WWGENPV 2.0 — A Monte Carlo event generator for four-fermion production at e+e− colliders Original Research Article

The Monte Carlo program WWGENPV, designed for computing distributions and generating events for four-fermion production in e+e− collisions, is described. The new version, 2.0, includes the full set of the electroweak (EW) tree-level matrix elements for double- and single-W production, initial- and final-state photonic radiation including pt/pl effects in the Structure Function formalism, all the relevant non-QED corrections (Coulomb correction, naive QCD, leading EW corrections). An hadronization interface to JETSET is also provided. The program can be used in a three-fold way: as a Monte Carlo integrator for weighted events, providing predictions for several observables relevant for W physics; as an adaptive integrator, giving predictions for cross sections, energy and invariant mass losses with high numerical precision; as an event generator for unweighted events, both at partonic and hadronic level. In all the branches, the code can provide accurate and fast results.