2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/37622We present recent studies about the `underlying event' which originates mostly from soft spectator interactions. First Run II data results are compared to published Run I results and to QCD Monte Carlo models.7 pages, 4 figures, Presented at 11th International Workshop on Deep Inelastic Scattering (DIS 2003), St. Petersburg, Russia, 23-27 Apr 2003High Energy Physics - Experimenttext