Two-body strong decays of the hidden-charm tetraquark molecular states via QCD sum rules*

Abstract In this study, we extend our previous study on the molecular states with , , and to investigate their two-body strong decays via the QCD sum rules based on rigorous quark-hadron duality. We obtain the partial decay widths and, therefore, the total widths of the ground states with , , and , which indicate that it is reasonable to assign as the tetraquark molecular states with .