  To identify the nature of the newly observed charged resonance Zc(4200), we
study its hadronic decays Zc(4200) -> J/psi pi, Zc(4200) -> eta_c rho and
Zc(4200) -> D bar D* as a charmonium-like tetraquark state. In the framework of
the QCD sum rules, we calculate the three-point functions and extract the
coupling constants and decay widths for these interaction vertices. Including
all these channels, the full decay width of the Zc(4200) state is consistent
with the experimental value reported by the Belle Collaboration, supporting the
tetraquark interpretation of this state.
