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

Thorsten Renk·Kari J. Eskola
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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.

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Thorsten Renk, Kari J. Eskola. 2007-05-14. Note on proton-antiproton suppression in 200 AGeV Au-Au collisions. https://doi.org/10.1103/physrevc.76.027901

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