2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/42280The hadronic vacuum-polarization contribution to the muon anomalous magnetic moment a_{mu}(hadr) and to the value of the eleectromagnetic coupling constant at q^2 = M^2_z are determined more precisely in connection with a new more exact value of the electronic width of rho-meson. The QCD model with infinite number of vector mesons is used. The more precisely determined results are: a_{mu}(hadr) = 678(7)*10^{-10}, δα_{hadr}(M^2_z) = 0.02786(6).4 pages, latexHigh Energy Physics - Phenomenologytext