Search for the $X(2370)$ and observation of ${\eta }_c\to \eta \eta {\eta }^{\prime }$ in $J/\psi \to \gamma \eta \eta {\eta }^{\prime }$

BESIII Collaboration, M. Ablikim, M. N. Achasov +491

Using a sample of $1.31\times 10^{9}J/\psi$ events collected with the BESIII detector, we perform a study of $J/\psi \to \gamma \eta \eta {\eta }^{\prime }$ to search for the $X(2370)$ and ${\eta }_c$ in the $ηηη…