arXiv 2301.015222023-01hep-ph

$B-L$ 模型与 CDF II 结果的启示

$B-L$ model in light of the CDF II result

Korea Institute for Advanced Study（韩国高等研究院）；Indian Institute of Science Education and Research - Bhopal（印度科学教育与研究学院博帕尔分校）

Sanjoy Mandal, Hemant Prajapati, Rahul Srivastava

备注：: 37 pages, 16 figures, typos corrected, references added. Matches with the Published version
发表信息：: J.Phys.G 52(2025) 10,105003
DOI：: 10.1088/1361-6471/ae095a

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AI总结：

本文提出CDF II的W质量反常可能源于Z质量改变，并利用U(1)_{B-L}规范扩展模型解释S、T、U参数，同时满足暗物质约束。

摘要：

近期 CDF II 合作组关于 $W$ 玻色子质量的测量结果与标准模型预言相矛盾，需要新物理来解释这一反常现象。这种新物理可能通过对 $W$ 玻色子质量的树级或圈级修正来体现。在本工作中，我们探讨了 CDF-II 结果暗示新物理并非直接改变 $W$ 玻色子质量，而是改变 $Z$ 玻色子质量的可能性。由于 $Z$ 玻色子质量作为标准模型预言 $W$ 玻色子质量的输入参数，这一 $Z$ 质量的改变最终导致了 CDF-II 测量值与标准模型预期之间的差异。我们通过标准模型最简单且被广泛研究的 $U(1)$ 规范扩展之一，即规范化的 $U(1)_{B-L}$ 扩展，来演示这一想法。我们证明了 $B-L$ 扩展模型能够解释 CDF II 结果之后 $S$、$T$ 和 $U$ 参数的修订最佳拟合值。我们研究了中性规范玻色子之间有无混合的模型参数空间。我们还回顾了暗物质约束，并证明了存在与当前 $W$ 玻色子质量、遗迹丰度和直接探测实验兼容的参数空间。

英文摘要：

Recent CDF II collaboration's result on $W$ mass measurements contradict Standard Model prediction, requiring new physics to explain this anomaly. Such new physics may manifest through tree-level or loop-level corrections to the mass of the $W$ boson. In this work, we investigate the possibility that the CDF-II result is indicative of new physics not directly changing the $W$ boson mass but rather the $Z$ boson mass. Since the $Z$ boson mass goes as an input into the Standard Model prediction for $W$ boson mass, this change in $Z$ mass ultimately leads to the discrepancy between the CDF-II measurement and the Standard Model expectation. We demonstrate this idea through one of the simplest and most studied $U(1)$ gauge extensions of the Standard Model, namely the gauged $U(1)_{B-L}$ extension. We demonstrate that $B-L$ extended models can explain the revised best-fit values for $S$, $T$, and $U$ following the CDF II results. We studied the parameter space of models with and without mixing between neutral gauge bosons. We also reviewed the dark matter constraints and demonstrated that there is parameter space that is compatible with the current $W$ boson mass, relic abundance, and direct detection experiments.

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