Hadron production in relativistic nuclear collisions: thermal hadron source or hadronizing quark-gluon plasma?

Abstract. Measured hadron yields from relativistic nuclear collisions can be equally well understood in two physically distinct models, namely a static thermal hadronic source vs. a time-dependent, nonequilibrium hadronization off a quark-gluon plasma droplet. Due to the time-dependent particle evap... Ausführliche Beschreibung

1. Person: Spieles, C.
Weitere Personen: Stöcker, H.; Greiner, C.
Quelle: in The European physical journal Vol. 2 (1998), p. 351-358
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Format: Online-Artikel
Sprache: English
Veröffentlicht: 1998
Beschreibung: Online-Ressource
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Anmerkung: Copyright: Copyright 1998 Springer-Verlag Berlin Heidelberg
Zusammenfassung: Abstract. Measured hadron yields from relativistic nuclear collisions can be equally well understood in two physically distinct models, namely a static thermal hadronic source vs. a time-dependent, nonequilibrium hadronization off a quark-gluon plasma droplet. Due to the time-dependent particle evaporation off the hadronic surface in the latter approach the hadron ratios change (by factors of $\lessapprox 5$ ) in time. Final particle yields reflect time averages over the actual thermodynamic properties of the system at a certain stage of the evolution. Calculated hadron, strangelet and (anti-)cluster yields as well as freeze-out times are presented for different systems. Due to strangeness distillation the system moves rapidly out of the $T$ , $\mu_q$ plane into the $\mu_s$ -sector. Strangeness to baryon ratios $f_s=1-2$ prevail during a considerable fraction (50%) of the time evolution (i.e. $\Lambda$ -droplets or even $\Xi^-$ -droplets form the system at the late stage: The possibility of observing this time evolution via two-particle correlations is discussed). The observed hadron ratios require $T_c\approx 160$ MeV and $B^{1/4}\gtrapprox 200$ MeV. If the present model is fit to the extrapolated hadron yields, metastable hypermatter can only be produced with a probability $p<10^{-8}$ for $A \ge 4$ .
ISSN: 1434-6052

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