Bound-state effects on kinematical distributions of top quarks at hadron colliders
Bound-state effects on kinematical distributions of top quarks at hadron colliders
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DOI：
10.1007/jhep09(2010)034
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发表时间：
2010-07
影响因子：
5.4
通讯作者：
Y. Sumino;H. Yokoya
中科院分区：
文献类型：
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作者：
Y. Sumino;H. Yokoya
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，并考虑了在阈值区很重要的束缚态效应。我们包括束缚态的影响，使横截面是正确的LO近似在阈值和高能量区域。在此基础上，利用蒙特-卡罗事件生成方法计算了LHC中顶夸克及其衰变产物的各种运动学分布。这些进行了比较与相应的预测的基础上，传统的微扰QCD。特别是，我们发现了一个特征的束缚态效应的双不变质量分布，这是变形的低不变质量侧的相关方式。
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 thethreshold 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 thedouble-invariant-mass distribution, which is deformed to the lower invariant-mass side in a correlated manner.