Corrections of order O(bar alpha bar alpha _s ) and O(overline alpha ^2 ) to the bar bb-decay width of the neutral Higgs boson

Analytical expressions are presented for contributions of order $O(overline alpha overline alpha _s )$ and $O(overline alpha ^2 )$ to the $bar bb$ -decay width of the neutral Higgs boson of the standard model of electroweak interactions. The numerical value of the mixed QED and QCD correction of order $O(overline alpha overline alpha _s )$ is comparable to other computed terms in the perturbation series.