Unified description of large and small pT spectra in pp collisions at PS and ISR energies

Abstract

The inclusive spectra for pp → p, K ± and π ±X are analysed, separating the data into two components according to the flow of valence urbaryons. Each component is compared with the whole region formula composed of three factors, i.e. the normalization constant, an inverse power function in the transverse mass squared, and a scaling function of the radial and Feynman variables. A global agreement with the data is obtained concerning p T dependence connecting large and small p T, s dependence between PS and ISR and within ISR energies as well as the x dependence throughout the central and fragmentation regions up to the kinematical boundary. Difficulties are the pion distribution at very small p T and x, and the two-component separation of pions related to the counting violation.