Latest documents http://publikationen.ub.uni-frankfurt.de/index/index/ Thu, 12 May 2005 10:40:26 +0100 Thu, 12 May 2005 10:40:26 +0100 http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/3125 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 Volodymyr P. Konchakovski; Stephane Häussler; Mark I. Gorenstein; Elena L. Bratkovskaya; Marcus Bleicher; Horst Stöcker preprint http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/3125 Mon, 05 Dec 2005 10:40:26 +0100