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The Higgs boson decay channel, $H\to\gamma\gamma$, is one of the mostimportant channels for probing the properties of the Higgs boson. In the paper,we reanalyze its decay width by using the QCD corrections up to$\alpha_s^4$-order level. The principle of maximum conformality has beenadopted to achieve a precise pQCD prediction without conventionalrenormalization scheme-and-scale ambiguities. By taking the Higgs mass as theone given by the ATLAS and CMS collaborations, i.e.$M_{H}=125.09\pm0.21\pm0.11$ GeV, we obtain $\Gamma(H\to \gamma\gamma)|_{\rmLHC}=9.364^{+0.076}_{-0.075}$ KeV.

Properties of the decay $H\to\gamma\gamma$ using the approximate $\alpha_s^4$-corrections and the principle of maximum conformality