Improved measurements of branching fractions for ${\eta }_c\to \varphi \varphi$ and $\omega \varphi$

M. Ablikim, M. N. Achasov, X. C. Ai +419

Using $(223.7\pm 1.4)\times 10^6$ J/$\psi$ events accumulated with the BESIII detector, we study ${\eta }_c$ decays to $\varphi \varphi$ and $\omega \varphi$ final states. The branching fraction of ${\eta }_c\to \varphi \varphi$ is meas…