2003/07/24 by Yu. A. Tarasov, Tarasov, Yu. A.
Engineering · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Material Science and Thermodynamics #Statistical Mechanics and Entropy #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0307300
16 pages, 5 figures
openalex publication_date 2003/07/24 · arxiv created 2004/04/09 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We use quasiparticle description of deconfined matter in nuclear collisions at finite temperature and chemical potential. We assume that evolution of expanding system is isentropic. Using theoretical formulas and experimental meaning for the average multiplicity of charged and neutral particles and also of net nucleons (N-N) per unit central rapidity, we calculate the initial temperature T0, and the volume V0 for the collisions of heavy nuclei (Pb+Pb and Au+Au) at SPS and RHIC energies. At calculations we use the conservation of entropy and of number net nucleons in initial plasma stage and on the stage of phase transition at temperature Tc, where we take into account the phase of constituent quarks mq and ms. The spectra of baryons and mesons are calculated at temperature of thermal freeze-out Tf = 120 MeV. The quantitative characteristic of these spectra (for example, the normalization for baryons and mesons) are determined in the present model by initial state - quark-gluon plasma.