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QCD Factorization in B -> pi K, pi pi Decays and Extraction of Wolfenstein Parameters

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arxiv hep-ph/0104110 v1 pith:NZBTYEEX submitted 2001-04-11 hep-ph

classification hep-ph
keywords amplitudesbranchingcorrectionsdecaysincludingalphaannihilationasymmetries
verification ladder T0 review T1 audit T2 compute T3 formal
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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 $B\to\pi K,\pi\pi$ 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 $\gamma$ and $\alpha$. In that way, new constraints in the $(\bar\rho,\bar\eta)$ plane are derived. Predictions for the $B\to\pi K, \pi\pi$ 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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