Speaker
Description
At future high-energy colliders, such as a multi-TeV muon collider or the high-energy stages of a linear $e^+e^-$ collider, collinear radiation of electroweak gauge bosons becomes significant. In this regime, vector-boson fusion and vector-boson scattering processes play a pivotal role in phenomenological studies, exhibiting kinematic signatures distinct from traditional $s$-channel annihilation. Electroweak Parton Distribution Functions (EWPDFs) provide a robust framework to describe these interactions by resumming large collinear logarithms and enabling a partonic interpretation of the hard-scattering process. In this contribution, we present the current status of the EWPDF formalism's implementation within the Monte Carlo event generator WHIZARD. We demonstrate several applications of this framework and provide detailed comparisons with full fixed-order matrix element calculations. Our results emphasize the necessity of this formalism for the ongoing R&D and physics potential studies of future lepton colliders.