QCD factorization in /B-->πK, /ππ decays and extraction of Wolfenstein parameters
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 ( ρ¯, η¯) 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/S0550-3213(01)00251-6
- arXiv:
- arXiv:hep-ph/0104110
- Bibcode:
- 2001NuPhB.606..245B
- Keywords:
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- High Energy Physics - Phenomenology
- E-Print:
- 81 pages, LaTeX