AI 中文总结
研究通过电弱精确数据检验标准模型量子结构，利用最新实验输入和理论计算更新Gfitter分析，得出精确可观测量间接测定值，扩展到希格斯区确定其总宽度及分支比界限，并给出威尔逊系数界限和FCC - ee电弱拟合精度预测。
AI 中文摘要
全球电弱拟合通过将精确测量与高阶理论预测相对比来检验标准模型的量子结构。本文利用最新实验输入（特别是W玻色子质量的新世界平均值）和最先进的理论计算进行了更新的Gfitter分析。拟合得出了包括W和希格斯玻色子质量、顶夸克质量以及有效轻子弱混合角等精确可观测量的间接测定值，证实了标准模型显著的内部一致性。分析还通过在κ框架中将ATLAS和CMS信号强度测量与电弱精确数据相结合扩展到希格斯区。由此对希格斯与矢量玻色子耦合的电弱约束使得在领先对数斜交解释内能够以约10%或更好的精度确定希格斯玻色子总宽度，并在不使用直接搜索不可见希格斯衰变的情况下给出不可见和未检测到的希格斯玻色子分支比的界限。本文还给出了标准模型有效场论中威尔逊系数的界限以及在FCC - ee可实现的全球电弱拟合精度的预测。
英文摘要
The global electroweak fit tests the quantum structure of the Standard Model by confronting precision measurements with high-order theoretical predictions. This paper presents an updated Gfitter analysis using the latest experimental inputs, notably the new world average of the $W$-boson mass, and state-of-the-art theoretical calculations. The fit yields indirect determinations of precision observables, including the $W$ and Higgs-boson masses, the top-quark mass, and the effective leptonic weak mixing angle, confirming the remarkable internal consistency of the Standard Model. The analysis is further extended to the Higgs sector by combining ATLAS and CMS signal-strength measurements with electroweak precision data in the $κ$ framework. The resulting electroweak constraints on the Higgs couplings to vector bosons allow a determination of the total Higgs-boson width with a precision of about 10\% or better within a leading-logarithmic oblique interpretation, and provide bounds on invisible and undetected Higgs-boson branching fractions without using direct searches for invisible Higgs decays. The paper also presents bounds on Wilson coefficients in the Standard Model Effective Field Theory together with projections for the precision of the global electroweak fit achievable at the FCC-ee.
Comments32 pages, 14 figures
