\begin{document}$ \sqrt{s}=3.773 $\end{document} GeV. The ALPs are assumed to originate from \begin{document}$ D^\pm $\end{document}-meson decays in association with a charged pion. We perform both truth-level and detector-level Monte Carlo simulations and determine the expected sensitivity to the mixing parameter between the HNL and the electron neutrino, \begin{document}$ |V_{eN}|^2 $\end{document}, using a displaced-vertex search at STCF. We find that STCF can probe values of \begin{document}$ |V_{eN}|^2 $\end{document} approximately one to two orders of magnitude beyond existing bounds. We also perform an approximate reinterpretation of a search for HNLs at the CHARM experiment, which is subject to model-dependent assumptions about the production and kinematic distributions, and find that beam-dump experiments may provide strong complementary constraints."> Long-lived sterile neutrinos from axionlike particles at the Super Tau–Charm Facility -
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