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

Abstract

We perform global fits within Standard Model Effective Field Theory (SMEFT) combining top-quark pair production processes and decay with $b\to s$ 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 ${\ell }^{+}{\ell }^{-}\to t\bar{t}$ 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.

arXiv comment34 pages, 15 figures, v2: Corrected matching conditions between SMEFT and WET. Included data on top-quark decay width. Changed the scale of coefficients to 1 TeV and included EW RGE effects. Added a plot on constraints from B data in SMEFT basis. Conclusions unchanged

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