Rapidity Dependence Of Charged Antihadron To Hadron Ratios In Au Plus Au Collisions At Root(Nn)-N-S=200 Gev

We present ratios of the numbers of charged antihadrons to hadrons (pions, kaons, and protons) in Au + Au collisions at roots(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) over bar /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 mu(B) approximate to 130 MeV at y = 3 to mu(B) approximate to 25 MeV at y = 0.