\begin{document}$ \eta_c $\end{document}) and scalar (\begin{document}$ \chi_{c0} $\end{document}) charmonium using two ensembles of \begin{document}$ N_f = 2 $\end{document} twisted mass lattice QCD gauge configurations. The simulation is performed using two lattice ensembles with lattice spacings \begin{document}$ a = 0.067 $\end{document} fm with size \begin{document}$ 32^3\times{64} $\end{document} and \begin{document}$ a = 0.085 $\end{document} fm with size \begin{document}$ 24^3\times{48} $\end{document}. The decay widths for the two charmonia are obtained within the expected ballpark, but are however smaller than the experimental ones. Possible reasons for these discrepancies are discussed."> Lattice study of two-photon decay widths for scalar and pseudo-scalar charmonium -
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