CERN Heavy Ion Forum

by (CERN)

Thursday 31 Jan 2002, 15:00 → 17:00 Europe/Zurich

13/2-005 (CERN)

1. Daniele Treleani (Trieste University & INFN, Trieste) Multiparton scatterings in proton-nucleus collisions at the LHC Multiparton interactions are a unique tool to obtain a detailed information on the hadron structure, allowing one to explore the hadron in different points contemporarily and with various hard probes. Particularly interesting is the case of hadron-nucleus collisions, both for the substantial enhancement of rates and for the additional handle on the interaction dynamics, provided by the dependence on the atomic mass number of the process. Various advantages in measuring the hadronic double parton distributions with N-A collisions are outlined, while the inclusive transverse spectrum of the produced partons represents a stringent test of the interaction mechanism. 2. Krzysztof Redlich (CERN TH & Wroclaw University) String dynamics versus statistical hadronization in p-p and heavy ion collisions We formulate the kinetic equation for the time evolution and equilibration of abelian charged particles in the strongly interacting medium. The results are then applied to describe particle yields obtained in p-p, p-A and heavy ion collisions. The observable is proposed to distinguish between statistical hadronization and string dynamics. 3. Eugene Zabrodin (University of Tuebingen) Analysis of particle production in ultra-relativistic heavy ion collisions within a two-source statistical model The experimental data on hadron yields and ratios in central lead-lead and gold-gold collisions at SPS and RHIC energies, respectively, are analysed within a two-source statistical model of an ideal hadron gas. A comparison with the standard thermal model is given. The two sources, which can reach the chemical and thermal equilibrium separately and may have different temperatures, particle and strangeness densities, and other thermodynamic characteristics, 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.

Organiser(s): Yiota Foka, Urs Wiedemann / EP Division