dorsal/arxiv
View SchemaDirect Emission of multiple strange baryons in ultrarelativistic heavy-ion collisions from the phase boundary
| Authors | A. Dumitru, S. A. Bass, M. Bleicher, H. Stöcker, W. Greiner |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9901046 |
| URL | https://arxiv.org/abs/nucl-th/9901046 |
| DOI | 10.1016/S0370-2693(99)00805-9 |
| Journal | Phys.Lett. B460 (1999) 411-416 |
Abstract
We discuss a model for the space-time evolution of ultrarelativistic heavy-ion collisions which employs relativistic hydrodynamics within one region of the forward light-cone, and microscopic transport theory (i.e. UrQMD) in the complement. Our initial condition consists of a quark-gluon plasma which expands hydrodynamically and hadronizes. After hadronization the solution eventually changes from expansion in local equilibrium to free streaming, as determined selfconsistently by the interaction rates between the hadrons and the local expansion rate. We show that in such a scenario the inverse slopes of the $m_T$-spectra of multiple strange baryons ($\Xi$, $\Omega$) are practically unaffected by the purely hadronic stage of the reaction, while the flow of $p$'s and $\Lambda$'s increases. Moreover, we find that the rather ``soft'' transverse expansion at RHIC energies (due to a first-order phase transition) is not washed out by strong rescattering in the hadronic stage. The earlier kinetic freeze-out as compared to SPS-energies results in similar inverse slopes (of the $m_T$-spectra of the hadrons in the final state) at RHIC and SPS energies.
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"abstract": "We discuss a model for the space-time evolution of ultrarelativistic\nheavy-ion collisions which employs relativistic hydrodynamics within one region\nof the forward light-cone, and microscopic transport theory (i.e. UrQMD) in the\ncomplement. Our initial condition consists of a quark-gluon plasma which\nexpands hydrodynamically and hadronizes. After hadronization the solution\neventually changes from expansion in local equilibrium to free streaming, as\ndetermined selfconsistently by the interaction rates between the hadrons and\nthe local expansion rate. We show that in such a scenario the inverse slopes of\nthe $m_T$-spectra of multiple strange baryons ($\\Xi$, $\\Omega$) are practically\nunaffected by the purely hadronic stage of the reaction, while the flow of\n$p$\u0027s and $\\Lambda$\u0027s increases. Moreover, we find that the rather ``soft\u0027\u0027\ntransverse expansion at RHIC energies (due to a first-order phase transition)\nis not washed out by strong rescattering in the hadronic stage. The earlier\nkinetic freeze-out as compared to SPS-energies results in similar inverse\nslopes (of the $m_T$-spectra of the hadrons in the final state) at RHIC and SPS\nenergies.",
"arxiv_id": "nucl-th/9901046",
"authors": [
"A. Dumitru",
"S. A. Bass",
"M. Bleicher",
"H. St\u00f6cker",
"W. Greiner"
],
"categories": [
"nucl-th",
"hep-ph"
],
"doi": "10.1016/S0370-2693(99)00805-9",
"journal_ref": "Phys.Lett. B460 (1999) 411-416",
"title": "Direct Emission of multiple strange baryons in ultrarelativistic heavy-ion collisions from the phase boundary",
"url": "https://arxiv.org/abs/nucl-th/9901046"
},
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