Experimental road of the $J/\ddot{I}ˆ\ddot{I}•$ mass spectrum, current status, and implications

Hongjian Zhou, Xining Wang, Feng Zhu +3

Inspired by the $X(4140)$ structure reported in the $J/\ddot{I}ˆ\ddot{I}•$ system by the CDF experiment in 2009, a series of searches have been carried out in the $J/\ddot{I}ˆ\ddot{I}•$ and $J/\ddot{I}ˆK$ channels,…