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This paper presents a method for the analysis of process $J/\psi \rightarrow\rho\pi \rightarrow \pi^+\pi^-\pi^0$ based on the consideration of the anglesof expansion of finite pion pairs. The proposed approach makes it possible toeffectively carry out selection of events in both neutral and charge-conjugatemodes of the decay of $J/\psi \rightarrow \rho\pi$. Application of the methodfor the analysis of similar three-body decays in some cases will simplify theanalysis and refine current results.

On the question of the analysis of $J/\psi \rightarrow \rho\pi \rightarrow \pi^+\pi^-\pi^0$