====== TTP06-26 The first estimate of Bbar -> Xs gamma at O(alpha_s^2) ======
 
 
   <hidden TTP06-26  The first estimate of Bbar -> Xs gamma at O(alpha_s^2) >   Combining our results for various ${\cal O}(\alpha_s^2)$ 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 ${\cal B}({\bar B}\to X_s\gamma) = (3.15 \pm 0.23) \times
   10^{-4}$
   for $E_{\gamma} > 1.6\;$GeV in the ${\bar B}$-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.
 </hidden>
|**M. Misiak, M. Gorbahn, M. Steinhauser et al.**  | 
|**       Phys. Rev. Lett.   (in print)  ()  **  |
| {{preprints:2006:ttp06-26.pdf|PDF}} {{preprints:2006:ttp06-26.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/0609232|arXiv]]   |
| |