论文标题
在$ \ Mathcal {o}（α_ {\ rm s}^2）$的QCD thressverse-momentum重新召集QCD thressvers-momentum重新召集的方位角相关的贡献
Azimuthally-correlated contributions to QCD transverse-momentum resummation at $\mathcal{O}(α_{\rm S}^2)$
论文作者
论文摘要
奇异因素源自QCD在软和计算高级别散落横截面的高阶扰动贡献中，在软和计算高阶扰动贡献中，散射幅度的QCD分解幅度均具有重要作用。在本次演讲中，我们从共线极限中散射幅度的分解结构开始，并引入了具有与过程无关结构的共线函数。然后可以在适当的可观察到的相位空间上集成这些在完全差异级别上定义的共线函数，以计算对相应的可观察的对数增强的贡献。对于横向巨型依赖性可观察物，我们显示了如何在不引入文献中被称为快速差异的情况下定义共线函数。我们介绍了QCD扰动理论中的共线功能的明确计算的结果。
Singular factors originating from the QCD factorisation of scattering amplitudes in soft and collinear limits play a prominent role in both organising and computing high-order perturbative contributions to hard-scattering cross sections. In this talk, we start from the factorisation structure of scattering amplitudes in the collinear limit, and we introduce collinear functions that have a process-independent structure. These collinear functions, which are defined at the fully-differential level, can then be integrated over the appropriate observable-dependent phase space to compute logarithmically-enhanced contributions to the corresponding observable. For transverse-momentum dependent observables, we show how the collinear functions can be defined without introducing what is known as rapidity divergences in the literature. We present the results of explicit computations of the collinear functions up to next-to-next-to-leading order in the QCD perturbation theory.
