\begin{document}${\eta}_{t}$\end{document} meson at the LHC and the promising prospect of the \begin{document}${\eta}_{t}$\end{document} meson available at the approaching HL-LHC, branching ratios for the \begin{document}${\eta}_{t}$\end{document} \begin{document}${\to}$\end{document} \begin{document}$f\bar{f}$\end{document}, \begin{document}$gg$\end{document}, \begin{document}${\gamma}{\gamma}$\end{document}, \begin{document}$W^{+}W^{-}$\end{document}, \begin{document}$Z^{0}Z^{0}$\end{document}, \begin{document}$Z^{0}{\gamma}$\end{document}, and \begin{document}$Z^{0}H$\end{document} decays are roughly estimated. It is found that tens of opposite-charge dilepton events from the \begin{document}${\eta}_{t}$\end{document} \begin{document}${\to}$\end{document} \begin{document}$W^{+}W^{-}$\end{document} decay and hundreds of events from the \begin{document}${\eta}_{t}$\end{document} \begin{document}${\to}$\end{document} \begin{document}$Z^{0}H$\end{document} \begin{document}${\to}$\end{document} \begin{document}${\ell}^{+}{\ell}^{-}H$\end{document} decay using the single \begin{document}$Z^{0}$\end{document} boson tagging method are expected to be accessible. This estimation provides a reference for future experimental study on the \begin{document}${\eta}_{t}$\end{document} meson."> Searching for the toponium <inline-formula><tex-math id="M1">\begin{document}${{\boldsymbol\eta}_{\boldsymbol t}}$\end{document}</tex-math></inline-formula> with the <inline-formula><tex-math id="M2">\begin{document}${{\boldsymbol\eta}_{\boldsymbol t}}$\end{document}</tex-math></inline-formula> <inline-formula><tex-math id="M3">\begin{document}${\boldsymbol\to}$\end{document}</tex-math></inline-formula> <inline-formula><tex-math id="M4">\begin{document}${{\boldsymbol W}^{\bf +}{\boldsymbol W}^{\bf -}}$\end{document}</tex-math></inline-formula> decay -
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