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@PHDTHESIS{Kresan:49378,
      author       = {Kresan, Dmytro},
      title        = {{T}itel {E}vent-by-event fluctuations of the particle yield
                      ratios in heavy-ion collisions at 20 - 158 {AG}e{V}},
      school       = {Johann Wolfgang Goethe Universität Frankfurt},
      type         = {Dissertation},
      reportid     = {GSI-2013-01007},
      pages        = {138},
      year         = {2010},
      note         = {Dissertation, Johann Wolfgang Goethe Universität
                      Frankfurt, 2010},
      abstract     = {Non-statistical event-by-event fluctuations are considered
                      as an important signal for the critical endpoint of the QCD
                      phase diagram. Event-by-event fluctuations of different
                      observables are thus investigated in detail in current
                      experiments but are also an important observable to be
                      studied at the future CBM experiment at FAIR. In this work
                      we present the energy and centrality dependence of
                      event-by-event fluctuations of particle yield ratios
                      measured by the NA49 experiment in Pb+Pb collisions at 20 -
                      158 AGeV. Systematic studies of the influence of the dE/dx
                      resolution on the particle identification and the centrality
                      bin size were performed. Results can be compared to
                      event-by-event fluctuations measured by NA49 for different
                      observables such as <pt> or the mean charged particle
                      multiplicity. Main results of these studies are an increase
                      of absolute value of the dynamical particle ratio
                      fluctuations with decreasing centrality for all considered
                      ratios, saturation of the K/Pi and K/p ratio fluctuations
                      for peripheral Pb + Pb collisions at 158A GeV and scaling of
                      the energy and centrality dependences of the p/Pi ratio
                      fluctuations with NpNPi. The measured energy and centrality
                      dependences of the K/Pi and K/p ratio fluctuations scale
                      with NK in a different way. The saturation of the mentioned
                      ratios fluctuations was attributed to the development of
                      pronounced spike at zero in the eventwise ratio
                      distributions, which, as was shown by Monte Carlo
                      simulations, influence the measured fluctuations in the very
                      peripheral Pb + Pb collisions at 158A GeV. In future, the
                      CBM experiment at FAIR will investigate the intermediate
                      region of the QCD phase diagram in great detail searching
                      for the first order phase transition line and the expected
                      critical endpoint. It is therefore important to closely
                      investigate its sensitivity towards particle ratio
                      fluctuations in Au+Au collisions at 10-45 AGeV beam energy.
                      Detailed simulation studies will be presented. As an outcome
                      of these feasibility studies we conclude that the CBM
                      experiment will be able to provide high quality data on the
                      subject of the event-by-event flucutations of particle yield
                      ratios with sensitivity in the order of $1\%.$},
      keywords     = {Dissertation (GND)},
      cin          = {CBM / CBM@FAIR},
      cid          = {I:(DE-Ds200)CBM-20080821OR102 / I:(DE-Ds200)Coll-FAIR-CBM},
      pnm          = {532 - Nuclear and Quark Gluon Matter (NQM) (POF2-532)},
      pid          = {G:(DE-HGF)POF2-532},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:hebis:30-76422},
      url          = {https://repository.gsi.de/record/49378},
}