Event-by-event fluctuations of average transverse momentum in central Pb plus Pb collisions at 158 GeV per nucleon

被引：178

作者：

Appelshäuser, H

Bächler, J

Bailey, SJ

Barna, D

Barnby, LS

Bartke, J

Barton, RA

Betev, L

Bialkowska, H

Billmeier, A

Blyth, CO

Bock, R

Boimska, B

Bormann, C

Brady, FP

Brockmann, R

Brun, R

Buncic, P

Caines, HL

Carr, LD

Cebra, D

Cooper, GE

Cramer, JG

Cristinziani, M

Csato, P

Dunn, J

Eckardt, V

Eckhardt, F

Ferguson, MI

Fischer, HG

Flierl, D

Fodor, Z

Foka, P

Freund, P

Friese, V

Fuchs, M

Gabler, F

Gal, J

Ganz, R

Gazdzicki, M

Geist, W

Gladysz, E

Grebieszkow, J

Günther, J

Harris, JW

Hegyi, S

Henkel, T

Hill, LA

Hümmler, H

Igo, G

机构：

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

[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA USA

[3] Univ Birmingham, Birmingham, W Midlands, England

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

[5] CERN, Geneva, Switzerland

[6] Inst Nucl Phys, Krakow, Poland

[7] Gesell Schwerionenforsch GSI, Darmstadt, Germany

[8] Univ Calif Davis, Davis, CA 95616 USA

[9] Joint Inst Nucl Res, Dubna, Russia

[10] Univ Frankfurt, Fachbereich Phys, D-6000 Frankfurt, Germany

[11] Kent State Univ, Kent, OH 44242 USA

[12] Univ Calif Los Angeles, Los Angeles, CA USA

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

[14] Max Planck Inst Phys, D-80805 Munich, Germany

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

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

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

[18] Yale Univ, New Haven, CT USA

[19] Rudjer Boskovic Inst, Zagreb, Croatia

来源：

PHYSICS LETTERS B | 1999年 / 459卷 / 04期

基金：

匈牙利科学研究基金会; 英国工程与自然科学研究理事会; 美国国家科学基金会;

关键词：

D O I：

10.1016/S0370-2693(99)00673-5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present first data on event-by-event fluctuations in the average transverse momentum of charged particles produced in Pb + Pb collisions at the CERN SPS. This measurement provides previously unavailable information allowing sensitive tests of microscopic and thermodynamic collision models and to search for fluctuations expected to occur in the vicinity of the predicted QCD phase transition. We find that the observed variance of the event-by-event average transverse momentum is consistent with independent particle production modified by the known two-particle correlations due to quantum statistics and final state interactions and folded with the resolution of the NA49 apparatus. For two specific models of non-statistical fluctuations in transverse momentum limits are derived in terms of fluctuation amplitude. We show that a significant part of the parameter space for a model of isospin fluctuations predicted as a consequence of chiral symmetry restoration in a non-equilibrium scenario is excluded by our measurement. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

引用

页码：679 / 686

页数：8

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