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Centrality and system size dependence of multiplicity fluctuations in nuclear collisions at 158A GeV

  • C. Alt
  • , T. Anticic
  • , B. Baatar
  • , D. Barna
  • , J. Bartke
  • , L. Betev
  • , H. Białkowska
  • , C. Blume
  • , B. Boimska
  • , M. Botje
  • , J. Bracinik
  • , R. Bramm
  • , P. Bunčić
  • , V. Cerny
  • , P. Christakoglou
  • , P. Chung
  • , O. Chvala
  • , J. G. Cramer
  • , P. Csató
  • , P. Dinkelaker
  • V. Eckardt, D. Flierl, Z. Fodor, P. Foka, V. Friese, J. G'l, M. Gaździcki, V. Genchev, G. Georgopoulos, E. Gładysz, K. Grebieszkow, S. Hegyi, C. Höhne, K. Kadija, A. Karev, D. Kikola, M. Kliemant, S. Kniege, V. I. Kolesnikov, E. Kornas, R. Korus, M. Kowalski, I. Kraus, M. Kreps, A. Laszlo, R. Lacey, M. Van Leeuwen, P. Lévai, L. Litov, B. Lungwitz, M. Makariev, A. I. Malakhov, M. Mateev, G. L. Melkumov, A. Mischke, M. Mitrovski, J. Molnár, St Mrówczyński, V. Nicolic, G. Pálla, A. D. Panagiotou, D. Panayotov, W. Peryt, A. Petridis, M. Pikna, J. Pluta, D. Prindle, F. Pühlhofer, R. Renfordt, C. Roland, G. Roland, M. Rybczyński, A. Rybicki, A. Sandoval, N. Schmitz, T. Schuster, P. Seyboth, F. Siklér, B. Sitar, E. Skrzypczak, M. Slodkowski, G. Stefanek, R. Stock, C. Strabel, H. Ströbele, T. Susa, I. Szentpétery, J. Sziklai, M. Szuba, P. Szymanski, V. Trubnikov, D. Varga, M. Vassiliou, G. I. Veres, G. Vesztergombi, D. Vranić, A. Wetzler, Z. Włodarczyk, A. Wojtaszek, I. K. Yoo, J. Zimńyi
  • Goethe University Frankfurt
  • Ruder Boskovic Institute
  • Joint Institute for Nuclear Research
  • Wigner Research Centre for Physics
  • Institute of Nuclear Physics
  • CERN
  • Institute of Nuclear Chemistry and Technology, Warsaw
  • National Institute for Subatomic Physics
  • Comenius University
  • National and Kapodistrian University of Athens
  • Stony Brook University
  • Charles University
  • University of Washington
  • Max Planck Institute for Physics (Werner Heisenberg Institute)
  • GSI Helmholtz Centre for Heavy Ion Research
  • Jan Kochanowski University in Kielce
  • Bulgarian Academy of Sciences
  • Warsaw University of Technology
  • Atomic Physics Department
  • University of Marburg
  • Massachusetts Institute of Technology
  • University of Warsaw
  • Pusan National University

Research output: Contribution to journalArticlepeer-review

75 Scopus citations

Abstract

The centrality and system size dependence of multiplicity fluctuations of charged particles produced in nuclear collisions at 158A GeV was studied by the NA49 Collaboration. Centrality selected Pb+Pb collisions, semicentral C+C and Si+Si collisions as well as inelastic p+p interactions were analyzed. The number of projectile participants determined on an event-by-event basis was used to characterize the collision centrality. The scaled variance of the multiplicity distribution obtained in the forward rapidity region (1.1<yc.m.<2.6) shows a significant increase toward peripheral collisions. The results are similar for negatively and positively charged particles and about 50% larger for all charged particles. String-hadronic models of nuclear reactions without the fusion process do not reproduce the rise of fluctuations from central toward peripheral collisions. The measured centrality dependence can be reproduced in superposition models with the assumption of contributions from target participants to particle production in the forward hemisphere or in string models with fusion.

Original languageEnglish
Article number064904
JournalPhysical Review C - Nuclear Physics
Volume75
Issue number6
DOIs
StatePublished - Jun 6 2007

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