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

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

2007-02-09

arxiv.org/abs/hep-ph/0702096v2

Phys.Rev.C76:027901,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, 2 figures, slightly expanded version

Scientific paper

10.1103/PhysRevC.76.027901

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.

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