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）的紫外线（UV）范围。在LHC计划的现阶段，公平地说，除非新的光，超越标准模型（BSM）物理隐藏在实验上具有挑战性的签名，它要么是弱耦合到SM或SM和BSM光谱之间有相当大的质量差距。后一种途径最近激发了基于有效场论（EFT）技术的模型无关方法。如果SM的UV完成是弱耦合和尺度分离的，以至于低能SM拉格朗日的修改在预期的理论和实验限制下变得不可分辨，EFT方法将变得像EFT试图近似的完整模型背景下的测量一样具有挑战性。另一方面，如果新物理在更大的尺度上实际上是强耦合的，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。这种理论的主要例子是具有强电弱对称性破缺的模型，这是解决层次问题的理论上有吸引力的途径。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，并将其置于SM扩展中，以预测希格斯和顶夸克扇区的修改。该项目将涵盖微扰和非微扰扩展，并将提供新的精确的见解希格斯和顶夸克测量的相关性，目前和未来的对撞机实验密切关系到天体物理学和宇宙学的互补约束。

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.