arXiv:1011.5444·v3·High Energy Physics — Phenomenology
QCD parton showers and NLO EW corrections to Drell-Yan
P. Richardson (1)🇬🇧 · R. R. Sadykov (2)🇷🇺 · A. A. Sapronov (2)🇷🇺 · M. H. Seymour (3)🇬🇧 · P. Z. Skands (4) ((1) Institute for Particle Physics Phenomenology, University of Durham, (2) Joint Institute for Nuclear Research, (3) School of Physics and Astronomy, The University of Manchester, (4) Theoretical Physics, CERN)🇨🇭
Abstract
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%).
Comments: 20 pages, 12 postscript figures, uses axodraw.sty, feynmf, subfiles.sty