Speaker
Description
Since the late 1970ies/early 1980ies it is known that subtle field-theoretical aspects of gauge symmetry require a treatment of the (electro)weakly interacting particles going beyond standard perturbation theory. This is possible by augmenting perturbation theory by the Fröhlich-Morchio-Strocchi mechanism, which primarily affects the asymptotic initial states and final states. This has been corroborated in many theoretical investigations in the last decade. While a subleading effect at past experiments, current and future experiments will be able to probe these effects. This is discussed for examples of vector boson properties and interactions, as well as electroweak resummation effects. Indications for visible effects are found close to thresholds and at very high energies. The latter may substantially affect predictions for future high-energy lepton colliders.
