TopFlav – Top-flavor couplings at the FCC-ee

• Applicant: Professor Dr. Kevin Kröninger
• Subject Area: Nuclear and Elementary Particle Physics, Quantum Mechanics, Relativity, Fields
• Term: since 2021
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 465609373

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.

• DFG Programme: Research Grants
• International Connection: France
• Cooperation Partner: Professor Dr. Stephane Monteil