The lowest hidden charmed tetraquark state from QCD sum rules

In this paper, we study the [Formula: see text] type scalar tetraquark state [Formula: see text] in detail with the QCD sum rules by calculating the contributions of the vacuum condensates up to dimension 10 in the operator product expansion, and obtain the value [Formula: see text], which is the lowest mass for the hidden charmed tetraquark states from the QCD sum rules. Furthermore, we calculate the hadronic coupling constants GZcηcπand GZcDDwith the three-point QCD sum rules, then study the strong decays Zc→ηcπ, DD, and observe that the total width ΓZc≈21 MeV . The present predictions can be confronted with the experimental data in the future at the BESIII, LHCb and Belle-II.