\begin{document}$ \Gamma(H\to gg) $\end{document} up to its five-loop QCD contribution, to demonstrate the behavior of the gauge dependence before and after applying the PMC. Interaction vertices are chosen to define five different MOM schemes: mMOM, MOMh, MOMq, MOMg, and MOMgg. Under these MOM schemes, we obtain \begin{document}$ \Gamma(H \to gg)|^{\rm{mMOM}}_{\rm{PMC}} =$\end{document}\begin{document}$332.8{^{+11.6}_{-3.7}}\pm7.3\; \rm{keV}$\end{document}, \begin{document}$ \Gamma(H \to gg)|^{\rm{MOMh}}_{\rm{PMC}} = 332.8{^{+27.5}_{-34.6}}\pm7.3\; \rm{keV} $\end{document}, \begin{document}$ \Gamma(H \to gg)|^{\rm{MOMq}}_{\rm{PMC}} = 332.9{^{+27.4}_{-34.7}}\pm 7.3\; \rm{keV} $\end{document}, \begin{document}$ \Gamma(H \to gg)|^{\rm{MOMg}}_{\rm{PMC}} = 332.7{^{+27.5}_{-34.6}}\pm7.3\; \rm{keV} $\end{document}, and \begin{document}$ \Gamma(H \to gg)|^{\rm{MOMgg}}_{\rm{PMC}} = 337.9{^{+1.2}_{-1.7}}\pm 7.7\; \rm{keV} $\end{document}; here, the central values correspond to the Landau gauge with the gauge parameter \begin{document}$ \xi^{\rm MOM} = 0 $\end{document}, the first errors correspond to \begin{document}$ \xi^{\rm MOM}\in[-1,1] $\end{document}, and the second ones arise through taking \begin{document}$ \Delta \alpha_s^{\overline{\rm MS}}(M_Z) = \pm0.0011 $\end{document}. The uncertainty of the Higgs mass \begin{document}$ \Delta M_H = 0.24\; \rm{GeV} $\end{document} causes an extra error of \begin{document}$ \sim \pm1.7 $\end{document} (or \begin{document}$ \sim\pm1.8 $\end{document}) keV for all the aforementioned MOM schemes. It is found that the Higgs decay width \begin{document}$ \Gamma (H\to gg) $\end{document} depends very weakly on the choice of MOM scheme, which is consistent with renormalization group invariance. It is found that the gauge dependence of \begin{document}$ \Gamma(H\to gg) $\end{document} under the \begin{document}$ \rm{MOMgg} $\end{document} scheme is less than ±1%, which is the smallest gauge dependence among all the aforementioned MOM schemes."> Gauge dependence of the perturbative QCD predictions under the momentum-space subtraction scheme -
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