2004/11/30 by J. Cleymans, H. Oeschler, K. Redlich +1 · 2 citations
Physics and Astronomy · #Baryon #Baryon number #Hadron #Heavy ion #High-Energy Particle Collisions Research #Ion #Maxima #Meson #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #hep-ph #nucl-th
paper · pdf · doi:10.1016/j.physletb.2005.03.074
published as Phys.Lett. B615 (2005) 50-54 · 5 pages, 5 postscript figures, uses elsart.sty
arxiv created 2005/02/24 · openalex publication_date 2005/04/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The recently discovered sharp peak in the K+/π+ ratio in relativistic heavy-ion collisions is discussed in the framework of the statistical model. In this model a rapid change is expected as the hadronic gas undergoes a transition from a baryon-dominated to a meson-dominated gas. The transition occurs at a temperature T=140MeV and baryon chemical potential μB=410MeV corresponding to an incident energy of sNN=8.2GeV. The maximum in the Λ/π ratio is well reproduced by the statistical model, but the change in the K+/π+ ratio is much less pronounced than the one observed by the NA49 Collaboration. The calculated smooth increase of the K−/π− ratio and the shape of the Ξ−/π+ and Ω−/π+ ratios exhibiting maxima at different incident energies is consistent with the presently available experimental data. We conclude that the measured particle ratios with 20–30% deviations agree with a hadronic freeze-out scenario. These deviations seem to occur just in the transition from baryon-dominated to meson-dominated freeze-out.