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 $b\rightarrow s$ flavor changing neutral current transitions $Z \to b \bar b$ in three stages: using existing data from the LHC $B$-factories, projections for HL-LHC Belle II, studying additional new physics impact a future lepton collider. The latter is ideally suited to directly probe $\ell^+\ell^-\rightarrow t\bar t$ transitions. observe powerful synergies both top beauty observables as flat directions are removed more operators can be probed. find that collider significantly enhances this interplay qualitatively improves SMEFT fits.