2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45998We consider the virtual signals of a $Z'$ of very general type in the process $e^+e^-\to W^+W^-$ at a future linear $e^+e^-$ collider of 2000 GeV c.m. energy ($LC2000$). We show that possible deviations from the SM predictions in this channel are related to similar deviations in the purely leptonic one in a way that is only characteristic of this $Z'$ model, and not in general of possible competitor models with anomalous gauge couplings.9 pages. (e-mail renard@lpmsun2.lpm.univ-montp2.fr)High Energy Physics - Phenomenologytext