2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/207554The rare kaon decay K^+ --> π^+ ν\barν is considered in the framework of the models based on the SU(3)_C X SU(3)_L X U(1)_N (3 - 3 - 1) gauge group. It is shown that a lower bound of the Z' mass in the 3 - 3 - 1 model with right-handed neutrinos at a value of 3 TeV is derived, while that in the minimal version -- 1.7 TeV.7 pages, 1 figure, latexHigh Energy Physics - Phenomenologytext