\begin{document}$M(q^2)$\end{document} for the Dalitz decay \begin{document}$J/\psi\to \gamma^*(q^2)\eta_{(N_f=1)}$\end{document} with \begin{document}$\eta_{(N_f)}$\end{document} being the SU(\begin{document}$N_f$\end{document}) flavor singlet pseudoscalar meson. The difference among the partial widths \begin{document}$\Gamma(J/\psi\to \gamma \eta_{(N_f)})$\end{document} at different \begin{document}$N_f$\end{document} can be attributed in part to the \begin{document}$N_f$\end{document} and quark mass dependences induced by the \begin{document}$\mathbf{U}_A(1)$\end{document} anomaly dominance. \begin{document}$M(q^2)$\end{document} in both \begin{document}$N_f=1,2$\end{document} is well described by the single pole model \begin{document}$M(q^2)=M(0)/(1-q^2/\Lambda^2)$\end{document}. Combined with the known experimental results of the Dalitz decays \begin{document}$J/\psi\to Pe^+e^-$\end{document}, the pseudoscalar mass \begin{document}$m_P$\end{document} dependence of the pole parameter \begin{document}$\Lambda$\end{document} is approximated by \begin{document}$\Lambda(m_P^2)=\Lambda_1(1-m_P^2/\Lambda_2^2)$\end{document} with \begin{document}$\Lambda_1={2.65(5)}~\mathrm{GeV}$\end{document} and \begin{document}$\Lambda_2={2.90(35)}~\mathrm{GeV}$\end{document}. These results provide inputs for future theoretical and experimental studies on the Dalitz decays \begin{document}$J/\psi\to Pe^+e^-$\end{document}."> Form factor for Dalitz decays from <i>J</i>/<i>ψ</i> to light pseudoscalars -
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