WINHAC - the Monte Carlo event generator for single W-boson production in hadronic collisions

摘要

We present the Monte Carlo event generator WINHAC for the charged-currentDrell-Yan process, i.e. single W-boson production with leptonic decays inhadronic collisions. It features multiphoton radiationwithin theYennie-Frautschi-Suura exclusive exponentiation scheme with O(alpha)electroweak corrections. For the initial-state QCD/QED parton shower andhadronisation it is interfaced directly to PYTHIA. It implements the optionsfor proton-proton, proton-antipronton and any nucleus-nucleus collisions.Moreover, it includes the polarized W-boson production and the neutral currentDrell-Yan process, both at the Born level. Generation of weighted as well asunweighted (weight=1) events is possible. WINHAC has been thoroughly testednumerically and cross-checked with independent Monte Carlo programs, such asHORACE and SANC; in the so-called tuned comparisons, an agreement at thesub-permil-level has been reached. It has also been used as a basic tool fordeveloping and testing some new measurement methods of the Standard Modelparameters at the LHC.