Particle number fluctuations in high energy nucleus-nucleus collisions from microscopic transport approaches

  • Event-by-event multiplicity fluctuations in nucleus-nucleus collisions are studied within the HSD and UrQMD transport models. The scaled variances of negative, positive, and all charged hadrons in Pb+Pb at 158 AGeV are analyzed in comparison to the data from the NA49 Collaboration. We find a dominant role of the fluctuations in the nucleon participant number for the final hadron multiplicity fluctuations. This fact can be used to check di erent scenarios of nucleus-nucleus collisions by measuring the final multiplicity fluctuations as a function of collision centrality. The analysis reveals surprising e ects in the recent NA49 data which indicate a rather strong mixing of the projectile and target hadron production sources even in peripheral collisions. PACS numbers: 25.75.-q,25.75.Gz,24.60.-k

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Author:Volodymyr P. Konchakovski, Stéphane HausslerGND, Mark I. GorensteinORCiDGND, Elena L. BratkovskayaORCiDGND, Marcus BleicherORCiDGND, Horst StöckerORCiDGND
Document Type:Preprint
Date of Publication (online):2005/12/05
Year of first Publication:2005
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2005/12/05
Tag:Hadron; Modell; Partikelzahlschwankung; Transport
mixing of hadron sources; particle number fluctuations; transport models
Institutes:Physik / Physik
Wissenschaftliche Zentren und koordinierte Programme / Frankfurt Institute for Advanced Studies (FIAS)
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoDeutsches Urheberrecht