第十届中国LHC物理会议（CLHCP2024 青岛）

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 ${X(3872)}$. We find that $Z$ is a non-vanishing value within error, which strongly supports that $X(3872)$ has a compact short-distant core.