Multiplicity fluctuations in proton–proton and nucleus–nucleus collisions

Konchakovski, V. P.; Gorenstein, M. I.; Bratkovskaya, Elena

doi:10.1016/j.physletb.2007.06.032

Cited by 20 publications

(38 citation statements)

References 45 publications

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“…String-hadronic models predict similar values of ω for p + p and Pb+Pb collisions [17,30]. In a hadron-gas model [16], the scaled variance converges quickly to a constant value with increasing volume of the system.…”

Section: Measure Of Multiplicity Fluctuationsmentioning

confidence: 91%

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Energy dependence of multiplicity fluctuations in heavy ion collisions at20Ato158AGeV

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Botje

2008

Phys. Rev. C

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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 ω 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.

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Section: Measure Of Multiplicity Fluctuationsmentioning

confidence: 91%

“…The energy dependence for central (b = 0) Pb+Pb collisions obtained by the HSD model are presented in Ref. [30]. These predictions were compared with preliminary NA49 results on multiplicity fluctuations in Ref.…”

Section: B String-hadronic Modelsmentioning

confidence: 96%

Energy dependence of multiplicity fluctuations in heavy ion collisions at20Ato158AGeV

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Botje

2008

Phys. Rev. C

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“…Note, that the energy dependence of multiplicity fluctuations is also predicted within the HSD model [14], but calculations for the NA49 acceptance are not published.…”

Section: Comparison To Modelsmentioning

confidence: 99%

Energy dependence of fluctuations in central Pb+Pb collisions from NA49 at the CERN SPS

Rybczyński¹

2008

J. Phys. G: Nucl. Part. Phys.

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The latest NA49 results on fluctuations of multiplicity and average transverse-momentum analyzed on an event-by-event basis are presented for central Pb+Pb interactions over the whole SPS energy range (20A -158A GeV). The scaled variance of the multiplicity distribution decreases with collision energy whereas the Φp T measure of pT fluctuations is small and independent of collision energy. Thus in central Pb+Pb collisions these fluctuations do not show an indication of the critical point of strongly interacting matter.

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“…The difference between transport and statistical models also changes when we go from ω to σ . The difference becomes larger with energy for the scaled variance [31] but for σ it is more pronounced for smaller energies.…”

Section: Ratio Fluctuationsmentioning

confidence: 91%

Fluctuations and correlations from microscopic transport theory

Konchakovski¹

2010

Proceedings of 5th International Workshop on Critical Point and Onset of Deconfinement — PoS(CPOD 2009)

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The multiplicity fluctuations in A+A collisions at SPS and RHIC energies are studied within the HSD transport approach. We find a dominant role of the fluctuations in the nucleon participant number for the final fluctuations. In order to extract physical fluctuations one should decrease the fluctuations in the participants number. This can be done considering very central collisions. The system size dependence of the multiplicity fluctuations in central A+A collisions at the SPS energy range -obtained in the HSD and UrQMD transport models -is presented. The results can be used as a 'background' for experimental measurements of fluctuations as a signal of the critical point. Event-by-event fluctuations of the K/π, K/p and p/π ratios in A+A collisions are also studied. Event-by-event fluctuations of the kaon to pion number ratio in nucleus-nucleus collisions are studied for SPS and RHIC energies. We find that the HSD model can qualitatively reproduce the measured excitation function for the K/π ratio fluctuations in central Au+Au (or Pb+Pb) collisions from low SPS up to top RHIC energies. The forward-backward correlation coefficient measured by the STAR Collaboration in Au+Au collisions at RHIC is also studied. We discuss the effects of initial collision geometry and centrality bin definition on correlations in nucleus-nucleus collisions. We argue that a study of the dependence of correlations on the centrality bin definition as well as the bin size may distinguish between these 'trivial' correlations and correlations arising from 'new physics'.

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Multiplicity fluctuations in proton–proton and nucleus–nucleus collisions

Cited by 20 publications

References 45 publications

Energy dependence of multiplicity fluctuations in heavy ion collisions at20Ato158AGeV

Energy dependence of multiplicity fluctuations in heavy ion collisions at20Ato158AGeV

Energy dependence of fluctuations in central Pb+Pb collisions from NA49 at the CERN SPS

Fluctuations and correlations from microscopic transport theory

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