2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/210623General formulas as well as leading asymptotics for corrections to Z- and W-boson parameters are derived. Experimental data fits in Standard Model and its extensions are discussed and results are presented.3 lectures delivered at II Helmholtz International Summer School "Heavy Quark Physics", Dubna, 11-21 August 2008High Energy Physics - Phenomenologytext