dorsal/arxiv
View SchemaMultiplicity fluctuations in relativistic nuclear collisions: statistical model versus experimental data
| Authors | V. V. Begun, M. Gazdzicki, M. I. Gorenstein, M. Hauer, V. P. Konchakovski, B. Lungwitz |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0611075 |
| URL | https://arxiv.org/abs/nucl-th/0611075 |
| DOI | 10.1103/PhysRevC.76.024902 |
| Journal | Phys.Rev.C76:024902,2007 |
Abstract
The multiplicity distributions of hadrons produced in central nucleus-nucleus collisions are studied within the hadron-resonance gas model in the large volume limit. The microscopic correlator method is used to enforce conservation of three charges - baryon number, electric charge, and strangeness - in the canonical ensemble. In addition, in the micro-canonical ensemble energy conservation is included. An analytical method is used to account for resonance decays. The multiplicity distributions and the scaled variances for negatively, positively, and all charged hadrons are calculated along the chemical freeze-out line of central Pb+Pb (Au+Au) collisions from SIS to LHC energies. Predictions obtained within different statistical ensembles are compared with the preliminary NA49 experimental results on central Pb+Pb collisions in the SPS energy range. The measured fluctuations are significantly narrower than the Poisson ones and clearly favor expectations for the micro-canonical ensemble. Thus this is a first observation of the recently predicted suppression of the multiplicity fluctuations in relativistic gases in the thermodynamical limit due to conservation laws.
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"abstract": "The multiplicity distributions of hadrons produced in central nucleus-nucleus\ncollisions are studied within the hadron-resonance gas model in the large\nvolume limit. The microscopic correlator method is used to enforce conservation\nof three charges - baryon number, electric charge, and strangeness - in the\ncanonical ensemble. In addition, in the micro-canonical ensemble energy\nconservation is included. An analytical method is used to account for resonance\ndecays. The multiplicity distributions and the scaled variances for negatively,\npositively, and all charged hadrons are calculated along the chemical\nfreeze-out line of central Pb+Pb (Au+Au) collisions from SIS to LHC energies.\nPredictions obtained within different statistical ensembles are compared with\nthe preliminary NA49 experimental results on central Pb+Pb collisions in the\nSPS energy range. The measured fluctuations are significantly narrower than the\nPoisson ones and clearly favor expectations for the micro-canonical ensemble.\nThus this is a first observation of the recently predicted suppression of the\nmultiplicity fluctuations in relativistic gases in the thermodynamical limit\ndue to conservation laws.",
"arxiv_id": "nucl-th/0611075",
"authors": [
"V. V. Begun",
"M. Gazdzicki",
"M. I. Gorenstein",
"M. Hauer",
"V. P. Konchakovski",
"B. Lungwitz"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.76.024902",
"journal_ref": "Phys.Rev.C76:024902,2007",
"title": "Multiplicity fluctuations in relativistic nuclear collisions: statistical model versus experimental data",
"url": "https://arxiv.org/abs/nucl-th/0611075"
},
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