Multiplicity fluctuations in proton-proton and nucleus-nucleus collisions

被引：18

作者：

Konchakovski, V. P.

Gorenstein, M. I.

Bratkovskaya, E. L. ^{[1
]}

机构：

[1] Frankfurt Inst Adv Studies, Frankfurt, Germany

[2] Bogolyubov Inst Theoret Phys, Kiev, Ukraine

[3] Goethe Univ Frankfurt, Helmholtz Res Sch, D-6000 Frankfurt, Germany

来源：

PHYSICS LETTERS B | 2007年 / 651卷 / 2-3期

关键词：

nucleus-nucleus collisions; fluctuations; transport models; statistical models;

D O I：

10.1016/j.physletb.2007.06.032

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the scaled variances of multiplicity fluctuations in nucleus-nucleus collisions at SPS and RHIC energies within the HSD transport model. The HSD results are compared with proton-proton data and with predictions of the hadron-resonance gas statistical model. We find that the HSD scaled variances omega(i) for negatively, positively, and all charged hadrons in central nucleus-nucleus collisions remain close to the omega(i) values in proton-proton collisions and increase with collision energy as the corresponding multiplicities per participating nucleon. The statistical model predicts very different behavior of omega(i). However, a comparison with preliminary NA49 data for the most central Pb + Pb collisions at SPS energies does not permit to distinguish the HSD and statistical model results. New measurements of the multiplicity fluctuations in nucleus-nucleus collisions in a wide energy region with large acceptance are needed to allow for a proper determination of the underlying dynamics. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：114 / 118

页数：5

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