arXiv 1401.75872014-01hep-ph

Drell-Yan过程中的自旋关联、部分子纠缠和其他非常规QCD效应

Spin correlations in the Drell-Yan process, parton entanglement, and other unconventional QCD effects

Otto Nachtmann

备注：: 43 pages, v2: Some additional comments and references
DOI：: 10.1016/j.aop.2014.07.022

摘要：

本文回顾了1984年至1995年有关高能反应中各种非标准QCD效应讨论的动力来源--关于QCD真空结构的观点。这些影响包括，特别是，横向动量和自旋相关的Drell-Yan过程和软光子产生的强子-强子碰撞。我们讨论的关系，在上述文章中介绍的方法，后来开发的方法，使用横向动量依赖的部分子分布（TDM）。后一种方法是我们更一般的方法的一个特例，它允许高能反应中的部分子纠缠。我们讨论了Drell-Yan反应中部分子纠缠的特征。此外，在pp碰撞中通过胶子-胶子湮灭产生Higgs玻色子的两个胶子的纠缠效应进行了讨论，发现是潜在的重要。这些效应可以在当前的LHC实验中找到。在我们看来，研究高能反应中的部分子纠缠效应，一方面，本身是非常值得的，另一方面，它允许对标准因子分解假设进行定量测试。显然，在Drell-Yan反应和/或希格斯玻色子产生中部分子纠缠效应的实验观察将对我们理解QCD在高能碰撞中如何工作产生巨大影响。

英文摘要：

We review ideas on the structure of the QCD vacuum which had served as motivation for the discussion of various non-standard QCD effects in high-energy reactions in articles from 1984 to 1995. These effects include, in particular, transverse-momentum and spin correlations in the Drell-Yan process and soft photon production in hadron-hadron collisions. We discuss the relation of the approach introduced in the above-mentioned articles to the approach, developed later, using transverse-momentum-dependent parton distributions (TDMs). The latter approach is a special case of our more general one which allows for parton entanglement in high-energy reactions. We discuss signatures of parton entanglement in the Drell-Yan reaction. Also for Higgs-boson production in pp collisions via gluon-gluon annihilation effects of entanglement of the two gluons are discussed and are found to be potentially important. These effects can be looked for in the current LHC experiments. In our opinion studying parton-entanglement effects in high-energy reactions is, on the one hand, very worthwhile by itself and, on the other hand, it allows to perform quantitative tests of standard factorisation assumptions. Clearly, the experimental observation of parton-entanglement effects in the Drell-Yan reaction and/or in Higgs-boson production would have a great impact on our understanding how QCD works in high-energy collisions.

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