The discrepancies between the measurements of rare (semi)leptonic $B$ decays and the corresponding Standard Model predictions point convincingly toward the existence of new physics for which a heavy neutral gauge boson ($Z^{\prime }$) is a prime candidate. However, the effect of the mixing of the $Z^{\prime }$ with the SM $Z$, even though it cannot be avoided by any symmetry, is usually assumed to be small and thus neglected in phenomenological analyses. In this paper we point out that a mixing of the naturally expected size leads to lepton flavor universal contributions, providing a very good fit to $B$ data. Furthermore, the global electroweak fit is affected by $Z-Z^{\prime }$ mixing where the tension in the $W$ mass, recently confirmed and strengthened by the CDF measurement, prefers a nonzero value of it. We find that a $Z^{\prime }$ boson with a mass between $\approx 1–5\mathrm{TeV}$ can provide a unified explanations of the $B$ anomalies and the $W$ mass. This strongly suggest that the breaking of the new gauge symmetry giving raise to the $Z^{\prime }$ boson is linked to electroweak symmetry breaking with intriguing consequences for model building.

中文翻译：

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半轻衰变与Wmass异常的统一解释

稀有（半）轻子的测量值之间的差异$乙$衰变和相应的标准模型预测令人信服地指向新物理的存在，其中重中性规范玻色子（$Z^{\text{'}}$) 是主要候选人。但是，混合的效果$Z^{\text{'}}$与 SM$Z$，尽管它不能通过任何对称性来避免，但通常被假定为很小，因此在现象学分析中被忽略。在本文中，我们指出，自然预期大小的混合会导致轻子风味的普遍贡献，提供非常适合$乙$数据。此外，全局电弱拟合受以下因素影响$Z-Z^{\text{'}}$混合在哪里的张力$W$最近通过 CDF 测量确认和加强的质量更喜欢它的非零值。我们发现一个$Z^{\text{'}}$质量介于两者之间的玻色子$\approx 1–5\mathrm{TeV}$可以提供统一的解释$乙$异常和$W$大量的。这强烈表明新规范对称性的破坏导致了$Z^{\text{'}}$玻色子与电弱对称性破坏有关，对模型构建具有有趣的影响。