Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-04-11
Nucl.Phys.B606:245-321,2001
Physics
High Energy Physics
High Energy Physics - Phenomenology
81 pages, LaTeX
Scientific paper
10.1016/S0550-3213(01)00251-6
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.
Beneke Martin
Buchalla Gerhard
Neubert Matthias
Sachrajda Chris T.
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