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

被引：61

作者：

Alt, C. ^{[1
]}

Anticic, T. ^{[21
]}

Baatar, B. ^{[9
]}

Barna, D. ^{[5
]}

Bartke, J. ^{[7
]}

Betev, L. ^{[10
]}

Bialkowska, H. ^{[18
]}

Blume, C. ^{[1
]}

Boimska, B. ^{[18
]}

Botje, M. ^{[2
]}

Bracinik, J.

Bramm, R. ^{[1
]}

Buncic, P. ^{[10
]}

Cerny, V. ^{[4
]}

Christakoglou, P. ^{[3
]}

Chung, P. ^{[17
]}

Chvala, O. ^{[14
]}

Cramer, J. G. ^{[15
]}

Csato, P. ^{[5
]}

Dinkelaker, P.

Eckardt, V. ^{[13
]}

Flierl, D. ^{[1
]}

Fodor, Z. ^{[5
]}

Foka, P. ^{[8
]}

Friese, V. ^{[8
]}

Gal, J. ^{[5
]}

Gazdzicki, M. ^{[1
,11
]}

Genchev, V. ^{[16
]}

Georgopoulos, G. ^{[3
]}

Gladysz, E. ^{[7
]}

Grebieszkow, K. ^{[20
]}

Hegyi, S. ^{[5
]}

Hoehne, C. ^{[8
]}

Kadija, K. ^{[21
]}

Karev, A. ^{[13
]}

Kikola, D. ^{[20
]}

Kliemant, M. ^{[1
]}

Kniege, S. ^{[1
]}

Kolesnikov, V. I. ^{[9
]}

Kornas, E. ^{[7
]}

Korus, R. ^{[11
]}

Kowalski, M. ^{[7
]}

Kraus, I. ^{[8
]}

Kreps, M. ^{[4
]}

Laszlo, A. ^{[5
]}

Lacey, R.

van Leeuwen, M. ^{[2
]}

Levai, P. ^{[5
]}

Litov, L.

Lungwitz, B. ^{[1
]}

机构：

[1] Goethe Univ Frankfurt, Fachbereich Phys, Frankfurt, Germany

[2] NIKHEF, Amsterdam, Netherlands

[3] Univ Athens, Dept Phys, Athens, Greece

[4] Comenius Univ, Bratislava, Slovakia

[5] KFKI Res Inst Particle & Nucl Phys, Budapest, Hungary

[6] MIT, Cambridge, MA USA

[7] Polish Acad Sci, Henryk Niewodniczanski Inst Nucl Phys, Krakow, Poland

[8] Gesell Schwerionenforsch GSI, Darmstadt, Germany

[9] Joint Inst Nucl Res, Dubna, Russia

[10] CERN, Geneva, Switzerland

[11] Jan Kochanowski Univ Humanities & Sci, Inst Phys, Kielce, Poland

[12] Univ Marburg, Fachbereich Phys, D-3550 Marburg, Germany

[13] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

[14] Charles Univ Prague, Fac Math & Phys, Inst Nucl & Particle Phys, Prague, Czech Republic

[15] Univ Washington, Nucl Phys Lab, Seattle, WA 98195 USA

[16] Inst Nucl Energy Res, Sofia, Bulgaria

[17] SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA

[18] Inst Nucl Studies, PL-00681 Warsaw, Poland

[19] Univ Warsaw, Inst Expt Phys, Warsaw, Poland

[20] Warsaw Univ Technol, Fac Phys, Warsaw, Poland

[21] Rudjer Boskovic Inst, Zagreb, Croatia

来源：

PHYSICAL REVIEW C | 2008年 / 78卷 / 03期

关键词：

D O I：

10.1103/PhysRevC.78.034914

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

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 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.

引用

页数：24

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