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arXiv · 2204.03796

Electroweak Precision Fit and New Physics in light of $W$ Boson Mass

Chih-Ting Lu·Lei Wu·Yongcheng Wu·Bin Zhu
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Abstract

The $W$ boson mass is one of the most important electroweak precision observables for testing the Standard Model or its extensions. The very recent measured $W$ boson mass at CDF shows about $7\sigma$ deviations from the SM prediction, which may challenge the internal consistency of the SM. By performing the global electroweak fit with the new $W$-boson, we present the new values of the oblique parameters: $S = 0.06 \pm 0.10$, $T= 0.11 \pm 0.12$, $U=0.13 \pm 0.09$, or $S=0.14 \pm 0.08$, $T= 0.26 \pm 0.06$ with $U =0$ and the corresponding correlation matrices, which strongly indicates the need for the non-degenerate multiplets beyond the SM. As a proof-of-concept, we show that the new results can be accommodated in the two-Higgs doublet model, where the charged Higgs boson has to be either heavier or lighter than both two heavy neutral Higgs bosons. Therefore, searching for these non-SM Higgs bosons will provide a complementary way to test the new physics for the $W$ boson mass anomaly.

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Chih-Ting Lu, Lei Wu, Yongcheng Wu, Bin Zhu. 2022-04-08. Electroweak Precision Fit and New Physics in light of $W$ Boson Mass. https://doi.org/10.1103/physrevd.106.035034

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