QCD factorization in B→πK , ππ decays and extraction of Wolfenstein parameters

M. Beneke, G. Buchalla, M. Neubert, C. T. Sachrajda

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976 Scopus citations

Abstract

In the heavy-quark limit, the hadronic matrix elements entering nonleptonic B-meson decays into two light mesons can be calculated from first principles including "nonfactorizable" strong-interaction corrections. The B→πK,ππ decay amplitudes are computed including electroweak penguin contributions, SU(3) violation in the light-cone distribution amplitudes, and an estimate of power corrections from chirally-enhanced 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.

Original languageEnglish
Pages (from-to)245-321
Number of pages77
JournalNuclear Physics, Section B
Volume606
Issue number1-2
DOIs
StatePublished - 9 Jul 2001
Externally publishedYes

Keywords

  • 13.25.Hw

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