Latest documents http://publikationen.ub.uni-frankfurt.de/index/index/ Wed, 14 Jun 2006 12:55:58 +0200 Wed, 14 Jun 2006 12:55:58 +0200 http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/2614 We present a detailed study of chemical freeze-out in p-p, C-C, Si-Si and Pb-Pb collisions at beam momenta of 158A GeV as well as Pb-Pb collisions at beam momenta of 20A, 30A, 40A and 80A GeV. By analyzing hadronic multiplicities within the statistical hadronization model, we have studied the parameters of the source as a function of the number of the participating nucleons and the beam energy. We observe a nice smooth behaviour of temperature, baryon chemical potential and strangeness under-saturation parameter as a function of energy and nucleus size. Interpolating formulas are provided which allow to predict the chemical freeze-out parameters in central collisions at centre-of-mass energies > 4.5 GeV and for any colliding ions. Specific discrepancies between data and model emerge in particle ratios in Pb-Pb collisions at SPS between 20A and 40A GeV of beam energy which cannot be accounted for in the considered model schemes. Francesco Becattini; Jaakko Manninen; Marek Gazdzicki preprint http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/2614 Wed, 14 Jun 2006 12:55:58 +0200 http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/3744 Marek Gazdzicki; K. Iovchev; E. Okonov; T. Tymieniecka workingpaper http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/3744 Tue, 04 Oct 2005 11:06:35 +0200 http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/3886 Phase diagram of strongly interacting matter is discussed within the exactly solvable statistical model of the quark-gluon bags. The model predicts two phases of matter: the hadron gas at a low temperature T and baryonic chemical potential muB, and the quark-gluon gas at a high T and/or muB. The nature of the phase transition depends on a form of the bag mass-volume spectrum (its pre-exponential factor), which is expected to change with the muB/T ratio. It is therefore likely that the line of the 1st} order transition at a high muB/T ratio is followed by the line of the 2nd order phase transition at an intermediate muB/T, and then by the lines of "higher order transitions" at a low muB/T. Mark I. Gorenstein; Marek Gazdzicki; Walter Greiner preprint http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/3886 Mon, 26 Sep 2005 08:21:06 +0200 http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/4059 A brief history of the study of fluctuations in high energy nuclear collisions at the CERN SPS performed by NA49 is presented. The ideas and the corresponding experimental data on fluctuations are discussed from the point of view of their sensitivity to the onset of deconfinement. Marek Gazdzicki article http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/4059 Tue, 06 Sep 2005 09:53:02 +0200