}_S^0$ and $\psi (3686)\to K_S^0{K}_S^0$

BESIII Collaboration, M. Ablikim, M. N. Achasov +678

Using data samples of $(10087\pm 44)\times 10^6$ $J/\psi$ events and $(2712.4\pm 14.3)\times 10^6$ $\psi (3686)$ events collected with the BESIII detector at the BEPCII collider, we sea…