\begin{document}$ tqZ $\end{document} couplings via two production processes yielding trilepton signals: top quark pair production \begin{document}$ pp\to t\bar{t} $\end{document} with one top quark decaying to the Z boson and one light jet and the anomalous single top quark plus Z boson production process \begin{document}$ pp\to tZ $\end{document}. We study these channels at various successors of the Large Hadron Collider (LHC), i.e., the approved High-Luminosity LHC (HL-LHC) as well as the proposed High-Energy LHC (HE-LHC) and Future Circular Collider in hadron-hadron mode (FCC-hh). We perform a full simulation for the signals and the relevant Standard Model (SM) backgrounds and obtain limits on the Branching Ratios (BRs) of \begin{document}$ t\to qZ\; (q = u,c) $\end{document}, eventually yielding a trilepton final state through the decay modes \begin{document}$ t\to b W^{+}\to b\ell^{+}\nu_{\ell} $\end{document} and \begin{document}$ Z\to \ell^{+}\ell^{-} $\end{document}. The upper limits on these FCNC BRs at 95% Confidence Level (CL) are obtained at the HL-LHC with \begin{document}$ \sqrt s = 14 $\end{document} TeV and 3 ab−1, at the HE-LHC with \begin{document}$ \sqrt s = 27 $\end{document} TeV and 15 ab−1, and at the FCC-hh with \begin{document}$ \sqrt s = 100 $\end{document} TeV and 30 ab−1."> Probing <i>tqZ</i> anomalous couplings in the trilepton signal at the HL-LHC, HE-LHC, and FCC-hh -
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