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Title: Energy dependence of multiplicity fluctuations in heavy ion collisions at 20A to 158A GeV

Abstract

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 {omega} are presented as functions of their dependence on collision energy as well as on rapidity and transverse momentum. The distributions have bell-like shapes 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 ultrarelativistic quantum molecular dynamics (UrQMD) model significantly overpredicts the mean, but it 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.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]; ; ; ;  [2]
  1. Fachbereich Physik der Universitaet, Frankfurt (Germany)
  2. Rudjer Boskovic Institute, Zagreb (Croatia)
Publication Date:
OSTI Identifier:
21192229
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 78; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.78.034914; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ATOM-ATOM COLLISIONS; CHARGED PARTICLES; COLLISIONS; CONSERVATION LAWS; DISTRIBUTION; ENERGY DEPENDENCE; FLUCTUATIONS; FORECASTING; GEV RANGE; HADRONS; HEAVY ION REACTIONS; LEAD; MOLECULAR DYNAMICS METHOD; MULTIPLICITY; PARTICLE RAPIDITY; RELATIVISTIC RANGE; RESONANCE; TRANSVERSE MOMENTUM

Citation Formats

Alt, C, Blume, C, Bramm, R, Dinkelaker, P, Flierl, D, Kliemant, M, Kniege, S, Lungwitz, B, Mitrovski, M, Renfordt, R, Schuster, T, Stock, R, Strabel, C, Stroebele, H, Utvic, M, Wetzler, A, Anticic, T, Kadija, K, Nicolic, V, and Susa, T. Energy dependence of multiplicity fluctuations in heavy ion collisions at 20A to 158A GeV. United States: N. p., 2008. Web. doi:10.1103/PHYSREVC.78.034914.
Alt, C, Blume, C, Bramm, R, Dinkelaker, P, Flierl, D, Kliemant, M, Kniege, S, Lungwitz, B, Mitrovski, M, Renfordt, R, Schuster, T, Stock, R, Strabel, C, Stroebele, H, Utvic, M, Wetzler, A, Anticic, T, Kadija, K, Nicolic, V, & Susa, T. Energy dependence of multiplicity fluctuations in heavy ion collisions at 20A to 158A GeV. United States. https://doi.org/10.1103/PHYSREVC.78.034914
Alt, C, Blume, C, Bramm, R, Dinkelaker, P, Flierl, D, Kliemant, M, Kniege, S, Lungwitz, B, Mitrovski, M, Renfordt, R, Schuster, T, Stock, R, Strabel, C, Stroebele, H, Utvic, M, Wetzler, A, Anticic, T, Kadija, K, Nicolic, V, and Susa, T. 2008. "Energy dependence of multiplicity fluctuations in heavy ion collisions at 20A to 158A GeV". United States. https://doi.org/10.1103/PHYSREVC.78.034914.
@article{osti_21192229,
title = {Energy dependence of multiplicity fluctuations in heavy ion collisions at 20A to 158A GeV},
author = {Alt, C and Blume, C and Bramm, R and Dinkelaker, P and Flierl, D and Kliemant, M and Kniege, S and Lungwitz, B and Mitrovski, M and Renfordt, R and Schuster, T and Stock, R and Strabel, C and Stroebele, H and Utvic, M and Wetzler, A and Anticic, T and Kadija, K and Nicolic, V and Susa, T},
abstractNote = {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 {omega} are presented as functions of their dependence on collision energy as well as on rapidity and transverse momentum. The distributions have bell-like shapes 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 ultrarelativistic quantum molecular dynamics (UrQMD) model significantly overpredicts the mean, but it 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.},
doi = {10.1103/PHYSREVC.78.034914},
url = {https://www.osti.gov/biblio/21192229}, journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 3,
volume = 78,
place = {United States},
year = {Mon Sep 15 00:00:00 EDT 2008},
month = {Mon Sep 15 00:00:00 EDT 2008}
}