QCD SUM RULES FOR THE $Z_c^+(3900)$ STATE

2014 
We use the QCD sum rules to study the recently observed charmonium-like structure $Z_c^+(3900)$ as a tetraquark state. We evaluate the three-point function and extract the coupling constants of the $Z_c^+ \, J/\psi \, \pi^+$, $Z_c^+ \, \eta_c \, \rho^+$ and $Z_c^+ \, D^+\bar{D}^{*0}$ vertices and the corresponding decay widths in these channels. The results obtained are in good agreement with the experimental data and supports to the tetraquark picture of this state.
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