通过B_s^0 -> J/psi K_S中的CP破坏提取Gamma和Penguin拓扑
Extracting gamma and Penguin Topologies through CP Violation in B_s^0 -> J/psi K_S
摘要：
CDF合作组最近观测到了B_s^0 -> J/psi K_S衰变，这将是LHCb实验的重要内容。这个通道将提供一个新的工具来提取么正三角形的角γ，并在强相互作用的U自旋对称性的帮助下，控制双Cabibbo抑制的企鹅修正，以确定来自著名的B_d^0 -> J/psi K_S模式的sin（2 β）。虽然任何有竞争力的伽玛测定都是有趣的，但后一方面特别相关，因为LHCb将进入一个精确的领域，这使得必须控制双重Cabibbo抑制的标准模型校正。利用CDF和e^+e^- B工厂的数据作为指导，我们探讨了伽玛和企鹅参数的敏感性，指出B_s^0- \bar B_s^0混合相phi_s是这些分析的关键参数，它在标准模型中只有大约-2度，但可能通过新的物理学得到增强。我们发现混合诱导的CP破坏S（B_s^0 -> J/psi K_S）与sin（phi_s）有一个有趣的相关性，sin（phi_s）是LHCb上首次测量这个可观测值的目标区域。
英文摘要：
The B_s^0 -> J/psi K_S decay has recently been observed by the CDF collaboration and will be of interest for the LHCb experiment. This channel will offer a new tool to extract the angle gamma of the unitarity triangle and to control doubly Cabibbo-suppressed penguin corrections to the determination of sin(2beta) from the well-known B_d^0 -> J/psi K_S mode with the help of the U-spin symmetry of strong interactions. While any competitive determination of gamma is interesting, the latter aspect is particularly relevant as LHCb will enter a territory of precision which makes the control of doubly Cabibbo-suppressed Standard-Model corrections mandatory. Using the data from CDF and the e^+e^- B factories as a guideline, we explore the sensitivity for gamma and the penguin parameters and point out that the B_s^0-\bar B_s^0 mixing phase phi_s, which is only about -2 deg in the Standard Model but may be enhanced through new physics, is a key parameter for these analyses. We find that the mixing-induced CP violation S(B_s^0 -> J/psi K_S) shows an interesting correlation with sin(phi_s), which serves as a target region for the first measurement of this observable at LHCb.
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