\begin{document}$ D_s $\end{document}, \begin{document}$ \eta_c $\end{document} and vector mesons \begin{document}$ D^* $\end{document}, \begin{document}$ D_s^* $\end{document}, \begin{document}$ J/\psi $\end{document} are determined from the \begin{document}$ N_f=2+1 $\end{document} lattice QCD at a lattice spacing \begin{document}$ a\sim0.08 $\end{document} fm. For vector mesons, the decay constants defined by tensor currents are given in the \begin{document}$ {{\overline{{\rm{MS}}}}} $\end{document} scheme at \begin{document}$ 2 $\end{document} GeV. The calculation is performed on domain wall fermion configurations generated by the RBC-UKQCD collaborations and the overlap fermion action is used for the valence quarks. Comparing the current results with our previous results at a coarser lattice spacing \begin{document}$ a\sim0.11 $\end{document} fm provides a better understanding of the discretization error. We obtain \begin{document}$ f_{D_s^*}^T({{\overline{{\rm{MS}}}}},\text{ 2 GeV})/f_{D_s^*}=0.909(18) $\end{document} with a better precision than our previous result. Combining our \begin{document}$ f_{D_s^*}=277(11) $\end{document} MeV with the total width of \begin{document}$ D_s^* $\end{document} determined in a recent study gives a branching fraction \begin{document}$ 4.26(52)\times10^{-5} $\end{document} for \begin{document}$ D_s^* $\end{document} leptonic decay."> Charm physics with overlap fermions on 2+1-flavor domain wall fermion configurations -
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