Singlet extensions and W boson mass in light of the CDF II result
Singlet extensions and W boson mass in light of the CDF II result
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DOI：
10.1016/j.physletb.2022.137324
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发表时间：
2022-04
影响因子：
4.4
通讯作者：
K. Sakurai;F. Takahashi;W. Yin
中科院分区：
文献类型：
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作者：
K. Sakurai;F. Takahashi;W. Yin
最近，CDF合作组报告了W玻色子质量的精确测量，MW = 80433.5±9.4 MeV，基于费米实验室Tevatron的CDF II探测器的8.8 fb− 1 s= 1.96 TeV p p <$碰撞数据。这与标准模型的预测值MWSM = 80357±6 MeV相差约7σ。如此大的差异可能部分是由于外来粒子辐射改变了W和Z玻色子质量之间的关系。在这封信中，我们研究了标准模型的单重态扩展，重点是W玻色子质量的转移，因为它们是偶然的味道和CP安全的，而不改变标准模型的结构。在真实的单重态场的最小延拓中，利用从电弱斜参数、B介子衰变、LEP和LHC得到的边界，我们发现W玻色子的质量移动最多只有几MeV，因此它并没有缓解CDF II结果和SM预测之间的紧张关系。然后，我们研究了有多少不同的界限放松时，单重态被允许无形地衰减，并发现W玻色子质量的增加不超过5兆电子伏，由于从希格斯信号强度的约束。我们还讨论了单重态扩展的现象学和宇宙学意义，如μ子g− 2异常，轴子/隐藏光子暗物质和自相互作用暗辐射作为可能缓解哈勃张力。
Recently, the CDF collaboration has reported the precise measurement of the W boson mass, M W= 80433.5±9.4 MeV, based on 8.8 fb− 1 of s= 1.96 TeV p p¯ collision data from the CDF II detector at the Fermilab Tevatron. This is about 7σ away from the Standard Model prediction, M W SM= 80357±6 MeV. Such a large discrepancy may be partially due to exotic particles that radiatively alter the relation between the W and Z boson masses. In this Letter, we study singlet extensions of the Standard Model focusing on the shift of the W boson mass since they are accidentally flavor and CP safe without changing the Standard Model structure. In the minimal extension with a real singlet field, using the bounds from the electroweak oblique parameters, B meson decays, LEP, and LHC, we find that the W boson mass shift is at most a few MeV, and therefore it does not alleviate the tension between the CDF II result and the SM prediction. We then examine how much various bounds are relaxed when the singlet is allowed to decay invisibly, and find that the increase of the W boson mass does not exceed 5 MeV due to the bound from the Higgs signal strength. We also discuss phenomenological and cosmological implications of the singlet extensions such as the muon g− 2 anomaly, axion/hidden photon dark matter, and self-interacting dark radiation as a possible alleviation of the Hubble tension.