论文标题
领先的费米子三环校正到Electroweak Precision可观测值
Leading fermionic three-loop corrections to electroweak precision observables
论文作者
论文摘要
CEPC和FCC-EE等未来的电子位置山脉，具有显着提高W和Z-boson块和耦合的实验精度的能力。这将使在多TEV量表下的标准模型以外的物理学进行间接探针。为此，必须对实验测量值进行补充，以同样精确的计算，以计算标准模型中这些数量的理论预测，包括三环校正校正。本文报告了这些校正子集的计算，这些校正是由三个闭合费米子回路的图表到以下数量的：从费米常数中预测了w-boson质量，有效的弱混合角以及Z boson的部分和总宽度。这些校正的数值大小相对较小，但与未来山脉的精确目标相比，不可忽略不可忽略。顺便说一句，在先前的结果中确定了两个环校正为z宽度的错误，具有小但非零的数值影响。
Future electron-position colliders, such as CEPC and FCC-ee, have the capability to dramatically improve the experimental precision for W and Z-boson masses and couplings. This would enable indirect probes of physics beyond the Standard Model at multi-TeV scales. For this purpose, one must complement the experimental measurements with equally precise calculations for the theoretical predictions of these quantities within the Standard Model, including three-loop electroweak corrections. This article reports on the calculation of a subset of these corrections, stemming from diagrams with three closed fermion loops to the following quantities: the prediction of the W-boson mass from the Fermi constant, the effective weak mixing angle, and partial and total widths of the Z boson. The numerical size of these corrections is relatively modest, but non-negligible compared to the precision targets of future colliders. In passing, an error is identified in previous results for the two-loop corrections to the Z width, with a small yet non-zero numerical impact.
