2022/12/16 by Axel Maas, Franziska Reiner · 1 voice
Physics and Astronomy · #hep-ph #hep-ex
paper · pdf · doi:10.1103/physrevd.108.013001
arxiv published 2022/12/16 · arxiv updated 2023/07/07
The electroweak gauge symmetry cannot be broken in a literal sense due to Elitzur's theorem. Thus, asymptotic states need to be manifestly and non-perturbatively gauge-invariant with respect to the electroweak symmetry. To take this suitably into account perturbation theory augmented by the Fröhlich-Morchio-Strocchi mechanism can be used. We show that this restores the Bloch-Nordsieck theorem in electroweak processes in the standard model. This has potentially substantial impact at, e.g., future lepton colliders, but has only negligible effects at lower energies. We also demonstrate an alternative implementation using PDFs, which allows an approach with manifest electroweak Bloch-Nordsieck theorem also at hadron colliders.