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In this article, we calculate the contributions of the vacuum condensates up to dimension-10 in the operator product expansion, and study the Cγ μ  — Cγ ν  type scalar, axial-vector and tensor tetraquark states in details with the QCD sum rules. In calculations, we use the formula  to determine the energy scales of the QCD spectral densities. The predictions  M J = 2 = ( 4.02 - 0.09 + 0.09 ) GeV ,   M J = 1 = ( 4.02 - 0.08 + 0.07 ) GeV favor assigning the Z c (4020) and Z c (4025) as the J PC  = 1 +−  or 2 ++  diquark-antidiquark type tetraquark states, while the prediction  M J = 0 = ( 3.85 - 0.09 + 0.15 ) GeV disfavors assigning the Z(4050) and Z(4250) as the J PC  = 0 ++  diquark-antidiquark type tetraquark states. Furthermore, we discuss the strong decays of the 0 ++ , 1 +− , 2 ++  diquark-antidiquark type tetraquark states in details.

Reanalysis of the Z c (4020), Z c (4025), Z(4050) and Z(4250) as Tetraquark States with QCD Sum Rules*

Reanalysis of the Z _c(4020), Z _c(4025), Z(4050) and Z(4250) as Tetraquark States with QCD Sum Rules*