TopFlav – Top-flavor couplings at the FCC-ee

目前基于对撞机的粒子物理实验通过直接搜索新粒子或间接通过与理论预测的精确测量比较来寻找超越粒子物理标准模型（SM）的物理。后者可以通过测试具体的模型来完成，例如涉及超对称、外来粒子或新力的模型，或者根据模型无关的有效场论（EFT）参数化可能的影响。除了香料领域的紧张关系外，直到今天还没有发现SM之外的物理迹象。与此同时，人们正在讨论新一代的实验，其重点是电子和正电子的精确测量。该项目的目的是根据涉及顶夸克的测量，估计这些实验之一FCC-ee对第三代风味部门的敏感性。特别是，可能的顶夸克测量将被研究，这对在EFT方法中定义的算子有重大影响。将对相应的不确定性预算进行全面估计，包括对测量之间的相关性进行估计。将在最先进的拟合工具中使用和实施适当的EFT模型，并结合FCC-ee测量的估计精度。结果是对相应的超sm算子的强度的预期约束。将可能的FCC-ee测量与风味和顶夸克部门的精确测量相结合将是该项目的最后一步，并将为讨论未来应该建立哪些实验提供关键的输入。

Current experiments in collider-based particle physics search for physics beyond the Standard Model of Particle Physics (SM) either through direct searches for new particles or indirectly via the comparison of precision measurements with theoretical predictions. The latter can be done by testing concrete models, for example models involving super symmetry, exotic particles or new forces, or by parameterizing possible effects in terms of a model-independent effective field theory (EFT). Apart from tensions in the flavor sector, no sign of physics beyond the SM has been found until today. At the same time, a new generation of experiments is being discussed that focus on precision measurements with electrons and positrons. The aim of the project is to estimate the sensitivity of one of these experiments, the FCC-ee, to the third-generation flavor sector based on measurements involving top quarks. In particular, possible top-quark measurements will be studied which have a significant impact on operators defined in the EFT approach. A full estimation of the corresponding uncertainty budget will be performed including estimates of the correlations among the measurements. Appropriate EFT models will be used and implemented in state-of-the-art fitting tools together with the estimated precision of the FCC-ee measurements. The results are expected constraints on the strengths of the corresponding beyond-SM operators. The combination of possible FCC-ee measurements with precision measurements in the flavor and top-quark sector will be the final step of the project and will give the community critical input for the discussion about which experiment should be built in the future.