Proton-antiproton suppression in 200A GeV Au-Au collisions
Feb, 2007
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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.- 25.75.Gz
- 25.75.Dw
- 25.75.-q
- scattering: heavy ion
- gold
- hadron: multiple production
- nuclear matter: effect
- yield: (p anti-p)
- yield: (pi+ pi-)
- transverse momentum: spectrum
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