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HK: Fachverband Physik der Hadronen und Kerne
HK 26: Physik mit schweren Ionen
HK 26.1: Talk
Wednesday, March 14, 2007, 11:15–11:30, F
Energy Dependence of Multiplicity Fluctuations in Heavy Ion Collisions — •Benjamin Lungwitz1, Christopher Alt1, Alexandra Argyrakis1, Christoph Blume1, Peter Dinkelaker1, Volker Friese2, Marek Gazdzicki1, Claudia Höhne2, Michael Kliemant1, Stefan Kniege1, Dmytro Kresan2, Michael Mitrovski1, Rainer Renfordt1, Tim Schuster1, Reinhard Stock1, Claudia Strabel1, Herbert Ströbele1, Millica Utvic1, Alexander Wetzler1, and Dmytro Kresan2 for the NA49 collaboration — 1Fachbereich Physik der Universität Frankfurt — 2Gesellschaft für Schwerionenforschung (GSI), Darmstadt
The energy dependence of multiplicity fluctuations was studied for the most central Pb+Pb collisions at 20A, 30A, 40A, 80A and 158A GeV by the NA49 experiment at the CERN SPS. The multiplicity distribution for negatively and positively charged hadrons is significantly narrower than Poisson one for all energies. No significant structure in energy dependence of the scaled variance of multiplicity fluctuations is observed. The measured scaled variance is lower than the one predicted by the grand-canonical formulation of the hadron-resonance gas model. The results for scaled variance are in approximate agreement with the string-hadronic model UrQMD.