Studying the properties of ttbar events containing extra boson with the ATLAS experiment at the Large Hadron Collider

这个学生的研究重点是测量顶夸克的性质，比如自旋相关，在最近观察到的顶对（tt）状态中，有一个额外的Z、光子或希格斯玻色子，以探测这些玻色子和顶夸克之间的耦合。理解希格斯玻色子和顶部之间的相互作用对于我们理解质量是如何产生的至关重要，探测顶夸克和Z/光子之间的相互作用使我们能够探测量子色动力学（QCD）和电弱（EW）物理在自然界最高尺度上的相互作用。最初，重点将放在使用ATLAS探测器收集的完整Run2数据集测量ttZ和ttGamma事件中的自旋相关性上。未来的工作将准备在Run3和ttH事件期间进行类似的测量，届时统计数据将更加有利。所有这些测量都将成为寻找或在没有信号约束的情况下，超越标准模型（BSM）物理的有力工具。

This studentship focuses on measuring top quark properties, such as spin correlation, in recently-observed top pair (tt) states with either an additional Z, photon, or Higgs boson, in order to probe the couplings between these bosons and the top quark. Understanding the interaction between the Higgs boson and the top is of crucial importance for our understanding of how mass is generated and probing the interactions between the top quark and the Z/photon allows us to probe the interplay between Quantum Chromo Dynamics (QCD) and Electro Weak (EW) physics at nature's highest scales. Initially, the focus will be on measuring spin correlation in ttZ and ttGamma events using the full Run2 dataset collected by the ATLAS detector. Future work will then prepare to make similar measurements during Run3 in ttH events, where statistics will be more favourable. All of these measurements will be powerful tools for searching for, or in the absence of signal constraining, physics Beyond Standard Model (BSM).