Experimental road of the $J/\psi \varphi$ mass spectrum, current status, and implications

Hongjian Zhou, Xining Wang, Feng Zhu +3

Inspired by the $X(4140)$ structure reported in the $J/\psi \varphi$ system by the CDF experiment in 2009, a series of searches have been carried out in the $J/\psi \varphi$ and $J/\psi K$ channels, leadi…