论文标题
带有费米昂环路的两环电动校正到$ e^+ e^ - \ to zh $
Two-Loop Electroweak Corrections with Fermion Loops to $e^+ e^- \to ZH$
论文作者
论文摘要
我们介绍了临时临时到领先（NNLO）的校正的完整计算，该校正涉及$ e^+ e^ - \ to zh $过程的封闭费米循环。通过对两环顶点和框图使用半数字技术来实现这一点，该技术基于Feynman参数和分散关系，用于两个子路之一。用合适的减法术语处理紫外线差异。提供了质量中心能量$ \ sqrt {s} = 240〜 \ text {gev} $的非极化微分和集成横截面的数值结果。将NNLO贡献与一个和两个封闭的费米子回路相结合，发现它们将NLO横截面增加了0.7 \％。
We present a complete calculation of the next-to-next-to-leading (NNLO) electroweak corrections involving closed fermion loops to the $e^+ e^- \to ZH$ process. This has been achieved by using a semi-numerical technique for the two-loop vertex and box diagrams, which is based on Feynman parameters and dispersion relations for one of the two sub-loops. UV divergences are treated with suitable subtraction terms. Numerical results for the unpolarized differential and integrated cross-section at center-of-mass energy $\sqrt{s}=240~\text{GeV}$ are provided. Combining the NNLO contributions with one and two closed fermions loops, they are found to increase the NLO cross-section by 0.7\%.
