\begin{document}$5.9\times 10^{11}$\end{document} η events could be produced during a one-month operation of the experiment. The hadronic production of η mesons (\begin{document}$p + ^7\text{Li} \rightarrow \eta X$\end{document}) was simulated at a beam energy of 1.8 GeV using the GiBUU event generator. We searched for light dark scalar particles through rare decay channels, namely \begin{document}$\eta \rightarrow S \pi^0 \rightarrow \pi^+ \pi^- \pi^0$\end{document} and \begin{document}$\eta \rightarrow S \pi^0 \rightarrow e^+ e^- \pi^0$\end{document}. The detection efficiencies of the channels and the spectrometer resolutions were studied in the simulation. We also present the projected upper limits of the decay branching ratios of the dark scalar particle and the projected sensitivities to the model parameters."> Simulation of dark scalar particle sensitivity in <i>η</i> rare decay channels at HIAF -
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