Fluctuations of the $K/π$ Ratio in Nucleus-Nucleus Collisions: Statistical and Transport Models

Details Fluctuations of the $K/π$ Ratio in Nucleus-Nucleus Collisions: Statistical and Transport Models Fluctuations of the $K/π$ Ratio in Nucleus-Nucleus Collisions: Statistical and Transport Models

2008-11-19

arxiv.org/abs/0811.3089v2

Phys.Rev.C79:024907,2009

Physics

Nuclear Physics

Nuclear Theory

26 pages, 5 eps figures, to be published in Phys. Rev. C

Scientific paper

10.1103/PhysRevC.79.024907

Event-by-event fluctuations of the kaon to pion number ratio in nucleus-nucleus collisions are studied within the statistical hadron-resonance gas model (SM) for different statistical ensembles and in the Hadron-String-Dynamics (HSD) transport approach. We find that the HSD model can qualitatively reproduce the measured excitation function for the $K/\pi$ ratio fluctuations in central Au+Au (or Pb+Pb) collisions from low SPS up to top RHIC energies. Substantial differences in the HSD and SM results are found for the fluctuations and correlations of the kaon and pion numbers. These predictions impose a challenge for future experiments.

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