Perfect $DD^*$ Molecular Prediction Matching the $T_{\rm cc}$ Observation at LHCb
Ning Li1*, Zhi-Feng Sun2,3,4*, Xiang Liu2,3,4*, and Shi-Lin Zhu5*
1School of Physics, Sun Yat-Sen University, Guangzhou 510275, China 2School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China 3Research Center for Hadron and CSR Physics, Lanzhou University and Institute of Modern Physics of CAS, Lanzhou 730000, China 4Lanzhou Center for Theoretical Physics, Lanzhou University, Lanzhou 730000, China 5School of Physics and Center of High Energy Physics, Peking University, Beijing 100871, China
Abstract：In 2012, we investigated the possible molecular states composed of two charmed mesons [Phys. Rev. D 88 (2013) 114008; 2012 arXiv:1211.5007 [hep-ph]]. The $D^*D$ system with the quantum numbers of $I(J^P)=0(1^+)$ was found to be a good candidate of the loosely bound molecular state. This state is very close to the $D^*D$ threshold with a binding energy around 0.47 MeV. This prediction was confirmed by the new LHCb observation of $T_{\rm cc}^+$ [see Franz Muheim's talk at the European Physical Society conference on high energy physics 2021].
2021, Vol. 38 
