Higgs boson decay into bottom quarks and uncertainties of perturbative QCD predictions

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Different methods for treating the results of higher-order perturbative QCD calculations of the decay width of the Standard Model Higgs boson into bottom quarks are discusssed. Special attention is paid to the analysis of the Mₕ dependence of the decay width Γ(H→ bb) in the cases when the mass of b-quark is defined as the running parameter in the MS-scheme and as the quark pole mass. The relation between running and pole masses is taken into account in the order αₛ⁴-approximation. Some special features of applications of Analytical Perturbation Theory (APT) are commented.