Chemical freezeout in relativistic A+A collisions: is it close to the QGP?

  • Preliminary experimental data for particle number ratios in the collisions of Au+Au at the BNL AGS (11A GeV/c) and Pb+Pb at the CERN SPS (160A GeV/c) are analyzed in a thermodynamically consistent hadron gas model with excluded volume. Large values of temperature, T = 140 185 MeV, and baryonic chemical potential, µb = 590 270 MeV, close to the boundary of the quark-gluon plasma phase are found from fitting the data. This seems to indicate that the energy density at the chemical freezeout is tremendous which would be indeed the case for the point-like hadrons. However, a self-consistent treatment of the van der Waals excluded volume reveals much smaller energy densities which are very far below a lowest limit estimate of the quark-gluon plasma energy density. PACS number(s): 25.75.-q, 24.10.Pa

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Author:Mark I. GorensteinORCiDGND, Horst StöckerORCiDGND, Granddon D. Yen, Shin Nan Yang, Walter GreinerGND
Document Type:Preprint
Date of Publication (online):2005/12/19
Year of first Publication:1997
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2005/12/19
Tag:Quark-Gluon-Plasma; Zustandsgleichung; chemisches Ausfrieren; van der Waals
chemical freezeout; equation of state; quark-gluon plasma; van der Waals
Source:J.Phys.G24:1777-1784,1998, Version 2
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoDeutsches Urheberrecht