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arXiv 1806.02791hep-ph
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强子和新物理对$b \to s$跃迁的贡献

Hadronic and New Physics Contributions to $b \to s$ Transitions

A. Arbey, T. Hurth, F. Mahmoudi, S. Neshatpour

摘要:

假设最近在$b \to s$数据中观察到的异常的来源是新物理,那么就没有先验的理由相信--用有效场论的语言来说--只有一种类型的算符对张力负责。因此,我们第一次执行一个全球性的拟合,其中所有的威尔逊系数,可以有效地接收新的物理贡献被认为是,允许轻子味普适性破坏的影响,以及手征翻转和标量和赝标量运营商的贡献,并找到SM拉考虑到所有有效的参数。作为对所有可用$b \to s$数据(包括所有相关Wilson系数)进行完全拟合的结果,我们获得了总拉力为4.1 $σ$,SM假设功效校正的误差为10%。此外,我们做了统计比较,发现是否最有利的解释的异常是新的物理或低估强子效应使用最一般的参数化,这是完全符合的振幅的解析结构。这个Wilks检验将是分析即将到来的$B\to K^* μ^+ μ^-$数据的一个非常有用的工具。由于在$B \to K^* μ^+μ^-$中观测到的角向可观测量中的张力的意义目前依赖于强子对这些衰变的贡献的理论估计,我们简要地讨论了考虑长距离强子效应的各种可用方法,并研究了这些贡献的不同估计如何导致观测到的异常的新物理解释的独特意义。

英文摘要:

Assuming the source of the anomalies observed recently in $b \to s$ data to be new physics, there is a priori no reason to believe that - in the effective field theory language - only one type of operator is responsible for the tensions. We thus perform for the first time a global fit where all the Wilson coefficients which can effectively receive new physics contributions are considered, allowing for lepton flavour universality breaking effects as well as contributions from chirality flipped and scalar and pseudoscalar operators, and find the SM pull taking into account all effective parameters. As a result of the full fit to all available $b \to s$ data including all relevant Wilson coefficients, we obtain a total pull of 4.1$σ$ with the SM hypothesis assuming 10% error for the power corrections. Moreover, we make a statistical comparison to find whether the most favoured explanation of the anomalies is new physics or underestimated hadronic effects using the most general parameterisation which is fully consistent with the analyticity structure of the amplitudes. This Wilks' test will be a very useful tool to analyse the forthcoming $B\to K^* μ^+ μ^-$ data. Because the significance of the observed tensions in the angular observables in $B \to K^* μ^+μ^-$ is presently dependent on the theory estimation of the hadronic contributions to these decays, we briefly discuss the various available approaches for taking into account the long-distance hadronic effects and examine how the different estimations of these contributions result in distinct significance of the new physics interpretation of the observed anomalies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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