Study the structure of X(3872) from its lineshape

We fit the invariant mass distribution of \({X(3872)}\rightarrow{J}/{\psi}\pi^+\pi^-\) from LHCb and \({X(3872)}\rightarrow{D}^{0}\overline{D}^{0*}\) from Belle using the propagator for S-wave threshold states in effective field theory. In this way, we can directly determine the \(Z\) which is the probability of finding the compact component in \({X(3872)}\).