Dynamical study of D*DK and D*D D̄ systems at quark level

Inspired by that Belle{2} Collaboration recently reported Tcc, which can be interpreted as a molecular DD*, we investigated the trihadron system of Tcc partner with IJP=01⁻ in the framework of a chiral quark model. It's widely accepted that the main component of $X(3872)$ contains the molecular D̄D*, while the main component of Dₛ₀*(2317) is molecular $DK$. Based on these three well-known exotic states, Tcc (DD*), X(3872) (D̄D*) and Dₛ₀*(2317) (DK), we dynamically investigate D*DK and DD*D̄ systems at quark level to search for possible bound states. The results show that both of them are bound states, in which the binding energy of the molecular state DD^*K is relatively small, only 0.8 MeV, while the binding energy of DD^*D̄ is up to 1.9 MeV. According to the calculation results of the Root-square-mean distances, the spatial structure of the two systems shows obvious (DD^*)-(D̄/K) structure, in which D is close to D^* while DD^* as a whole is relatively distant from the third hadron (D̄/K), which are similar to the nucleon-electron structure. As a result, we strongly recommend that these bound states DD^*D̄ and DD^*K are searched for experimentally.