Collision geometry scaling of Au+Au pseudorapidity density from sqrt(sNN) = 19.6 to 200 GeV
B. B. Back
Abstract
The centrality dependence of the midrapidity charged particle multiplicity in Au+Au collisions at sqrt(sNN) = 19.6 and 200 GeV is presented. Within a simple model, the fraction of hard (scaling with number of binary collisions) to soft (scaling with number of participant pairs) interactions is consistent with a value of x = 0.13 +/- 0.01(stat) +/- 0.05(syst) at both energies. The experimental results at both energies, scaled by inelastic p(pbar)+p collision data, agree within systematic errors. The ratio of the data was found not to depend on centrality over the studied range and yields a simple linear scale factor of R(200/19.6) = 2.03 +/- 0.02(stat) +/- 0.05(syst).
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