论文标题
部分可观测时空混沌系统的无模型预测
Soft gluon-quark-antiquark emission in QCD hard scattering
论文作者
论文摘要
我们考虑QCD硬散射中软gluon（$ g $）和软夸克（$ q {\ bar q} $）的辐射。在软限制中，散射幅度具有奇异的行为，该行为被软电流分解和控制，该行为在颜色空间中具有与过程无关的结构。我们评估了在树级别的软$ gq {\ bar q} $当前的当前，以进行任意倍率散射过程。电流的不可还原相关组成部分包括严格的非阿布尔术语，并具有阿贝里亚特征。对于QED中的软光子 - lepton-antilepton发射，出现类似的阿贝尔相关性。软$ gq {\ bar q} $发射的平方电流产生颜色偶极子和硬质冰球区之间的颜色三角形相互作用。在电荷共轭下，颜色三摩尔相互作用是奇怪的，并导致电荷不对称效应。我们考虑使用两个和三个硬质党的过程的特定应用，我们讨论了相应的电荷不对称贡献的结构。我们还将QCD结果推广到QED和混合QCD $ \ times $ QED辐射校正的情况。
We consider the radiation of a soft gluon ($g$) and a soft quark-antiquark ($q{\bar q}$) pair in QCD hard scattering. In the soft limit the scattering amplitude has a singular behaviour that is factorized and controlled by a soft current, which has a process-independent structure in colour space. We evaluate the soft $gq{\bar q}$ current at the tree level for an arbitrary multiparton scattering process. The irreducible correlation component of the current includes strictly non-abelian terms and also terms with an abelian character. Analogous abelian correlations appear for soft photon-lepton-antilepton emission in QED. The squared current for soft $gq{\bar q}$ emission produces colour dipole and colour tripole interactions between the hard-scattering partons. The colour tripole interactions are odd under charge conjugation and lead to charge asymmetry effects. We consider the specific applications to processes with two and three hard partons, and we discuss the structure of the corresponding charge asymmetry contributions. We also generalize our QCD results to the cases of QED and mixed QCD$\times$QED radiative corrections.
