2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/179642The analysis of the newest data on the leptonic $Z$-decays and $m_W$ appears to reveal the first manifestations of electroweak radiative corrections. In fact, these data differ, at the level of $2σ$, from their electroweak Born values, while they agree, to within $1σ$, with the theoretical values which take the electroweak radiative corrections into account. Previous data were within $1σ$ in agreement with both sets of values.10 pages, 2 figures, preprint CERN-TH.7217/94High Energy Physics - Phenomenologytext