2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/180458The amplitude for the forward electroproduction of two light vector mesons can be written completely within perturbative QCD in the Regge limit with next-to-leading accuracy, thus providing the first example of a physical application of the BFKL approach at the next-to-leading order. Recently, a numerical determination of the amplitude has been obtained in the case of equal photon virtualities, by using a definite representation for the amplitude and a definite optimization method for the perturbative series. Here, we study the main systematic effects in the previous determination, by considering a different representation of the amplitude and different optimization methods of the perturbative series. Moreover, we compare our result for the differential cross section at the minimum $|t|$ with a different approach, based on collinear kernel improvement.7 pages, 4 figures; proceedings of DIFFRACTION 2006, Workshop on Diffraction in High-Energy Physics, Milos (Greece), Sep. 5-10, 2006High Energy Physics - Phenomenologytext