dorsal/arxiv
View SchemaHadron and hadron-cluster production in a hydrodynamical model including particle evaporation
| Authors | A. Dumitru, C. Spieles, H. Stoecker, C. Greiner |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9706078 |
| URL | https://arxiv.org/abs/nucl-th/9706078 |
| DOI | 10.1103/PhysRevC.56.2202 |
| Journal | Phys.Rev.C56:2202-2209,1997 |
Abstract
We discuss the evolution of the mixed phase at RHIC and SPS within boostinvariant hydrodynamics. In addition to the hydrodynamical expansion, we also consider evaporation of particles off the surface of the fluid. The back-reaction of the evaporation process on the dynamics of the fluid shortens the lifetime of the mixed phase. In our model this lifetime of the mixed phase is <12 fm/c in Au+Au at RHIC and <6.5 fm/c in Pb+Pb at SPS, even in the limit of vanishing transverse expansion velocity. Strangeness separation occurs, especially in events (or at rapidities) with relatively high initial net baryon and strangeness number, enhancing the multiplicity of MEMOs (multiply strange nuclear clusters). If antiquarks and antibaryons reach saturation in the course of the pure QGP or mixed phase, we find that at RHIC the ratio of antideuterons to deuterons may exceed 0.3 and even anti-helium to helium>0.1. Due to fluctuations, at RHIC even negative baryon number at midrapidity is possible in individual events, so that the antibaryon and antibaryon-cluster yields exceed those of the corresponding baryons and clusters.
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"abstract": "We discuss the evolution of the mixed phase at RHIC and SPS within\nboostinvariant hydrodynamics. In addition to the hydrodynamical expansion, we\nalso consider evaporation of particles off the surface of the fluid. The\nback-reaction of the evaporation process on the dynamics of the fluid shortens\nthe lifetime of the mixed phase. In our model this lifetime of the mixed phase\nis \u003c12 fm/c in Au+Au at RHIC and \u003c6.5 fm/c in Pb+Pb at SPS, even in the limit\nof vanishing transverse expansion velocity. Strangeness separation occurs,\nespecially in events (or at rapidities) with relatively high initial net baryon\nand strangeness number, enhancing the multiplicity of MEMOs (multiply strange\nnuclear clusters). If antiquarks and antibaryons reach saturation in the course\nof the pure QGP or mixed phase, we find that at RHIC the ratio of antideuterons\nto deuterons may exceed 0.3 and even anti-helium to helium\u003e0.1. Due to\nfluctuations, at RHIC even negative baryon number at midrapidity is possible in\nindividual events, so that the antibaryon and antibaryon-cluster yields exceed\nthose of the corresponding baryons and clusters.",
"arxiv_id": "nucl-th/9706078",
"authors": [
"A. Dumitru",
"C. Spieles",
"H. Stoecker",
"C. Greiner"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.56.2202",
"journal_ref": "Phys.Rev.C56:2202-2209,1997",
"title": "Hadron and hadron-cluster production in a hydrodynamical model including particle evaporation",
"url": "https://arxiv.org/abs/nucl-th/9706078"
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