Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2008-01-25
Phys.Rev.Lett.101:232301,2008
Physics
Nuclear Physics
Nuclear Experiment
422 authors, 6 pages text, RevTeX-4, 4 figures, 1 Table. Submitted to Physical Review Letters. Plain text data tables for the
Scientific paper
10.1103/PhysRevLett.101.232301
For Au + Au collisions at 200 GeV we measure neutral pion production with good statistics for transverse momentum, p_T, up to 20 GeV/c. A fivefold suppression is found, which is essentially constant for 5 < p_T < 20 GeV/c. Experimental uncertainties are small enough to constrain any model-dependent parameterization for the transport coefficient of the medium, e.g. \mean(q^hat) in the parton quenching model. The spectral shape is similar for all collision classes, and the suppression does not saturate in Au+Au collisions; instead, it increases proportional to the number of participating nucleons, as N_part^2/3.
Adare Andrew
PHENIX Collaboration
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