论文标题
排除$ b \ $ b \ to s \ ell^+\ ell^ - $的轻度$ z^\ prime $ uxplanation
Towards excluding a light $Z^\prime$ explanation of $b\to s\ell^+\ell^-$
论文作者
论文摘要
$ b \ to s \ ell^+\ ell^ - $数据与相应的标准模型预测之间的差异构成了当前可用的新物理学（在TEV量表或以下）中最重要的提示。实际上，文献中已经提出了许多可以解释这些异常情况的情况。但是，只有单一的新物理学解释，即质量低于$ b $梅森量表：一个轻的$ z^\ prime $ boson。在本文中，我们指出的是，$ b \ to K^{（*）}νν$的限制有限，包括正确处理必不可少的$ z^\ prime $宽度所需的实验敏感性，以及即将到来的Belle〜II分析的$ e^+e^+e^+e^ - \ to g tous^ - \ to的$^+μ^ - $ z $ suble $ z $ suble py， $ b \ to s \ ell^+\ ell^ - $数据的说明，质量低于$ \ oft4 \，$ gev。重要的是，这样的轻$ z^\ prime $是$ b \ to s \ ell^+\ ell^ - $异常的唯一可行的单个粒子解决方案，预测$ r（k^{（*）}）> 0 $ in High $ q^2 $ bins，因此提供了一个基本的数据测试。
The discrepancies between $b\to s\ell^+\ell^-$ data and the corresponding Standard Model predictions constitute the most significant hints for new physics (at the TeV scale or below) currently available. In fact, many scenarios that can account for these anomalies have been proposed in the literature. However, only a single light new physics explanation, i.e. with a mass below the $B$ meson scale, is possible: a light $Z^\prime$ boson. In this article, we point out that improved limits on $B\to K^{(*)}νν$, including the experimental sensitivities required for a proper treatment of the necessarily sizable $Z^\prime$ width, together with the forthcoming Belle~II analyses of $e^+e^-\toμ^+μ^-+{\rm invisible}$, can rule out a $Z^\prime$ explanation of $b\to s\ell^+\ell^-$ data with a mass below $\approx4\,$GeV. Importantly, such a light $Z^\prime$ is the only viable single particle solution to the $b\to s\ell^+\ell^-$ anomalies predicting $R(K^{(*)})>0$ in high $q^2$ bins, therefore providing an essential consistency test of data.
