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arXiv 2210.09397hep-ph
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QCD硬散射中的胶子-夸克-反夸克软辐射

Soft gluon-quark-antiquark emission in QCD hard scattering

Stefano Catani, Leandro Cieri, Dimitri Colferai, Francesco Coradeschi

摘要:

本文研究了软胶子($g$)和软夸克-反夸克($q{\bar q}$)对在QCD硬散射中的辐射。在软极限中,散射振幅具有奇异行为,该奇异行为由软电流因子分解和控制,该软电流在颜色空间中具有与过程无关的结构。我们在树的水平上评估了任意多部分子散射过程的软$gq{\bar q}$电流。电流的不可约相关分量包括严格非阿贝尔项和具有阿贝尔特征的项。在QED中,软光子-轻子-反轻子辐射也存在类似的阿贝尔关联。软$gq{\bar q}$发射的平方电流在硬散射部分子之间产生色偶极和色三极相互作用。在电荷共轭作用下,色三极相互作用是奇的,并导致电荷不对称效应。我们认为,具体的应用程序与两个和三个硬部分子的过程中,我们讨论了相应的电荷不对称贡献的结构。我们还将我们的QCD结果推广到QED和混合QCD $\times$ QED辐射修正的情况。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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