2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/200782On the basis of the confinement mechanism earlier proposed by author, the electric form factor of $η$-meson is nonperturbatively calculated. The latter is then applied to describe electromagnetic decay $η\to2γ$ which entails estimates for parameters of the confining SU(3)-gluonic field in $η$-meson. The corresponding estimates of the gluon concentrations, electric and magnetic colour field strengths are also adduced for the mentioned field.14 pages, LaTeXHigh Energy Physics - Phenomenologytext