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