Branching fraction measurement of J/ψ→KSKL and search for J/ψ→KSKS
Mikhail N. Achasov, S. Ahmed, M. Albrecht, M. Alekseev et autres
Using a sample of $1.31\ifmmode\times\else\texttimes\fi{}{10}^{9}\text{ }\text{ }J/\ensuremath{\psi}$ events collected with the BESIII detector at the BEPCII collider, we study the decays of $J/\ensuremath{\psi}\ensuremath{\rightarrow}{K}_{S}{K}_{L}$ and ${K}_{S}{K}_{S}$. The branching fraction of $J/\ensuremath{\psi}\ensuremath{\rightarrow}{K}_{S}{K}_{L}$ is determined to be $\mathcal{B}(J/\ensuremath{\psi}\ensuremath{\rightarrow}{K}_{S}{K}_{L})=(1.93\ifmmode\pm\else\textpm\fi{}0.01(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.05(\mathrm{syst}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, which significantly improves on previous measurements. No …
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