Fluctuations of theK/πratio in nucleus-nucleus collisions: Statistical and transport models

2008/11/30 by M. I. Gorenstein, M. Hauer, V. P. Konchakovski +2
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-th

paper · pdf · doi:10.1103/physrevc.79.024907

published as Phys.Rev.C79:024907,2009 · 26 pages, 5 eps figures, to be published in Phys. Rev. C

arxiv created 2009/01/28 · openalex publication_date 2009/02/26 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

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/\ensuremathπ ratio fluctuations in central Au+Au (or Pb+Pb) collisions from low Super Proton Synchrotron up to top Relativistic Heavy Ion Collider 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.

Citations

• Multiplicity fluctuations in Au+Au collisions at ultrarelativistic energies
• Statistical ensembles with fluctuating extensive quantities
• Relativistic Hadron-Hadron Collisions in the Ultra-Relativistic Quantum Molecular Dynamics Model (UrQMD)
• Searching for the critical point of QCD: Theoretical benchmark calculations
• Probability distributions in statistical ensembles with conserved charges
• Bose–Einstein condensation of pions in high multiplicity events
• Multiplicity fluctuations in relativistic nuclear collisions: Statistical model versus experimental data