Could an axion-like particle be hidden in $\hat{I}{\cdot }_c\to {\hat{I}}^3{\hat{I}}^3$?

Zhi-Jun Li, Zheng-Yun You, Xiao-Rui Lyu

We discuss the possibility of an axion-like particle being merged in the recent observation of $\hat{I}{\cdot }_c\to {\hat{I}}^3{\hat{I}}^3$ at BESIII and find that it cannot be excluded in the current experime…