Estimate of B((B)over-bar→Xsγ) at O(αs2)

Combining our results for various O(alpha(2)(s)) corrections to the weak radiative B-meson decay, we are able to present the first estimate of the branching ratio at the next-to-next-to-leading order in QCD. We find B((B) over bar -> X-s gamma) = (3.15 +/- 0.23) x 10(-4) for E-gamma > 1.6 GeV in the (B) over bar -meson rest frame. The four types of uncertainties: nonperturbative (5%), parametric (3%), higher-order (3%), and m(c)-interpolation ambiguity (3%) have been added in quadrature to obtain the total error.