arXiv:hep-ph/0206173·v1·High Energy Physics — Phenomenology
Strangeness production in heavy ion collisions at SPS and RHIC within two-source statistical model
Zhong-Dao Lu (1,2)🇨🇳 · Amand Faessler (2)🇩🇪 · C. Fuchs (2)🇩🇪 · E. Zabrodin (2,3) ((1) China Institute of Atomic Energy, Beijing, China; (2) Institut fuer Theoretische Physik, Universitaet Tuebingen, Germany; (3) Institute for Nuclear Physics, Moscow State University, Russia)🇩🇪
Abstract
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.
Comments: Talk at "Strange Quarks in Matter" Conference (Strangeness'2001), September 2001, Frankfurt a.M., Germany