Top and beauty synergies in SMEFT-fits at present and future colliders

We perform global fits within Standard Model Effective Field Theory (SMEFT) combining top-quark pair production processes and decay with b -> s flavor changing neutral current transitions and Z -> bb in three stages: using existing data from the LHC and B-factories, using projections for the HL-LHC and Belle II, and studying the additional new physics impact from a future lepton collider. The latter is ideally suited to directly probe l(+)l(-) -> tt transitions. We observe powerful synergies in combining both top and beauty observables as flat directions are removed and more operators can be probed. We find that a future lepton collider significantly enhances this interplay and qualitatively improves global SMEFT fits.

Automated summary

This study performs global fits within Standard Model Effective Field Theory (SMEFT) by combining top-quark pair production processes and decay, b -> s flavor changing neutral current transitions, and Z -> bb processes. The research is divided into three stages, with the latter stage focusing on the impact of a future lepton collider on directly probing l(+)l(-) -> tt transitions, resulting in qualitative improvements to global SMEFT fits.