THE EFFECTS OF THE QCD CORRECTIONS TO GAMMA(H(0)-]B(B)OVER-BAR)

We consider in detail various theoretical uncertainties of the perturbative predictions for the decay width of H-0 --> bbBAR process in the region 60 GeV < M(H) less-than-or-equal-to 2 M(W). We calculate the order O(alpha(s)2)-contributions to the expression for GAMMA(HbbBAR) through the pole b-quark mass mb and demonstrate that they are important for the elimination of the numerical difference between the corresponding expression and the renormalization-group (RG) which can be improved by the running b-quark mass. In the case of m(b) = 4.8 GeV and LAMBDA(5)/MS = 150 (250) MeV we observe the identical cancellation of the next-to-leading order RG-improved corrections to GAMMA(HbbBAR) at M(ch) = 130 (65) GeV and the indications to the asymptotic explosion of the corresponding next-to-next-to-leading parametrization. The theoretical importance of the order O(m(b)2/M(H)2) massive corrections to GAMMA(HbbBAR) for modeling the threshold effects is demonstrated.