论文标题
根据CDF II结果，单线扩展和W玻色子质量
Singlet extensions and W boson mass in the light of the CDF II result
论文作者
论文摘要
最近，CDF合作报告了W Boson Mass的精确度量，$ m_w = 80433.5 \ pm 9.4 \，$ MEV，基于$ 8.8 $ fb $^{ - 1} $ of $ \ sqrt {s} = 1.96 = 1.96 $ p \ bar p \ bar {这是距标准模型预测的$7σ$，$ m_ {w}^{\ rm sm} = 80357 \ pm 6 \，$ mev。如此巨大的差异可能部分是由于外来颗粒辐射改变了W和Z玻色子质量之间的关系。在这封信中，我们研究了针对W玻色子质量转移的标准模型的单线扩展。在具有真实单重线场的最小延伸中，使用electroweak倾斜参数，b Meson衰变，LEP和LHC的边界，我们发现W Boson质量移位最多是几mEV，因此并不能减轻CDF II结果和SM预测之间的张力。然后，我们检查当允许单线衰减的单线时，我们会检查多少各种界限，并发现由于HIGGS信号强度的界限，W玻色子质量的增加不超过$ 5 $ MEV。我们还讨论了单线扩展的现象学和宇宙学的含义，例如Muon $ g-2 $异常，斧头/隐藏的光子暗物质以及自我相互作用的暗辐射，以减轻哈勃张力。
Recently, the CDF collaboration has reported the precise measurement of the W boson mass, $M_W = 80433.5\pm 9.4 \,$MeV, based on $8.8$ fb$^{-1}$ of $\sqrt{s}=1.96$ TeV $p\bar{p}$ collision data from the CDF II detector at the Fermilab Tevatron. This is about $7σ$ away from the Standard Model prediction, $M_{W}^{\rm SM}=80357 \pm 6 \,$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. 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.
