Rapidity Dependence of Charged Antihadron to Hadron Ratios in A u + A u Collisions at s N N = 200 G e V

Niels Bohr Institute, Blegdamsvej 17, University of Copenhagen, Copenhagen 2100, Denmark.
Physical Review Letters (Impact Factor: 7.51). 04/2003; 90(10):102301. DOI: 10.1103/PhysRevLett.90.102301
Source: PubMed


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

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