\begin{document}$ J/\psi \to \gamma ab $\end{document}, where a and b are pseudoscalar mesons. Our approach systematically incorporates final-state rescattering between the pseudoscalar pair \begin{document}$ ab $\end{document}, contributions from intermediate resonances, and coupled-channel effects via rescattering of a with an intermediate state \begin{document}$ \bar{X} $\end{document} (which subsequently decays to \begin{document}$ \gamma b $\end{document}). This formalism ensures unitarity in the two-body rescattering amplitude and dynamically dressed couplings between resonances and the pseudoscalar pair. Using a toy model, we perform numerical calculations and demonstrate that coupled-channel effects significantly influence the lineshape of the invariant mass spectrum of the final states. These findings highlight the necessity of including coupled-channel dynamics in interpretations of \begin{document}$ J/\psi $\end{document} radiative decays."> A unitary coupled-channel approach to <i>J</i>/<i>ψ</i> radiative decay to pseudoscalar pairs -
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