Estimate of BR(B -> X_s gamma) at O(alpha_s^2)
  Combining our results for various O(alpha_s^2) 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 BR(B -> X_s gamma) = (3.15 +_ 0.23) x 10^-4 for E_gamma > 1.6 GeV in the B-meson rest frame. The four types of uncertainties: non-perturbative (5%), parametric (3%), higher-order (3%) and m_c-interpolation ambiguity (3%) have been added in quadrature to obtain the total error. 
M.Misiak, H.M.Asatrian, K.Bieri, M.Czakon, A.Czarnecki, T.Ewerth,   A.Ferroglia, P.Gambino, M.Gorbahn, C.Greub, U.Haisch, A....