YFS Resummation for Future Lepton-Lepton Colliders in SHERPA

We present an implementation of the Yennie–-Frautschi–-Suura (YFS) scheme for the all-orders resummation of logarithms from the emission of soft real and virtual photons in processes that are critical for future lepton colliders. They include, in particular, $e^{-}{e}^{+}\to f\bar{f}$ and $e^{-}{e}^{+}\to W^{-}{W}^{+}$, where we validate the results of our implementation, improved with fixed-order corrections, with those obtained from the most precise calculations. We also show, for the first time, results for the Higgs-Strahlungs process, $e^-e^+\to ZH$,inYFSresummationincludingfixed-orderimprovementsuptoorder$\alpha^3L^3$.