dorsal/arxiv
View SchemaHydrodynamical assessment of 200 AGeV collisions
| Authors | Ekkard Schnedermann, Ulrich Heinz |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9402018 |
| URL | https://arxiv.org/abs/nucl-th/9402018 |
| DOI | 10.1103/PhysRevC.50.1675 |
| Journal | Phys.Rev.C50:1675-1683,1994 |
Abstract
We are analyzing the hydrodynamics of 200 A GeV S+S collisions using a new approach which tries to quantify the uncertainties arising from the specific implementation of the hydrodynamical model. Based on a previous phenomenological analysis we use the global hydrodynamics model to show that the amount of initial flow, or initial energy density, cannot be determined from the hadronic momentum spectra. We additionally find that almost always a sizeable transverse flow deve- lops, which causes the system to freeze out, thereby limiting the flow velocity in itself. This freeze-out dominance in turn makes a distinction between a plasma and a hadron resonance gas equation of state very difficult, whereas a pure pion gas can easily be ruled out from present data. To complete the picture we also analyze particle multiplicity data, which suggest that chemical equilibrium is not reached with respect to the strange particles. However, the over- population of pions seems to be at most moderate, with a pion chemical potential far away from the Bose divergence.
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"abstract": "We are analyzing the hydrodynamics of 200 A GeV S+S collisions using a new\napproach which tries to quantify the uncertainties arising from the specific\nimplementation of the hydrodynamical model. Based on a previous\nphenomenological analysis we use the global hydrodynamics model to show that\nthe amount of initial flow, or initial energy density, cannot be determined\nfrom the hadronic momentum spectra. We additionally find that almost always a\nsizeable transverse flow deve- lops, which causes the system to freeze out,\nthereby limiting the flow velocity in itself. This freeze-out dominance in turn\nmakes a distinction between a plasma and a hadron resonance gas equation of\nstate very difficult, whereas a pure pion gas can easily be ruled out from\npresent data. To complete the picture we also analyze particle multiplicity\ndata, which suggest that chemical equilibrium is not reached with respect to\nthe strange particles. However, the over- population of pions seems to be at\nmost moderate, with a pion chemical potential far away from the Bose\ndivergence.",
"arxiv_id": "nucl-th/9402018",
"authors": [
"Ekkard Schnedermann",
"Ulrich Heinz"
],
"categories": [
"nucl-th",
"hep-ph"
],
"doi": "10.1103/PhysRevC.50.1675",
"journal_ref": "Phys.Rev.C50:1675-1683,1994",
"title": "Hydrodynamical assessment of 200 AGeV collisions",
"url": "https://arxiv.org/abs/nucl-th/9402018"
},
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