$\bar{u}d \rightarrow t\bar{t}W$过程一循环QCD修正项中$\mathcal{O}(\varepsilon^2)$级贡献
高能物理 - 唯象学
2025-11-05 v2 高能物理 - 理论
摘要
我们计算了顶夸克对产生以玻色子为伴随的过程的一循环QCD修正项,包含级次项,其中为维数正则化中的展开参数。本结果为洞察该过程两循环�幅的复杂度提供了首次 glimpse,这是通向该过程达到次次级次(NNLO)QCD描述的第一步。我们进行了张量分解,并将相应的形式函数表达为具有紧凑有理系数的独立特殊函数基的线性组合,为后续工作提供了结构化框架。此外,我们推导了形式函数的显式解析表示,有效至级,以对数和二元对数(dilogarithm)表示。对于所需的完整特殊函数集合,我们获得一种基于广义幂级数展开的半数值解法。
引用
@article{arxiv.2502.14952,
title = {One-Loop QCD Corrections to $\bar{u}d \rightarrow t\bar{t}W$ at $\mathcal{O}(\varepsilon^2)$},
author = {Matteo Becchetti and Maximilian Delto and Sara Ditsch and Philipp Alexander Kreer and Mattia Pozzoli and Lorenzo Tancredi},
journal= {arXiv preprint arXiv:2502.14952},
year = {2025}
}
备注
37 pages, 1 figure, 2 tables. The paper is complemented by a Zenodo repository found at https://zenodo.org/records/14810498. v2 is published in JHEP. Added paragraphs on pages 3, 24 and 27 to stress which points of the computation will be useful for the two-loop amplitude. Corrected minor typos and added citation to the two-loop integrals paper