Operator Analysis of New Physics in Top-Quark Observables (B2b)

由于精确的预测和测量，可观测到的顶夸克是寻找新物理学微小效应的理想场所。在这个项目中，我们在有效场论的框架内对顶级可观测的新物理进行了全局分析。我们计算了大型强子对撞机过程，如顶反顶生产或电弱单顶生产，在QCD中排名第二，并对大型强子对撞机数据进行了全面拟合。然后将对虚顶夸克具有高灵敏度的风味观测值与高能观测值相结合，假设有效耦合具有特定的风味结构。我们还研究了直接或通过量子效应探测顶夸克相互作用的希格斯和电弱观测。我们的全局分析使我们能够确定新的搜索方向，并可能通过几个小偏差的相关性发现新的物理。

Top-quark observables are a promising place to search for small effects of new physics, thanks to precise predictions and measurements. In this project, we perform a global analysis of new physics in top observables in the framework of an effective field theory. We calculate LHC processes such as top-antitop production or electroweak single-top production to next-to-leading order in QCD and perform a comprehensive fit to LHC data. Flavor observables with a high sensitivity to virtual top-quarks are then combined with high-energy observables, assuming a specific flavor structure of the effective couplings. We also investigate Higgs and electroweak observables that probe top-quark interactions directly or through quantum effects. Our global analysis allows us to identify new search directions and to possibly discover new physics through correlations of several small deviations.