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In this article, we study the decays $\psi^{\prime}\to {J/\psi}\pi^+\pi^-$and $\eta_c^{\prime}\to {\eta_c}\pi^+\pi^-$ by taking into account the chiralsymmetry breaking effects, the final-state interactions and the heavy quarksymmetry. We can confront the predictions of the $\eta_c^{\prime}\to \eta_c\pi^+\pi^-$ decay width and differential decay width with the experimental datain the future, and obtain powerful constraints on the chiral breaking effectsand the final-state interactions, and test the heavy quark symmetry.

Analysis of the decays $\psi^{\prime}\to {J/\psi}\pi^+\pi^-$ and $\eta_c^{\prime}\to {\eta_c}\pi^+\pi^-$ with the heavy quark symmetry