QCD factorization in /B>πK, /ππ decays and extraction of Wolfenstein parameters
Abstract
In the heavyquark limit, the hadronic matrix elements entering nonleptonic Bmeson decays into two light mesons can be calculated from first principles including "nonfactorizable" stronginteraction corrections. The B→πK, ππ decay amplitudes are computed including electroweak penguin contributions, SU(3) violation in the lightcone distribution amplitudes, and an estimate of power corrections from chirallyenhanced terms and annihilation graphs. The results are then used to reduce the theoretical uncertainties in determinations of the weak phases γ and α. In that way, new constraints in the ( ρ̄, η̄) plane are derived. Predictions for the B→πK, ππ branching ratios and CP asymmetries are also presented. A good global fit to the (in part preliminary) experimental data on the branching fractions is obtained without taking recourse to phenomenological models.
 Publication:

Nuclear Physics B
 Pub Date:
 July 2001
 DOI:
 10.1016/S05503213(01)002516
 arXiv:
 arXiv:hepph/0104110
 Bibcode:
 2001NuPhB.606..245B
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 81 pages, LaTeX