Perturbative QCD analysis of B ->phi K decays and power counting
Perturbative QCD analysis of B ->phi K decays and power counting
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DOI：
10.1103/physrevd.64.112002
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发表时间：
2001-07
影响因子：
5
通讯作者：
C. Chen;Y. Keum;Hsiang-nan Li
中科院分区：
文献类型：
--
作者：
C. Chen;Y. Keum;Hsiang-nan Li
在微扰QCD体系中研究了非轻子$B$介子衰变$B\到\phi K\的过程.结果表明，在考虑了k_T和阈值修正后，衰减振幅不再存在端点（对数和线性）奇异性。功率计数的发射和湮没拓扑图，包括因式分解和nonfactorizable的，讨论了Sudakov效应考虑。我们对分支比$B（B\to\phi K）\sim 10 \times 10^{-6}$的预测大于因式分解方法的预测（$\sim 4 \times 10^{-6}$），因为企鹅贡献的动力学增强。这种增强是否是必不可少的企鹅占主导地位的模式可以证明实验数据。
We investigate exclusive nonleptonic $B$ meson decays $B\to\phi K$ in perturbative QCD formalism. It is shown that the end-point (logarithmic and linear) singularities in decay amplitudes do not exist, after $k_T$ and threshold resummations are included. Power counting for emission and annihilation topologies of diagrams, including both factorizable and nonfactorizable ones, is discussed with Sudakov effects taken into account. Our predictions for the branching ratios $B(B\to\phi K)\sim 10 \times 10^{-6}$ are larger than those ($\sim 4 \times 10^{-6}$) from the factorization approach because of dynamical enhancement of penguin contributions. Whether this enhancement is essential for penguin-dominated modes can be justified by experimental data.