Rapidity dependence of charged antihadron to hadron ratios in Au + Au collisions at S(NN)**(1/2) = 200-GeV.

We present ratios of the numbers of charged antihadrons to hadrons (pions, kaons, and protons) in Au + Au collisions at √ S NN = 200 GeV as a function of rapidity in the range y = 0-3. While the ratios at midrapidity are approaching unity, the K - /K + and p/p ratios decrease significantly at forward rapidities. An interpretation of the results within the statistical model indicates a reduction of the baryon chemical potential from μ B 130 MeV at y = 3 to μ B 25 MeV at y = 0.