Reexamining $ B\to ππ,πK$ Decays in QCD Factorization Approach

Details Reexamining $ B\to ππ,πK$ Decays in QCD Factorization Approach Reexamining $ B\to ππ,πK$ Decays in QCD Factorization Approach

2005-08-05

arxiv.org/abs/hep-ph/0508079v2

Phys.Rev. D72 (2005) 074007

Physics

High Energy Physics

High Energy Physics - Phenomenology

43 pages, 19 eps figures. Typos corrected. Final version published in PRD72, 074007(2005)

Scientific paper

10.1103/PhysRevD.72.074007

Motivated by the recent experimental data, we have revisited the $B\to \pi K,\pi \pi$ decays in the framework of QCD factorization, with inclusion of the important strong penguin corrections of order $\alpha_s^2$ induced by $b\to D g^\ast g^\ast$ ($D=d$ or $s$ and $g^\ast$ denotes an off-shell gluon) transitions. We find that these higher order strong penguin contributions can provide $\sim 30%$ enhancement to the penguin-dominated $B\to \pi K$ decay rates, and such an enhancement can improve the consistency between the theoretical predictions and the experimental data significantly, while for the tree-dominated $B\to \pi\pi$ decays, these higher order contributions play only a minor role. When these strong penguin contributions are summed, only a small strong phase remains and the direct CP asymmetries get small corrections. We also find patterns of the ratios between the CP-averaged branching fractions remain nearly unaffected even after including these higher order corrections and the $\pi K$ puzzle still persists. Our results may indicate that to resolve the puzzle one would have to resort to new physics contributions in the electroweak penguin sector as found by Buras {\it et al}.

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