Perfect DD^* Molecular Prediction Matching the T_\rm cc Observation at LHCb

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.