2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/205018We report on the calculation of the next-to-leading order QCD corrections to the production of W-boson pairs in association with a hard jet at hadron colliders, which is an important source of background for Higgs and new-physics searches. If a veto against the emission of a second hard jet is applied, the corrections stabilize the leading-order prediction for the cross section considerably.6 pages, latex, 4 ps figures, to appear in the proceedings of the "8th International Symposium on Radiative Corrections (RADCOR07)", Florence, Italy, October 1-5, 2007High Energy Physics - Phenomenologytext