Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2007-09-11
PoSCPOD07:023,2007
Physics
Nuclear Physics
Nuclear Experiment
presented at Critical Point and Onset of Deconfinement, 4th International Workshop, July 9-13 2007, GSI Darmstadt, Germany, up
Scientific paper
Multiplicity fluctuations in the forward hemisphere were studied for positively, negatively and all charged hadrons produced in central Pb+Pb collisions at 20A, 30A, 40A, 80A and 158A GeV. The multiplicity distributions and their scaled variances are presented as a function of collision energy, rapidity and transverse momentum. The distributions have a bell-like shape and the scaled variance changes monotonously with energy in the range from 0.8 to 1.2. No indication of the critical point is observed. The string-hadronic model UrQMD reproduces results on the scaled variance. The predictions of the hadron-resonance gas model obtained within the grand-canonical and canonical ensembles for the scaled variance disagree with the data.
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