The rapidity dependence of the proton-to-pion ratio in Au+Au and p+p collisions at image and 200 GeV Original Research Article

The BRAHMS measured proton-to-pion ratios in Au+Au and p+p collisions at View the MathML source and View the MathML source are presented as a function of transverse momentum and collision centrality within the pseudo-rapidity range 0⩽η⩽3.8. The results for Au+Au at View the MathML source are compared with predictions from models which incorporate hydro-dynamics, hadron rescattering and jet production, in the η interval covered. In Au+Au collisions at View the MathML source, η≈2.2, and at View the MathML source, η=0, the bulk medium can be characterized by the common value of μB≈65 MeV. The p/π+(pT) ratios measured for these two selections display a striking agreement in the pT range covered (up to 2.2 GeV/c). At a collision energy of 62.4 GeV and at forward pseudo-rapidity we found a crossing point of p/π+ ratios measured in central and semi-peripheral Au+Au and in p+p reactions. The crossing occurs in the narrow η bin around value of 3.2, simultaneously in the whole covered pT range (0.3 GeV/c