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Proceedings of Correlations and Fluctuations in Relativistic Nuclear Collisions — PoS(CFRNC2006)

DOI: 10.22323/1.030.0024

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Energy Dependence of Multiplicity Fluctuations in Heavy Ion Collisions

Journal article published in 2007 by M. van Leeuwen, T. Anticic, Collaboration Na49, C. Alt, B. Baatar, D. Barna, J. Bartke, L. Betev, H. Białkowska, C. Blume, B. Boimska, M. Botje, J. Bracinik, R. Bramm, P. Buncic and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

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.