Glauber Gluons in Soft Collinear Effective Theory and Factorization of Drell-Yan Processes
Glauber Gluons in Soft Collinear Effective Theory and Factorization of Drell-Yan Processes
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发表时间：
2008-02
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通讯作者：
F. Liu;J. P. Ma
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作者：
F. Liu;J. P. Ma
drel - yan过程中的Glauber胶子是一种软胶子，沿初始强子方向的横向动量远大于其动量分量。它们的存在对于证明Drell-Yan过程的分解是一个严峻的挑战。最近提出的QCD软共线效应理论可以提供一种透明的方式来显示一类过程的因数分解，但它没有解决glauber胶子的影响。在这封信中，我们首先通过一个例子证实了格劳伯胶子的存在。然后，我们将青光眼胶子加入到有效理论中，并研究了它们与其他粒子的相互作用。在有格劳伯胶子的有效理论框架下，我们能够证明格劳伯胶子在drel - yan过程中的影响被取消，并且在格劳伯胶子存在的情况下，分解是成立的。本文在软共线有效理论的框架下完成了drel - yan过程的分解证明或论证。
Glauber gluons in Drell-Yan processes are soft gluons with the transverse momenta much larger than their momentum components along the directions of initial hadrons. Their existence has been a serious challenge in proving the factorization of Drell-Yan processes. The recently proposed soft collinear effect theory of QCD can provide a transparent way to show factorizations for a class of processes, but it does not address the effect of glauber gluons. In this letter we first confirm the existence of glauber gluons through an example. We then add glauber gluons into the effective theory and study their interaction with other particles. In the framework of the effective theory with glauber gluons we are able to show that the effects of glauber gluons in Drell-Yan processes are canceled and the factorization holds in the existence of glauber gluons. Our work completes the proof or argument of factorization of Drell-Yan process in the framework of the soft collinear effective theory.