Flavour kinetics in an expanding quark-gluon plasma
1988; Elsevier BV; Volume: 484; Issue: 3-4 Linguagem: Inglês
10.1016/0375-9474(88)90315-6
ISSN1873-1554
AutoresH.W. Barz, Bengt Friman, J. Knoll, H. Schulz,
Tópico(s)Cold Atom Physics and Bose-Einstein Condensates
ResumoA phenomenological model for the expansion of a quark-gluon plasma is presented and applied to ultra-relativistic nucleus-nucleus collisions. The flavour kinetics is described by rate equations allowing the abundances of the different constituents of the system to be out of equilibrium. The basic constituents are the quarks and gluons in the plasma phase and hadrons in the hadronic phase. Besides ordinary kinetic processes within the two phases (inelastic collisions), we construct a model for the confinement mechanism which is based on the string phenomenology of hadronization. The latter aspect constitutes the novel and essential part of the paper. Abundances of the various hadrons have been calculated for a baryon-poor and a baryon-rich scenario. The results show that during the hadronization process, the original quark content is roughly doubled. The resulting hadron abundances are found to depend on the hadronization mechanism, while the subsequent hadronic reactions do not have a significant effect on the final hadronic abundances. We find a K−π− ratio as much as a factor 6 larger than in pp̄ collisions.
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