2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/109918With usage of obvious mechanisms of quark currents the amplitudes of leptonic decaies of pseudoscalar mesons are investigated. The estimation for a constant of leptonic decay of the D+ meson is obtained, f_D+ ~ 0.23 GeV.7 pages, 2 figuresHigh Energy Physics - Phenomenologytext