We report on the implementation of an interface between the SANC generator framework for Drell-Yan hard processes, which includes next-to-leading order electroweak (NLO EW) corrections, and the Herwig++ and Pythia8 QCD parton shower Monte Carlos. A special aspect of this implementation is that the initial-state shower evolution in both shower generators has been augmented to handle the case of an incoming photon-in-a-proton, diagrams for which appear at the NLO EW level. The difference between shower algorithms leads to residual differences in the relative corrections of 2-3% in the p_T(mu) distributions at p_T(mu)>~50 GeV (where the NLO EW correction itself is of order 10%).
@article{arxiv.1011.5444,
title = {QCD parton showers and NLO EW corrections to Drell-Yan},
author = {P. Richardson and R. R. Sadykov and A. A. Sapronov and M. H. Seymour and P. Z. Skands},
journal= {arXiv preprint arXiv:1011.5444},
year = {2015}
}