Perturbative QCD analysis of B→φK* decays

Perturbative QCD analysis of B→φK* decays
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DOI:
10.1103/physrevd.66.054013
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发表时间:
2002-04
期刊:
影响因子:
5
通讯作者:
C. Chen;Y. Keum;Hsiang-nan Li
C. Chen;Y. Keum;Hsiang-nan Li
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
C. Chen;Y. Keum;Hsiang-nan Li

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在微扰QCD形式下,我们研究了第一个观测到的无粲$B\to VV$模,即$B\to\phi K^*$衰变.由QCD分解得到的分支比$B(B\to\phi K^*)\sim 15 \times 10^{-6}$大于$\sim 9\times 10^{-6}$。将不同螺旋度振幅和分支比的预测值和相位与实验数据进行比较,可以分别检验微扰QCD中的功率计数规则、湮灭贡献的评估以及动力学企鹅增强机制。
We study the first observed charmless $B\to VV$ modes, the $B\to\phi K^*$ decays, in perturbative QCD formalism. The obtained branching ratios $B(B\to\phi K^*)\sim 15 \times 10^{-6}$ are larger than $\sim 9\times 10^{-6}$ from QCD factorization. The comparison of the predicted magnitudes and phases of the different helicity amplitudes, and branching ratios with experimental data can test the power counting rules, the evaluation of annihilation contributions, and the mechanism of dynamical penguin enhancement in perturbative QCD, respectively.