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

Gorenstein, Mark I.; Stoecker, Horst; Yen, Granddon D.; Yang, Shin Nan; Greiner, Walter

doi:10.1088/0954-3899/24/9/010

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

Mark I. Gorenstein
(
- Frankfurt U. and
- Tel Aviv U. and
- Taiwan, Natl. Taiwan U.
)
,
Horst Stoecker
(
- Frankfurt U. and
- Tel Aviv U.
)
,
Granddon D. Yen
(
- Taiwan, Inst. Phys.
)
,
Shin Nan Yang
(
- Taiwan, Natl. Taiwan U.
)
,
Walter Greiner
(
- Frankfurt U.
)

Nov, 1997

11 pages

Published in:

J.Phys.G 24 (1998) 1777-1784

e-Print:

nucl-th/9711055 [nucl-th]

DOI:

10.1088/0954-3899/24/9/010

View in:

pdf

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Abstract:

Preliminary experimental data for particle number ratios in the collisions of Au+Au at the BNL AGS (11

A

GeV/

c

) and Pb+Pb at the CERN SPS (160

A

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,

\mu_b=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.

Note:

RevTeX, 11 pages, 3 figures Report-no: aps1997nov24_002

nucleus nucleus: nuclear reaction
relativistic
gold
lead
thermodynamics
hadron: gas
quark gluon: plasma
temperature
potential: chemical
energy: density

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