Hadron and hadron cluster production in a hydrodynamical model including particle evaporation

  • 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 o the surface of the fluid. The back-reaction of this 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 d 12 fm/c in Au + Au at RHIC and d 6.5 fm/c in Pb + Pb at SPS, even in the limit of vanishing transverse expansion velocity. Strong separation of strangeness 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 4He/4He > 0.1. In S + Au at SPS we find only N/N H 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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Author:Adrian Bogdan DumitruGND, Christian Spieles, Horst StöckerORCiDGND, Carsten GreinerGND
ArXiv Id:http://arxiv.org/abs/nucl-th/9706078
Document Type:Preprint
Date of Publication (online):2006/01/16
Year of first Publication:1997
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2006/01/16
Tag:Kollisionen schwerer Ionen; QGP; Quark-Gluon-Plasma; RHIC; SPS
QGP; RHIC; SPS; heavy-ion collisions; quark-gluon-plasma
Source:Phys.Rev.C56:2202-2209,1997. [nucl-th/9706078]
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoDeutsches Urheberrecht