Multiplicity Fluctuations in Heavy Ion Collisions at CERN SPS

Journal Article · Tue Feb 27 04:00:00 EST 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2714428· OSTI ID:21056867

Lungwitz, Benjamin ^[1]

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1. Fachbereich Physik der Universitaet, Frankfurt (Germany)

The system size and centrality dependence of multiplicity fluctuations in nuclear collisions at 158A GeV as well as the energy dependence for the most central Pb + Pb collisions were studied by the NA49 experiment at CERN SPS. A strong increase of fluctuations was observed with decreasing centrality in C + C, Si + Si and Pb + Pb collisions. The string hadronic models (UrQMD, Venus, HIJING, HSD) can not reproduce the observed increase. This may indicate a strong mixing of target and projectile contribution in a broad rapidity range. For the most central collisions at all SPS energies multiplicity distributions are significantly narrower than a corresponding Poisson one both for negatively and positively charged hadrons. The UrQMD model seems to reproduce the measured values on scaled variance. Statistical model calculations overpredict results when conservation laws are not taken into account.

• OSTI ID: 21056867
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 892; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CARBON 12 REACTIONS
CARBON 12 TARGET
CERN SPS SYNCHROTRON
CONSERVATION LAWS
DISTRIBUTION
ENERGY DEPENDENCE
FLUCTUATIONS
GEV RANGE
LEAD 208 REACTIONS
LEAD 208 TARGET
MOLECULAR DYNAMICS METHOD
MULTIPLICITY
PARTICLE RAPIDITY
QUANTUM CHROMODYNAMICS
SILICON 28 REACTIONS
SILICON 28 TARGET
STATISTICAL MODELS
STRING MODELS