The lowest hidden charmed tetraquark state from QCD sum rules

In this paper, we study the S (S) over bar type scalar tetraquark state cq (c) over bar(q) over bar 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 MZ(c) = (3.82(-0.08)(+0.08)) GeV,which is the lowest mass for the hidden charmed tetraquark states from the QCD sum rules. Furthermore, we calculate the hadronic coupling constants G(Zc eta e)pi and G(ZcDD) with the three-point QCD sum rules, then study the strong decays Z(c)->eta(c)pi, DD, and observe that the total width Gamma Z(c) approximate to 21 MeV. The present predictions can be confronted with the experimental data in the future at the BESIII, LHCb and Belle- II.