2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/37139Preliminary results on $e^+ e^- \to f \bar{f}$, $f=e, μ, τ, q$, including all LEP2 data are discussed. Good agreement is found with the Standard Model up to the highest energies. Limits on possible new physics are extracted.8 pages, 4 figures, to appear in the Proceedings of the New Trends in High-Energy Physics, Yalta, Ukraine, September 22 - 29, 2001High Energy Physics - Experimenttext