Rapidity Dependence of Charged Antihadron to Hadron Ratios in $\mathrm{A}\mathrm{u}+\mathrm{A}\mathrm{u}$ Collisions at $\sqrt{s_{NN}}=200\mathrm{G}\mathrm{e}\mathrm{V}$

We present ratios of the numbers of charged antihadrons to hadrons (pions, kaons, and protons) in $\mathrm{A}\mathrm{u}+\mathrm{A}\mathrm{u}$ collisions at $\sqrt{s_{NN}}=200\mathrm{G}\mathrm{e}\mathrm{V}$ as a function of rapidity in the range $y=0–3$. While the ratios at midrapidity are approaching unity, the $K^{-}/K^{+}$ and $\overline{p}/p$ ratios decrease significantly at forward rapidities. An interpretation of the results within the statistical model indicates a reduction of the baryon chemical potential from ${\mu }_B\approx 130\mathrm{M}\mathrm{e}\mathrm{V}$ at $y=3$ to ${\mu }_B\approx 25\mathrm{M}\mathrm{e}\mathrm{V}$ at $y=0$.