X(6900) peak could be a molecular state

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 Flatte-like parametrization. The use of the pole-counting rule and spectral density function sum rule give consistent conclusions that X(6900) may not be a molecule of J/psi psi(3686). Nevertheless, it is still possible that X(6900) is a molecule of higher states, such as J/psi psi(3770), chi(c0)chi(c2), etc.