The recent CDF-II measurement of the mass of the W boson shows a significant tension with the Standard Model (SM) expectation, even when averaged with earlier measurements. The tension can be explained in the framework of any beyond-SM dynamics that contributes substantially to the oblique S and T parameters. As a typical example of such beyond-SM physics, we try to explain the tension in the framework of the Georgi-Machacek model that keeps $\rho =1$ at the tree-level, and explore the parameter space that can accommodate the W mass shift. We find that a sizeable split between the custodial triplet and 5-plet of scalars can help alleviate the tension to a large extent, and raise the W-mass by about 30 MeV over its SM value.

最近对W玻色子质量的 CDF-II 测量显示出与标准模型 (SM) 预期的显着张力，即使是与早期测量值平均时也是如此。张力可以在任何对斜S和T参数有很大贡献的超越 SM 动力学的框架中解释。作为这种超越 SM 物理的一个典型例子，我们试图在 Georgi-Macachek 模型的框架中解释张力，它保持$\rho =1$在树级别，探索可以适应W质量偏移的参数空间。我们发现，保管三重态和 5-plet 标量之间的相当大的分裂可以在很大程度上帮助缓解紧张，并将W质量比其 SM 值提高约 30 MeV。