2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/146043Scalar field systems containing higher derivatives are studied and quantized by Hamiltonian path integral formalism. A new point to previous quantization methods is that field functions and their derivatives with time are considered as independent canonical variables. Consequently, generating functional, explicit expressions of propagators and Feynman diagrams in $ϕ^3$ theory are found5 pages, 0 figures, update Jan 17th 2008High Energy Physics - Theorytext