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

Abstract

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 inner structure of $Z_c^{(\prime )}$ via investigating the hidden charm decays of these two $Z_c$ states. We consider the {triangle loop mechanism} contribution in the hidden charm decays of $Z_c^{(\prime )}$. Our estimations indicate that the triangle loop mechanism plays an important role in the decays of the $Z_c^{(\prime )}$, where our results are in agreement with the experimental observations in a reasonable parameter range. Furthermore, we point out that the $Z_c^{(\prime )}$ can be interpreted as the hadronic molecules, while the tetraquark scenario is less favored.