\begin{document}$ \chi_{c0} \rightarrow 2\gamma $\end{document} decay width using a model-independent method that does not require the momentum extrapolation of corresponding off-shell form factors. The simulation is performed on ensembles of \begin{document}$ N_f = 2 $\end{document} twisted mass lattice QCD gauge configurations with three different lattice spacings. After the continuum extrapolation, the decay width is obtained to be \begin{document}$ \Gamma_{\gamma\gamma}(\chi_{c0}) = 3.65(83)_{\mathrm{stat}}(21)_{\mathrm{lat.syst}}(66)_{\mathrm{syst}}\, \rm{keV} $\end{document}. Regardless of this large statistical error, our result is compatible with the experimental results within 1.3σ. Potential improvements of the lattice calculation in the future are also discussed."> Lattice calculation of <i>χ</i><sub><i>c</i>0</sub> → 2<i>γ</i> decay width -
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