Triple-charm molecular states composed of D∗D∗D and D∗D∗D∗

Inspired by the newly observed Tcc+ state, we systematically investigate the S-wave triple-charm molecular states composed of D∗D∗D and D∗D∗D∗. We employ the one-boson-exchange model to derive the interactions between D(D∗) and D∗ and solve the three-body Schrödinger equations with the Gaussian expansion method. The S-D mixing and coupled channel effects are carefully assessed in our study. Our results show that the I(JP)=12(0-,1-,2-)D∗D∗D and I(JP)=12(0-,1-,2-,3-)D∗D∗D∗ systems could form bound states, which can be viewed as three-body hadronic molecules. We present not only the binding energies of the three-body bound states, but also the root-mean-square radii of D-D∗ and D∗-D∗, which further corroborate the molecular nature of these states. These predictions could be tested in the future at LHC or HL-LHC.