Interpretation of Zc(4025) as the hidden charm tetraquark states via QCD Sum Rules

By using QCD Sum Rules, we found that the charged hidden charm tetraquark [cu][(c) over bar(d) over bar] states with J(P) = 1(-) and 2(+), which are possible quantum numbers of the newly observed charmonium-like resonance Z(c)(4025), have masses of m(1-)(c) = (4.54 +/- 0.20) GeV and m(2+)(c) = (4.04 +/- 0.19) GeV. The contributions up to dimension eight in the operator product expansion were taken into account in the calculation. The tetraquark mass of J(P) = 2(+) state was consistent with the experimental data of Z(c)(4025), suggesting the Z(c)(4025) state to possess the quantum number of J(P) = 2(+). Extending to the b-quark sector, the corresponding tetraquark masses m(1-)(b) = (10.97 +/- 0.25) GeV and m(2+)(b) = (10.35 +/- 0.25) GeV were obtained, which values are testable in future B-factories.