用bbar -> sbar Bs -> V_1 V_2企鹅衰变寻找新物理
Searching for New Physics with bbar -> sbar Bs -> V_1 V_2 Penguin Decays
摘要：
本文给出了Bs -> V_1（-> P_1P '_1）V_2（-> P_2P'_2）（V_i是矢量介子，P_i，P '_i是赝标量）的最一般（六螺旋度）角分析。我们专注于Bs和Bsbar都能达到的最终态--这些主要是bbar -> sbar企鹅衰变。我们还导出了最一般的衰变振幅，并讨论了它与LHCb在分析Bs -> phi phi时所用的振幅之间的差异。在标准模型中，所有的CP破坏都被预测为很小，因此对相当大的CP破坏观测量的简单测量表明新物理的存在。不需要完全拟合数据。通过确定哪些CP破坏的观测值是非零的，我们可以了解底层NP的结构。最后，我们对Bs -> K^{*0} Kbar^{*0}应用角度分析，并表明在未标记的数据样本中仍然存在许多CP破坏的可观测量。
英文摘要：
We present the most general (six-helicity) angular analysis of Bs -> V_1 (-> P_1P'_1) V_2 (-> P_2P'_2) (V_i is a vector meson, and P_i, P'_i are pseudoscalars). We focus on final states accessible to both Bs and Bsbar -- these are mainly bbar -> sbar penguin decays. We also derive the most general decay amplitude, and discuss the differences between it and that used by LHCb in its analysis of Bs -> phi phi. In the standard model, all CP violation is predicted to be small, so that the simple measurement of a sizeable CP-violating observable indicates the presence of new physics. A full fit to the data is not necessary. By determining which of the CP-violating observables are nonzero, one can learn about the structure of the underlying NP. Finally, we apply the angular analysis to Bs -> K^{*0} Kbar^{*0}, and show that there are numerous CP-violating observables that remain in the untagged data sample.
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