Estimate of BR(B -> X_s gamma) at O(alpha_s^2)
High Energy Physics - Phenomenology
2008-11-26 v2
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.
Keywords
Cite
@article{arxiv.hep-ph/0609232,
title = {Estimate of BR(B -> X_s gamma) at O(alpha_s^2)},
author = {M. Misiak and H. M. Asatrian and K. Bieri and M. Czakon and A. Czarnecki and T. Ewerth and A. Ferroglia and P. Gambino and M. Gorbahn and C. Greub and U. Haisch and A. Hovhannisyan and T. Hurth and A. Mitov and V. Poghosyan and M. Slusarczyk and M. Steinhauser},
journal= {arXiv preprint arXiv:hep-ph/0609232},
year = {2008}
}
Comments
4 pages, 4 figures. Version accepted by the PRL. Words disallowed by the journal removed from the title. References updated and a note added