Charmless Bs→PP, PV, VV decays based on the six-quark effective Hamiltonian with strong phase effects II
Charmless Bs→PP, PV, VV decays based on the six-quark effective Hamiltonian with strong phase effects II
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DOI：
10.1140/epjc/s10052-012-1914-4
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发表时间：
2011-07
期刊：
影响因子：
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通讯作者：
Fang Su;Yue-Liang Wu;Yi-Bo Yang;Ci Zhuang
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文献类型：
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作者：
Fang Su;Yue-Liang Wu;Yi-Bo Yang;Ci Zhuang
我们基于QCD的近似六夸克算符有效哈密顿量，系统地研究了无粲b→PP、PV、vvdec衰变（pandv分别表示伪标量和矢量介子）。对相关硬散射核进行了计算，得到的跃迁形状因子与QCD求和规则计算结果一致。通过考虑涉及“手性增强”项的重要功率校正类别和顶点校正以及具有非平凡强相的弱湮灭贡献，我们预测了b衰变到PP， PV和VV最终态的分支比和CP不对称性，以及VV最终态中相应的极化观测值。发现在颜色抑制和企鹅主导的衰减模式下，具有非平凡强相的弱湮灭贡献对观测值有显著的影响。此外，我们还讨论了SU(3)风味对称，并表明对称关系一般是被尊重的。
We provide a systematic study of charmlessBs→PP,PV,VVdecays (PandVdenote pseudoscalar and vector mesons, respectively) based on an approximate six-quark operator effective Hamiltonian from QCD. The calculation of the relevant hard-scattering kernels is carried out, the resulting transition form factors are consistent with the results of QCD sum-rule calculations. By taking into account important classes of power corrections involving “chirally enhanced” terms and the vertex corrections as well as weak annihilation contributions with non-trivial strong phase, we present predictions for the branching ratios and CP asymmetries ofBsdecays into PP, PV and VV final states, and also for the corresponding polarization observables in VV final states. It is found that the weak annihilation contributions with non-trivial strong phase have remarkable effects on the observables in the color-suppressed and penguin-dominated decay modes. In addition, we discuss the SU(3) flavor symmetry and show that the symmetry relations are generally respected.