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The proton-to-pion ratios measured in the BRAHMS experiment for Au+Au and p+pcollisions at $\sqrt{s_{NN}}$ = 62.4 and 200 GeV are presented as a function oftransverse momentum and collision centrality at selected pseudorapidities inthe range of 0 to 3.8. A strong pseudorapidity dependence of these ratios isobserved. We also compare the magnitude and p_T-dependence of the p/pi ratiosmeasured in Au+Au collisions at \rootsnn{200} and $\eta \approx 2.2$ with thesame ratio measured at \rootsnn{62.4} and $\eta = 0$. The great similarityfound between these ratios throughout the whole p_T range (up to 2.2 GeV/$c$)is consistent with particle ratios in A+A collisions being described withgrand-canonical distributions characterized by the baryo-chemical potential\mibn. At the collision energy of 62.4 GeV, we have observed a unique point inpseudorapidity, $\eta = 3.2$, where the p/pi+ ratio is independent of thecollision system size in a wide p_T-range of $0.3 \le p_{T} \le 1.8$ GeV/$c$.

Rapidity dependence of the proton-to-pion ratio in Au+Au and p+p collisions at sqrt(s_NN) = 62.4 and 200 GeV