QCD factorization in B→πK, ππ decays and extraction of Wolfenstein parameters
2001; Elsevier BV; Volume: 606; Issue: 1-2 Linguagem: Inglês
10.1016/s0550-3213(01)00251-6
ISSN1873-1562
AutoresΜ. Beneke, Gerhard Buchalla, Matthias Neubert, C.T. Sachrajda,
Tópico(s)High-Energy Particle Collisions Research
ResumoIn 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.
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