Estimate of B(B(over) -->Xgamma) at O(alpha(s)2) |
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| Authors: | Misiak M Asatrian H M Bieri K Czakon M Czarnecki A Ewerth T Ferroglia A Gambino P Gorbahn M Greub C Haisch U Hovhannisyan A Hurth T Mitov A Poghosyan V Slusarczyk M Steinhauser M |
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| Institution: | Institute of Theoretical Physics, Warsaw University, PL-00-681 Warsaw, Poland and Theoretical Physics Division, CERN, CH-1211 Geneva 23, Switzerland. |
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| Abstract: | Combining our results for various O(alphas]) 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(Bover ]-->Xs]gamma)=(3.15+/-0.23) x 10(-4) for Egamma>1.6 GeV in the Bover ]-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. |
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