The $X(6900)$ peak could be a molecular state

Ye Lu, Chang Chen, Kai-Ge Kang +2

The analyses of the LHCb data on $X(6900)$ found in di-$J/\psi$ and $J/\psi \psi (3686)$ systems are performed using a momentum-dependent {Flatté}-like parameterization. The use of the pole c…