2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41916The Lund string fragmentation model is applied in a non-perturbative calculation of the invariant production cross section of pions from proton-proton collisions in the soft pT region. Invariant production cross sections of pions and kaons from proton-proton collisions in the hard pT region are calculated from the Feynman-Field perturbative QCD parton model. Parameterizations of these production invariant cross sections are described.30 pages, 19 figures and 2 tablesHigh Energy Physics - Phenomenologytext