Note on proton-antiproton suppression in 200 AGeV Au-Au collisions

Abstract

We discuss the measured nuclear suppression of p + pbar production in 200 AGeV Au-Au collisions at RHIC within radiative energy loss. For the AKK set of fragmentation functions, proton production is dominated by gluons, giving rise to the expectation that the nuclear suppression for p + pbar should be stronger than for pions due to the stronger coupling of gluons to the quenching medium. Using a hydrodynamical description for the soft matter evolution, we show that this is indeed seen in the calculation. However, the expected suppression factors for pions and protons are sufficiently similar that a discrimination with present data is not possible. In the high p_T region above 6 GeV where the contributions of hydrodynamics and recombination to hadron production are negligible, the model calculation is in good agreement with the data on p + pbar suppression.

arXiv comment3 pages, 2 figures, slightly expanded version

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• Identified hadron compositions in p+p and Au+Au collisions at high transverse momenta at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Constraining the Physics of Jet Quenching
• A Monte-Carlo model for elastic energy loss in a hydrodynamical background
• The Phenomenology of Elastic Energy Loss
• Decomposition of jet fragmentation function in high-energy heavy-ion collisions
• A study on the anomaly of $p$ over $\pi$ ratios in $Au+Au$ collisions with jet quenching
• Production and energy loss of strange and heavy quarks
• The Nuclear Suppression Factor for P_T increasing towards the Kinematic Limit
• RHIC physics overview