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arXiv 1406.4570hep-ph
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四夸克有效算符top对的重整化群诱导现象

Renormalization group-induced phenomena of top pairs from four-quark effective operators

Sunghoon Jung, P. Ko, Yeo Woong Yoon, Chaehyun Yu

摘要:

我们研究了四夸克算符的重整化群(RG)演化。特别是,我们专注于某些可观的情况下,\emph{first}诱导的单循环RG,而在树级缺席。从算子混合模式,我们分类所有这些RG诱导的现象和潜在的模型,可以诱导他们。然后,我们计算了完整的单圈QCD RG演化作为主要的估计的影响和解决的问题,其中RG引起的现象有最大的和可观察到的影响。答案与QCD的颜色结构有关。研究的主题包括RG诱导的顶部不对称性,极化和极化混合,以及在这个顺序出现的问题。最后,我们将RG诱导的不对称性与单圈阶QCD和QED诱导的不对称性进行了比较。最后,我们讨论了使用RG作为顶对生产的单圈效应的代理的有效性。顺便说一句,我们澄清了经常研究的顶部对可观测量之间的关系。

英文摘要:

We study the renormalization group(RG) evolution of four-quark operators that contribute to the top pair production. In particular, we focus on the cases in which certain observables are \emph{first} induced from the one-loop RG while being absent at tree-level. From the operator mixing pattern, we classify all such RG-induced phenomena and underlying models that can induce them. We then calculate the full one-loop QCD RG evolution as the leading estimator of the effects and address the question of which RG-induced phenomena have largest and observable effects. The answer is related to the color structure of QCD. The studied topics include the RG-induction of top asymmetries, polarizations and polarization mixings as well as issues arising at this order. The RG-induction of top asymmetries is further compared with the generation of asymmetries from QCD and QED at one-loop order. We finally discuss the validity of using the RG as the proxy of one-loop effects on the top pair production. As an aside, we clarify the often-studied relations between top pair observables.

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