Strangeness production in heavy ion collisions at SPS and RHIC within two-source statistical model

The experimental data on hadron yields and ratios in central Pb + Pb and Au + Au collisions at SPS and RHIC energies, respectively, are analysed within a two-source statistical model of an ideal hadron gas. These two sources represent the expanding system of colliding heavy ions, where the hot central fireball is embedded in a larger but cooler fireball. The volume of the central source increases with rising bombarding energy. Results of the two-source model fit to RHIC experimental data at midrapidity coincide with the results of the one-source thermal model fit, indicating the formation of an extended fireball, which is three times larger than the corresponding core at SPS.

[1]  P. Braun-Munzinger,et al.  Hadron production in Au - Au collisions at RHIC , 2001, hep-ph/0105229.

[2]  H. Stöcker,et al.  Transition to resonance-rich matter in heavy-ion collisions at RHIC energies , 2001 .

[3]  A. Faessler,et al.  Equation of state of resonance-rich matter in the central cell in heavy-ion collisions at s = 200 A GeV , 2000, hep-ph/0010172.

[4]  S. Bass,et al.  Local equilibrium in heavy-ion collisions: Microscopic analysis of a central cell versus infinite matter , 2000, nucl-th/0011011.

[5]  T. Ho,et al.  Suggesting a di-omega dibaryon search in heavy ion collision experiments , 2000 .

[6]  S. Bass,et al.  Local equilibrium in heavy ion collisions: Microscopic model versus statistical model analysis , 1999, hep-ph/9906548.

[7]  J. Cleymans,et al.  Chemical and thermal freezeout parameters from 1-A/GeV to 200-A/GeV , 1999, nucl-th/9903063.

[8]  P. Braun-Munzinger,et al.  Chemical equilibration in Pb+Pb collisions at the SPS , 1999, nucl-th/9903010.

[9]  N. Xu,et al.  Thermal analysis of hadron multiplicities from relativistic quantum molecular dynamics , 1998, nucl-th/9811011.

[10]  M. Gorenstein,et al.  The analysis of particle multiplicities in Pb+Pb collisions at CERN SPS within hadron gas models , 1998, nucl-th/9808012.

[11]  J. Rafelski,et al.  Chemical nonequilibrium and deconfinement in 200{ital A} GeV sulphur induced reactions , 1998, hep-ph/9806386.

[12]  S. Bass,et al.  Local Thermal and Chemical Equilibration and the Equation of State in Relativistic Heavy Ion Collisions , 1998, nucl-th/9810036.

[13]  C. Bohm,et al.  Baryon and antibaryon production in lead-lead collisions at 158 A GeV/c , 1998 .

[14]  Kapusta,et al.  Chemical equilibration of partons in high-energy heavy-ion collisions? , 1993, Physical review. D, Particles and fields.

[15]  J. Rafelski.  Strange anti-baryons from quark-gluon plasma , 1991 .

[16]  E. Fermi.  High Energy Nuclear Events , 1950 .