Measurements of observables sensitive to colour reconnection in $$t{\bar{t}}$$ events with the ATLAS detector at $$\sqrt{s} =$$ 13 TeV
Measurements of observables sensitive to colour reconnection in $$t{\bar{t}}$$ events with the ATLAS detector at $$\sqrt{s} =$$ 13 TeV
复制标题
使用 ATLAS 探测器在 $$sqrt{s} =$$ 13 TeV 处测量对 $$t{ar{t}}$$ 事件中颜色重联敏感的可观测量
DOI：
10.1140/epjc/s10052-023-11479-x
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Aad G
中科院分区：
文献类型：
--
作者：
Aad G
本论文主要研究顶夸克对产生事件中对色重联效应敏感的观测量的测量。测量是使用139 $\mbox {fb\（^{-1}\）} $的13 TeV质子-质子碰撞数据收集的ATLAS探测器在大型强子对撞机。事件的选择需要正好一个孤立的电子和一个孤立的μ介子与相反的电荷和两个或三个喷流，其中正好两个喷流需要被标记。对于选定的事件，测量带电粒子多重性，带电粒子的横向动量的标量和，以及相同的标量和带电粒子多重性的箱子。这些可观的展开到稳定粒子的水平，从而纠正迁移效应，由于有限的检测器的分辨率，接受和效率的影响。粒子水平的测量进行了比较与不同的颜色重联模型在蒙特卡罗发生器。这些测量不赞成一些颜色重连模型，并提供投入，以未来优化的参数在蒙特卡洛发电机。
This thesis presents the measurement of observables sensitive to the effects of colour reconnection in top-quark pair-production events. The measurement is performed using 139$\mbox {fb\(^{-1}\)} $ of 13 TeV proton--proton collision data collected by the ATLAS detector at the Large Hadron Collider. Events are selected by requiring exactly one isolated electron and one isolated muon with opposite charge and two or three jets, where exactly two jets are required to be-tagged. For the selected events, measurements are presented for the charged-particle multiplicity, the scalar sum of the transverse momenta of the charged particles, and the same scalar sum in bins of charged-particle multiplicity. These observables are unfolded to the stable-particle level, thereby correcting for migration effects due to finite detector resolution, acceptance and efficiency effects. The particle-level measurements are compared with different colour reconnection models in Monte Carlo generators. These measurements disfavour some of the colour reconnection models and provide inputs to future optimisation of the parameters in Monte Carlo generators.