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Recently, the BESIII Collaboration reported a new measurement of the $\eta_c\rho$ decay mode of $Z_c^{(\prime)}$, which motivated us to study the innerstructure of $Z_c^{(\prime)}$ via investigating the hidden charm decays ofthese two $Z_c$ states. We consider the {triangle loop mechanism} contributionin the hidden charm decays of $Z_c^{(\prime)}$. Our estimations indicate thatthe triangle loop mechanism plays an important role in the decays of the$Z_c^{(\prime)}$, where our results are in agreement with the experimentalobservations in a reasonable parameter range. Furthermore, we point out thatthe $Z_c^{(\prime)}$ can be interpreted as the hadronic molecules, while thetetraquark scenario is less favored.

Understanding the $\eta_c\rho$ decay mode of $Z_c^{(\prime)}$ via the triangle loop mechanism