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arXiv 1007.0075hep-ph
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强子对撞机上顶夸克运动学分布的束缚态效应

Bound-state effects on kinematical distributions of top quarks at hadron colliders

Yukinari Sumino, Hiroshi Yokoya

摘要:

首先,我们提出了一个理论框架来计算强子对撞机上顶夸克的产生及其随后的衰变的全微分截面,并考虑了在t \bar{t}阈值区域中重要的束缚态效应。我们包括束缚态效应,使截面是正确的在LO近似中的阈值和高能量区。然后,基于这个框架,我们计算各种顶夸克的运动学分布,以及它们的衰变产物在LHC,通过蒙特卡罗事件生成。这些进行了比较与相应的预测的基础上,传统的微扰QCD。特别地,我们发现了(bW^+)-(\bar{b} W^-)双不变质量分布的特征束缚态效应,它以相关的方式向较低的不变质量侧变形。

英文摘要:

First we present a theoretical framework to compute the fully differential cross sections for the top-quark productions and their subsequent decays at hadron colliders, incorporating the bound-state effects which are important in the t\bar{t} threshold region. We include the bound-state effects such that the cross sections are correct in the LO approximation both in the threshold and high-energy regions. Then, based on this framework we compute various kinematical distributions of top quarks as well as of their decay products at the LHC, by means of Monte-Carlo event-generation. These are compared with the corresponding predictions based on conventional perturbative QCD. In particular, we find a characteristic bound-state effect on the (bW^+)-(\bar{b}W^-) double-invariant-mass distribution, which is deformed to the lower invariant-mass side in a correlated manner.

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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