Penguin enhancement and B-->Kπ decays in perturbative QCD

By Y. Keum, Hsiang-nan Li, A. Sanda. 2000

345 citations recorded by the source corpus.

We compute branching ratios of B → Kπ decays in the framework of perturbative QCD factorization theorem. Decay amplitudes are classified into the topologies of tree, penguin and annihilation, all of which contain both factorizable and nonfactorizable contributions. These contributions are expressed as the convolutions of hard b quark decay amplitudes with universal meson wave functions. It is shown that (1) matrix elements of penguin operators are dynamically enhanced compared to those employed in the factorization assumption; (2) annihilation diagrams are not negligible, contrary to common belief; (3) annihilation diagrams contribute large strong phases; (4) the uncertainty of current data of the ratio R = Br(B0 d → Kπ)/Br(B → K0π±) and of CP asymmetries is too large to give a constraint of φ3. Assuming φ3 = 90 o which is extracted from the best fit to the data of R, predictions for the branching ratios of the four B → Kπ modes are consistent with data.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/5c709c67128805a2e415b060a37e1826aaedff9e

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In Nuclear and High Energy Physics

1. Jure Zupan
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Citations in the corpus

• Physics at Super B Factory (2004, methodology): “However the groups use different heavy quark discretizations: Fermilab/MILC use Fermilab quarks and HPQCD use non-relativistic heavy quarks (NRQCD).”