论文标题
改进$ t \ bar {t} $重建在未来的Lepton Colliders的Dilepton频道中
Improving $t \bar{t}$ reconstruction in the dilepton channel at future lepton colliders
论文作者
论文摘要
未来的Lepton Collider，例如拟议的CLIC或ILC，将允许以前所未有的精度研究顶级夸克特性。在本文中，我们提出了一种重建$ t \ bar {t} $衰减在Dilepton频道中的$ e^+e^ - $ colliders的方法。我们为中微子四摩梅塔提供了一个简单的，封闭的分析表达，这是$ w $ boson质量的函数，并开发了一个最大化过程，以找到重建完整$ t \ bar {t} $事件的最佳解决方案。我们表明，我们的方法能够重建中微子四摩梅塔，其错误小于$ 2 \，\％$ in $ 60 \，\％$。最后，我们在计算$ w $ boson的螺旋分数中测试了这种重建方法的性能。这些可观察物的精确度量可用于探测$ WTB $顶点的新物理效果。我们发现，从大型$ t \ bar {t} $样本中，我们的重建方法允许以优于$ 1 \，\％$的精度计算这些可观察到的物品。
A future lepton collider, such as the proposed CLIC or ILC, would allow to study top quark properties with unprecedented precision. In this paper, we present a method to reconstruct the $t \bar{t}$ decay in the dilepton channel at future $e^+e^-$ colliders. We derive a simple, closed analytical expression for the neutrino four-momenta as a function of the $W$ boson mass and develop a maximization procedure to find the optimal solution for the reconstruction of the full $t \bar{t}$ event. We show that our method is able to reconstruct neutrino four-momenta with an error of less than $2 \, \%$ in $60 \, \%$ of the times. Finally, we test the performance of this reconstruction method in the calculation of the helicity fractions of the $W$ boson. A precise measurement of these observables could be used to probe new physics effects in the $Wtb$ vertex. We find that, from a large $t \bar{t}$ sample, our reconstruction method allows to calculate these observables with an accuracy better than $1 \, \%$.
