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arXiv 2409.03388hep-phhep-ex
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极化与非极化 $\mathcal{R}_{K^*}$ 在标准模型内及之外

Polarized and un-polarized $\mathcal{R}_{K^*}$ in and beyond the SM

National Center for Physics（国家物理中心）；Theoretical Physics Department, CERN（欧洲核子研究中心理论物理部）；Department of Physics, International Islamic University（国际伊斯兰大学物理系）；Department of Physics, Quaid-i-Azam University（奎德·阿扎姆大学物理系）；School of Natural Sciences, Department of Physics, National University of Sciences and Technology（国立科学技术大学理学院物理系）

Ishtiaq Ahmed, Saba Shafaq, M. Jamil Aslam, Saadi Ishaq

备注：
18 pages, 7 figures, Tables II and III updated and subsequent changes were incorporated in related Tables and Figures
发表信息：
Prog. Theor. Exp. Phys. 2025 093B09
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AI总结：

研究极化与非极化 $\mathcal{R}_{K^*}$ 在标准模型内外的作用，通过计算轻子味宇称性比率来区分新物理模型。

摘要：

标准模型（SM）是轻子味宇称统一的，最近对 $B \to (K,K^*)\ell^{+}\ell^{-}$ 衰变中轻子味宇称性的测量，对于 $\ell = μ, \; e$ 的衰变，现在接近 SM 预测。然而，这在 $τ$ 到 $μ$ 比例中并不成立，其中仍有一些窗口可供新物理（NP）利用，为容纳这些比例，各种 SM 扩展被提出。会很有趣的是识别一些可观测变量，这些变量不仅对 NP 模型的参数空间敏感，而且具有一定的区分能力。我们发现 $K^{*}$ 的极化可能起重要作用，因此，我们计算了 $B\to K^{*}\ell^{+}\ell^{+}$ 衰变中 $τ$ 到 $μ$ 的非极化和极化轻子味宇称性比率，$\ell= μ, τ$ 的衰变。计算显示，在大多数情况下，各种提出的可观测变量的值落在当前实验灵敏度范围内，其在一些正在进行和未来实验中的研究将作为区分 NP 模型变体的工具。

英文摘要：

The Standard Model (SM) is lepton flavor universal, and the recent measurements of lepton flavor universality in $B \to (K,K^*)\ell^{+}\ell^{-}$, for $\ell = μ, \; e$, decays now lie close to the SM predictions. However, this is not the case for the $τ$ to $μ$ ratios in these decays, where there is still some window open for the new physics (NP), and to accommodate them various extensions to the SM are proposed. It will be interesting to identify some observables which are not only sensitive on the parametric space of such NP models but also have some discriminatory power. We find that the polarization of the $K^{*}$ may play an important role, therefore, we have computed the unpolarized and polarized lepton flavor universality ratios of $τ$ to $μ$ in $B\to K^{*}\ell^{+}\ell^{+}$, $\ell= μ, τ$ decays. The calculation shows that in most of the cases, the values of the various proposed observables fall within the current experimental sensitivity, and their study at some on going and future experiments will serve as a tool to segregate the variants of the NP models.

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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