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The centrality dependence of rapidity distributions of pions in Pb+Pbreactions can be understood by imposing local energy-momentum conservation inthe longitudinal "fire-streaks" of excited matter. With no tuning noradjustment to the experimental data, the rapidity distribution of pionsproduced by the fire-streak which we obtained from Pb+Pb collisions reproducesthe shape of the experimental pion rapidity distribution in p+p interactions,measured by the NA49 Collaboration at the same energy. The observed differencein the absolute normalization of this distribution can be explained by thedifference in the overall energy balance, induced by baryon stopping andstrangeness enhancement phenomena occurring in heavy ion collisions. Weestimate the latter effects using a collection of SPS experimental data on$\pi^\pm$, $K^\pm$, net $p$, and $n$ production in p+p and Pb+Pb reactions.Implications of the above findings are discussed.

physical review. c

Can pion spectra in Pb+Pb collisions at CERN SPS energies be described  by those in p+p reactions and energy-momentum conservation ? Rapidity  distributions of pions in p+p and Pb+Pb collisions at CERN SPS energies