Study of ${\eta }_c$ and ${\eta }_c^{\prime }$ decays into vector meson pairs

Qian Wang, Xiao-Hai Liu, Qiang Zhao

The processes of ${\eta }_c({\eta }_c^{\prime })\to VV$ are supposed to be suppressed by the helicity selection rule (HSR) but found to be rather important decay modes in experiment for ${\eta }_c$. We try…