Rapidity Dependence of Charged Antiparticle-to-Particle Ratios in Au+Au Collisions at $\sqrt{s_{NN}}=200$ GeV

et al. (BRAHMS collaboration); I. G. Bearden

Rapidity Dependence of Charged Antiparticle-to-Particle Ratios in Au+Au Collisions at $\sqrt{s_{NN}}=200$ GeV

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arxiv nucl-ex/0207006 v1 pith:B3XHOTR2 submitted 2002-07-12 nucl-ex

I. G. Bearden , et al. (BRAHMS collaboration) This is my paper · ORCID

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keywords ratiosapproxchargedcollisionsrapiditysqrtantiparticle-to-particleantiparticles

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abstract

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.

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A two-component initial baryon deposition model plus hydrodynamics reproduces baryon-antibaryon directed flow splitting across sqrt(sNN) = 7.7 to 200 GeV and yields a model-based baryon diffusion coefficient.

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