Speaker
Description
We demonstrate that the Feynman-Diagram (FD) gauge provides a transparent decomposition of SMEFT contributions according to scattering mechanisms and gauge-Higgs interaction vertices, enabling a direct physical interpretation of Wilson-coefficient effects in electroweak scattering. Building upon this framework, we study SMEFT effects in Zh production associated with neutrinos at future TeV-scale lepton colliders. We investigate how dimension-six operators modify the individual amplitude contributions and their interference, and identify the phase-space regions and kinematic observables that are particularly sensitive to these effects. Our analysis illustrates how the FD gauge can be used to trace deviations from the Standard Model back to the underlying scattering mechanisms and interaction vertices.