$D^{\pm }{D}^{\ast \mp }$ Hadronic Atom as a Key to Revealing the $X(3872)$ Mystery

Zhen-Hua Zhang, Feng-Kun Guo

The $X(3872)$, whose mass coincides with the $D^0{\bar{D}}^{\ast 0}$ threshold, is the most extended hadron object. Since its discovery in 2003, debates have never stopped regarding its i…