2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/185207We discuss the production mechanism of partons via vacuum polarization during the very early, gluon dominated phase of an ultrarelativistic heavy-ion collision in the framework of the background field method of quantum chromodynamics.3 pages, Latex, 3 figures (eps), to be published in JPhysG, SQM2001 proceedingsHigh Energy Physics - Phenomenologytext