2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49123Event characteristics of $W$ boson production at HERA collider are untrivial and sensitive to the production mechanisms. We analyse the distributions of the four particle final state defined by the complete set of $W$ producing perturbative leading order diagrams in the Standard Model and its extension with the anomalous effective lagrangian in the gauge sector.11 pages, LaTeX, 5 figures, contribution to DESY Workshop 1998-1999 "Monte Carlo Generators for HERA Physics"High Energy Physics - Phenomenologytext