Top and Higgs physics in the precision LHC era

大型强子对撞机(LHC)的测量已经探索并限制了粒子物理标准模型(SM)的一系列紫外线(UV)完成。在大型强子对撞机计划的现阶段，公平地说，除非超越标准模型(BSM)物理的新光隐藏在实验上具有挑战性的信号中，否则它要么与标准模型弱耦合，要么在标准模型和BSM光谱之间存在相当大的质量差距。后者在很大程度上推动了基于有效场论(EFT)技术的与模型无关的方法。如果SM的UV完成既是弱耦合的，又是尺度分离的，以至于根据预期的理论和实验限制，对低能SM拉格朗日的修改变得不可分辨，EFT方法将变得与EFT试图近似的全模型环境中的测量一样具有挑战性。另一方面，如果新的物理实际上在更大的尺度上是强耦合的，那么基于EFT的方法是捕捉UV完成的动力学和对称性的合适工具。这类理论的主要例子是具有强电弱对称破缺的模型，这在理论上是解决层级问题的一个有吸引力的途径。该项目旨在开发先进的分析策略(包括机器学习)，以增强和利用预期的LHC EFT约束的敏感性，并将它们与预测希格斯和顶级夸克扇区修改的SM扩展联系起来。该项目将涵盖微扰和非微扰扩展，并将为目前和未来的对撞机实验中与天体物理学和宇宙学的互补约束密切相关的希格斯和顶夸克测量的相关性提供新的精确见解。

Measurements at the Large Hadron Collider (LHC) have explored and constrained a range of ultraviolet (UV) completions of the Standard Model (SM) of Particle Physics. At the present stage of the LHC programme it is fair to say that unless new light, beyond the Standard Model (BSM) physics is hiding in experimentally challenging signatures, it is either weakly coupled to the SM or there is a considerable mass gap between the SM and the BSM spectra. The latter avenue has motivated largely model-independent approaches based on effective field theory (EFT) techniques recently. In case the SM's UV completion is both weakly coupled and scale separated to the extent that modifications of the low-energy SM lagrangian become non-resolvable in the light of expected theoretical and experimental limitations, the EFT approach will become as challenged as measurements in the full model context that the EFT tries to approximate. If, on the other hand, new physics is actually strongly coupled at larger scales, EFT-based methods are suitable tools in capturing the UV completions' dynamics and symmetry. Prime examples of such theories are models with strong electroweak symmetry breaking, which a theoretically attractive avenues to address the Hierarchy problem. This project aims at the development of advanced analysis strategies (including machine learning) to enhance and exploit the sensitivity of expected LHC EFT constraints and contextualise them in SM extensions that predict modifications of the Higgs and top quark sectors. The project will cover perturbative and non-perturbative extensions and will provide new precision insights into the relevance of Higgs and top quark measurements at present and future collider experiments in close relation to complementary constraints from astrophysics and cosmology.