\begin{document}$ H\to gg $\end{document} up to \begin{document}$ \alpha_s^6 $\end{document}-order QCD corrections by using the newly suggested infinite-order scale-setting approach, which is based on both the principle of maximum conformality and intrinsic conformality. This approach is called PMC\begin{document}$ _\infty $\end{document}. By using the PMC\begin{document}$ _\infty $\end{document} approach, we observed that the conventional renormalization scale ambiguity in perturbative QCD calculation is eliminated, and the residual scale dependence due to unknown higher-order terms can also be highly suppressed. We then obtained an accurate perturbative QCD prediction on the total decay width, e.g., \begin{document}$ \Gamma (H \to gg)|_{\rm PMC_\infty} =336.42^{+7.01}_{-6.92} $\end{document} keV, where the errors are squared averages of those from all the mentioned error sources."> Total decay width of <inline-formula><tex-math id="M1">\begin{document}${\boldsymbol{H} \boldsymbol\to \boldsymbol{gg} }$\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/03a4d060-a542-4fcf-9a04-cd6e8a353073/CPC-2022-0261_M1.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="//www.macurncorp.com/hepnp/article/app/id/03a4d060-a542-4fcf-9a04-cd6e8a353073/CPC-2022-0261_M1.png"/></alternatives></inline-formula> using the infinite-order scale-setting approach based on intrinsic conformality -
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