2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/42317In this note we present additional arguments in favour of Kaluza and Klein picture of the world. In fact, we have shown that formula (\ref{KKpi}) provided by Kaluza-Klein approach with the fundamental scale early calculated (Eq.\ref{scale} \cite{1}) gives an excellent description for the mass spectrum of two-pion system.LaTex2e, 11 pages; 4 references added, 2 empty cells filledHigh Energy Physics - PhenomenologyHigh Energy Physics - ExperimentNuclear Experimenttext