\begin{document}$J/\psi$\end{document} and \begin{document}$\psi(2S)$\end{document} in the quark gluon plasma (QGP) produced by \begin{document}$\sqrt{s_{\rm NN}}=5.02$\end{document} TeV Pb-Pb collisions. The \begin{document}$J/\psi$\end{document} nuclear modification factors are studied in detail alongside the mechanisms of primordial production and the recombination of charm and anti-charm quarks in the thermal medium. The \begin{document}$\psi(2S)$\end{document} binding energy is much smaller in the hot medium compared to the ground state; thus, \begin{document}$\psi(2S)$\end{document} with middle to low \begin{document}$p_{\rm T}$\end{document} can be thermally regenerated in the later stages of QGP expansions, enabling \begin{document}$\psi(2S)$\end{document} to inherit larger collective flows from the bulk medium. We quantitatively study the nuclear modification factors of both \begin{document}$J/\psi$\end{document} and \begin{document}$\psi(2S)$\end{document} in different centralities and transverse momentum bins for \begin{document}$\sqrt{s_{\rm NN}}=5.02$\end{document} TeV Pb-Pb collisions."> Thermal production of charmonia in Pb-Pb collisions at <inline-formula><tex-math id="M1">\begin{document}${ \sqrt{{ s}_{\bf{ {\rm NN}}}}{\bf {=5.02}}}$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/cpc/article/app/id/2898c8af-a210-406e-9ace-b148f1335624/CPC-2019-0226_M1.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/cpc/article/app/id/2898c8af-a210-406e-9ace-b148f1335624/CPC-2019-0226_M1.png"/></alternatives></inline-formula> TeV -
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