Speaker
Description
We show results for the next-to-leading order electroweak corrections to $e^+e^− \to W^+W^−$ from dimension-six two-fermion top-quark operators in the SMEFT. We discuss the analytical computation and show results for future electron–positron colliders,focusing on the proposed LEP3 and FCC-ee that will operate at centre of mass energies below the $t\bar t$ production threshold. We compare the indirect sensitivity arising from virtual corrections to $ W^+W^−$ production to that from $ZH$ production, and to the current constraints from LEP and LHC data. Our results show that NLO corrections can provide competitive sensitivity to these operators. This work represents a first step toward the systematic computation of electroweak corrections to $W$-pair production at lepton colliders in the SMEFT.