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Report number	hep-ph/0609232 ; IFT-18-2006 ; CERN-PH-TH-2006-184 ; YERPHI-1608-6 ; FREIBURG-THEP-06-13 ; DFTT-20-2006 ; SFB-CPP-06-45 ; TTP06-26 ; ZU-TH-22-06 ; SLAC-PUB-12117 ; DESY-06-168 ; DESY-06-168 ; DESY-2006-168 ; CERN-PH-TH-2006-184 ; IFT-2006-18 ; YERPHI-1608-6 ; Freiburg-THEP-2006-13 ; DFTT-20-2006 ; SFB-CPP-2006-45
Title	Estimate of $BR(\overline{B} \to X_{s}\gamma)$ at $O(\alpha_{s^2})$
Related title	The first estimate of $B(\overline{B} \to X_{s}\gamma)$ at $O(\alpha_{s^2})$: Preprint title
Author(s)	Misiak, M. (Warsaw U. ; CERN) ; Asatrian, H.M. (Yerevan Phys. Inst.) ; Bieri, K. (Bern U.) ; Czakon, M. (Wurzburg U.) ; Czarnecki, A. (Alberta U.) ; Ewerth, T. (Bern U.) ; Ferroglia, A. (Freiburg U.) ; Gambino, P. (INFN, Turin ; Turin U.) ; Gorbahn, M. (Karlsruhe U., TTP) ; Greub, C. (Bern U.) ; Haisch, U. (Zurich U.) ; Hovhannisyan, A. (Yerevan Phys. Inst.) ; Hurth, T. (CERN ; SLAC) ; Mitov, A. (DESY, Zeuthen) ; Poghosyan, V. (Yerevan Phys. Inst.) ; Slusarczyk, M. (Alberta U.) ; Steinhauser, M. (Karlsruhe U., TTP)
Affiliation	(CERN)
Publication	2007
Imprint	22 Sep 2006
Number of pages	4
In:	Phys. Rev. Lett. 98 (2007) 022002
DOI	10.1103/PhysRevLett.98.022002
Subject category	Particle Physics - Phenomenology
Abstract	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.

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