Constraints on the nonuniversal Z′ couplings from B → πK, πK* and ρK decays
Constraints on the nonuniversal Z′ couplings from B → πK, πK* and ρK decays
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DOI：
10.1088/1126-6708/2009/05/056
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发表时间：
2009-03
影响因子：
5.4
通讯作者：
Qin Chang;Xin-Qiang Li;Ya-dong Yang
中科院分区：
文献类型：
--
作者：
Qin Chang;Xin-Qiang Li;Ya-dong Yang
由于CP不对称性ACP（B− → π 0 K −）和ACP（0 → π+K−）之间的巨大差异，我们联合收割机了B → πK，πK* 和ρK衰变的最新实验信息，寻求非普适Z'模型的可能解.详细分析了不同类型的耦合的相对影响，在四个具体的情况下。在数值上，我们发现新的耦合参数，与一个共同的非平凡的新的弱相位L ~ −86°，这是相关的Z'贡献的电弱企鹅部门C9和C7，是至关重要的观察到的"πK之谜”。此外，他们被发现是绝对不平等和相反的符号。我们还发现ACP（B− → ρ 0 K −）对新的Z'耦合有很强的约束作用，这意味着Z'对QCD企鹅算符O3系数的贡献包含了所需的参数λ LL.
Motivated by the large difference between the direct CP asymmetries ACP(B− → π0K−) and ACP(0 → π+K−), we combine the up-to-date experimental information on B → πK, πK* and ρK decays to pursue possible solutions with the nonuniversal Z' model. Detailed analyses of the relative impacts of different types of couplings are presented in four specific cases. Numerically, we find that the new coupling parameters, ξLL and ξLR with a common nontrivial new weak phase L ~ −86°, which are relevant to the Z' contributions to the electroweak penguin sector C9 and C7, are crucial to the observed ``πK puzzle". Furthermore, they are found to be definitely unequal and opposite in sign. We also find that ACP(B− → ρ0K−) can put a strong constraint on the new Z' couplings, which implies the Z' contributions to the coefficient of QCD penguins operator O3 involving the parameter ζLL required.