dorsal/arxiv
View SchemaHadron production in relativistic nuclear collisions: thermal hadron source or hadronizing quark-gluon plasma?
| Authors | C. Spieles, H. Stoecker, C. Greiner |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9704008 |
| URL | https://arxiv.org/abs/nucl-th/9704008 |
| DOI | 10.1007/s100520050145 |
| Journal | Eur.Phys.J.C2:351-358,1998 |
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 $<\approx 5$) 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 HBT correlations is discussed). The observed hadron ratios require $T_c\approx 160 MeV$ and $B^{1/4}>\approx 200 MeV$. If the present model is fit to the extrapolated hadron yields, metastable hypermatter can only be produced with a probability $p< 10^{-8}$ for $A \ge 4$.
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"abstract": "Measured hadron yields from relativistic nuclear collisions can be equally\nwell understood in two physically distinct models, namely a static thermal\nhadronic source vs.~a time-dependent, nonequilibrium hadronization off a\nquark-gluon plasma droplet. Due to the time-dependent particle evaporation off\nthe hadronic surface in the latter approach the hadron ratios change (by\nfactors of $\u003c\\approx 5$) in time. Final particle yields reflect time averages\nover the actual thermodynamic properties of the system at a certain stage of\nthe evolution. Calculated hadron, strangelet and (anti-)cluster yields as well\nas freeze-out times are presented for different systems. Due to strangeness\ndistillation the system moves rapidly out of the T, $\\mu_q$ plane into the\n$\\mu_s$-sector. Strangeness to baryon ratios f_s=1-2 prevail during a\nconsiderable fraction (50%) of the time evolution (i.e. $\\Lambda$-droplets or\neven $\\Xi^-$-droplets form the system at the late stage: The possibility of\nobserving this time evolution via HBT correlations is discussed). The observed\nhadron ratios require $T_c\\approx 160 MeV$ and $B^{1/4}\u003e\\approx 200 MeV$. If\nthe present model is fit to the extrapolated hadron yields, metastable\nhypermatter can only be produced with a probability $p\u003c 10^{-8}$ for $A \\ge 4$.",
"arxiv_id": "nucl-th/9704008",
"authors": [
"C. Spieles",
"H. Stoecker",
"C. Greiner"
],
"categories": [
"nucl-th"
],
"doi": "10.1007/s100520050145",
"journal_ref": "Eur.Phys.J.C2:351-358,1998",
"title": "Hadron production in relativistic nuclear collisions: thermal hadron source or hadronizing quark-gluon plasma?",
"url": "https://arxiv.org/abs/nucl-th/9704008"
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