Estimate of $BR(\overline{B} \to X_{s}\gamma)$ 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...

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Detalles Bibliográficos
Autores principales: 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.
Lenguaje:eng
Publicado: 2006
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.98.022002
http://cds.cern.ch/record/985382
Descripción
Sumario: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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