\begin{document}$\Xi_c$\end{document} baryons (composed of \begin{document}$csu$\end{document} or \begin{document}$csd$\end{document}) have been extensively studied in experiments. In this study, we use state-of-the-art lattice QCD techniques to generate 2+1 clover fermion ensembles with two lattice spacings, \begin{document}$a=(0.108,\; 0.080\;{\rm{fm}})$\end{document}. Then, we present the first ab-initio lattice QCD calculation of the \begin{document}$\Xi_c\to \Xi$\end{document} form factors. Our theoretical results for the \begin{document}$\Xi_{c}\to \Xi \ell^+\nu_{\ell}$\end{document} decay widths are consistent with and approximately two times more precise than the latest measurements by the ALICE and Belle collaborations. Based on the latest experimental measurements, we independently obtain the quark-mixing matrix element \begin{document}$|V_{cs}|$\end{document}, which is in good agreement with results from other theoretical approaches."> First lattice QCD calculation of semileptonic decays of charmed-strange baryons Ξ<sub><i>c</i></sub> -
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