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          Institute: MPI für Physik     Collection: MPI für Physik     Display Documents



ID: 543262.0, MPI für Physik / MPI für Physik
Energy Dependence of Multiplicity Fluctuations in Heavy Ion Collisions at 20 A to 158 A GeV
Authors:NA49 Collaboration; Alt, C.; Eckardt, V.; Schmitz, N.; Seyboth, P.; et al.
Date of Publication (YYYY-MM-DD):2008
Title of Journal:Physical Review C
Journal Abbrev.:Phys.Rev.C
Issue / Number:78
Start Page:034914
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:Multiplicity fluctuations of positively, negatively and all charged hadrons in the forward hemisphere were studied in central Pb+Pb collisions at 20A, 30A, 40A, 80A and 158A GeV. The multiplicity distributions and their scaled variances are presented in dependence of collision energy as well as of rapidity and transverse momentum. The distributions have bell-like shape and their scaled variances are in the range from 0.8 to 1.2 without any significant structure in their energy dependence. No indication of the critical point in fluctuations are observed. The string-hadronic model UrQMD significantly overpredicts the mean, but approximately reproduces the scaled variance of the multiplicity distributions. The predictions of the statistical hadron-resonance gas model obtained within the grand-canonical and canonical ensembles disagree with the measured scaled variances. The narrower than Poissonian multiplicity fluctuations measured in numerous cases may be explained by the impact of conservation laws on fluctuations in relativistic systems.
Classification / Thesaurus:NA49
Comment of the Author/Creator:26 pages, 34 figures, updated version including referee comments
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Physik
Identifiers:LOCALID:MPP-2008-222
URL:http://www.slac.stanford.edu/spires/find/hep/www?r...
URL:http://arXiv.org/abs/arxiv:0712.3216
URL:http://publications.mppmu.mpg.de/?action=search&mp...
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