The closed galaxy model, particle production mechanisms and the effects of scaling violation on π/p ratio

Abstract

We present here an analysis of the nature of the problematical π/p ratio on the basis of the modified (or revised) closed galaxy model (MCGM) and the two forms of scaling violation effect one of which is called the model with moderate violation of Feynman scaling and the other called model with stronger violation of Feynman scaling at very high energies. Using both the JACEE and the non-JACEE forms of primary nucleon spectra, the theoretical values obtained with these two types of scaling violation forms and the modified closed galaxy model are always greater than experimental measurements, especially at low energies. Attempts to account for these discrepancies have also been made.