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Rapidity Dependence of Charged Antihadron to Hadron Ratios in A u + A u Collisions at s N N </mml:…

2003; American Physical Society; Volume: 90; Issue: 10 Linguagem: Inglês

10.1103/physrevlett.90.102301

1092-0145

I. G. Bearden, D. Beavis, C. Beşliu, Y. Blyakhman, B. Budick, H. Bøggild, C. Chasman, C. H. Christensen, P. Christiansen, J. Cibor, R. Debbe, E. Enger, J. J. Gaardhøje, M. Germinario, K. Hagel, Ole Hansen, Anders Holm, A.K. Holme, H. Ito, Emil Jakobsen, A. Jipa, F. Jundt, J. I. Jørdre, C. E. Jørgensen, R. Karabowicz, T. Keutgen, E. J. Kim, T. Kozik, Thomas M. Larsen, J. H. Lee, Y. K. Lee, G. Løvhøiden, Z. Majka, A. Makeev, B. McBreen, M. Mikelsen, M. Murray, J. B. Natowitz, B. S. Nielsen, J. P. Norris, K. Olchanski, J. W. Olness, D. Ouerdane, R. Płaneta, F. Rami, C. Ristea, D. Röhrich, B. H. Samset, D. Sandberg, S. Sanders, R.A. Scheetz, P. Staszel, T. S. Tveter, F. Videbæk, R. Wada, A. Wieloch, Z. Yin, I. S. Zgură,

Particle physics theoretical and experimental studies

We present ratios of the numbers of charged antiparticles to particles (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 particle ratios at midrapidity are approaching unity, the $K^-/K^+$ and $\bar{p}/p$ ratios decrease significantly at forward rapidities. An interpretation of the results within the statistical model indicates a reduction of the baryon chemical potential from $\mu_B \approx 130$MeV at $y$=3 to $\mu_B \approx 25$MeV at $y$=0.