We compute next-to-leading order QCD corrections to the CP asymmetry a_{fs} = Im(Gamma_{12}/M_{12}) in flavour-specific B_{d,s} decays such as B_d->X l nu or B_s->D^-_s pi^+. The corrections reduce the uncertainties associated with the choice of the renormalization scheme for the quark masses significantly. In the Standard Model we predict a^d_{fs} = -(5.0 +- 1.1)*10^{-4}. As a by-product we also obtain the width difference in the B_d system at next-to-leading order in QCD.
@article{arxiv.hep-ph/0307344,
title = {CP asymmetry in flavour-specific B decays beyond leading logarithms},
author = {M. Beneke and G. Buchalla and A. Lenz and U. Nierste},
journal= {arXiv preprint arXiv:hep-ph/0307344},
year = {2008}
}
Comments
12 pages, 3 figures; error in NLO calculation corrected