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

TL;DR

This paper analyzes how combining top-quark and beauty observables in SMEFT fits enhances the detection of new physics, with future colliders providing significant improvements over current data.

Contribution

It demonstrates the powerful synergies between top and beauty measurements in SMEFT fits and highlights the impact of future colliders on these analyses.

Findings

Synergies in top and beauty observables improve operator constraints.

Future lepton colliders significantly enhance SMEFT fit sensitivity.

Combining data removes flat directions in parameter space.

Abstract

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 and $Z \to b \bar b$ 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 $\ell^+\ell^-\rightarrow t\bar t$ 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.