Sa Ben-Hao

LUCIAE 3.0: A new version of a computer program for the Firecracker Model and rescattering in relativistic heavy-ion collisions

LUCIAE is a Monte Carlo program that, connected to FRITIOF, implements both the Firecracker Model (FCM), a possible mechanism for collective multi-gluon emission from the colour fields of interacting strings, and the reinteraction of the final state hadrons in relativistic heavy ion collisions. This paper includes a brief presentation of the dynamics of LUCIAE with an emphasis on the new features in this version, as well as a description of the program, (C) 1999 Elsevier Science B.V.

Increase of effective string tension and production of strange particles

Abstract The increase of effective string tension as a result of the hard gluon kinks on a string is investigated using a parametrization form. In this form the effective string tension increasing with energies in hadron-hadron collisions is due to the mini-jet (gluon) production in the collisions. The data of the energy dependence of the strange quark suppression factor in hh collisions are very well reproduced with this mechanism. Meanwhile, the experimental phenomena of approximate energy independence of the strange quark suppression factor in e + e − -annihilations are discussed.

Production of minijets (gluons) and strangeness enhancement in pA and AA collisions at relativistic energies

The idea that effective string tension increases as a result of the hard gluon kinks on a string is applied to study the strange particle production in proton-nucleus and nucleus-nucleus collisions. It is found that the effective string tension increases with the increase of centrality and mass of the colliding system as a consequence of the minijet (gluon) production stemming from the collective string-string interaction. This mechanism leads to strangeness enhancement in pA and AA collisions through the enhanced production of the strange quark pairs from the color field of strings. We discuss different roles played by this mechanism and rescattering of the final state hadrons in the production of strange particles and compare our results with experimental data.

Dynamical features of medium energy heavy ion collision processes

A semiclassical dynamical simulation for medium and highenergy heavy ion collisions is presented and used to discuss in detail the features of evolution for 12C(25GeV; b = 0.0fm)+63 Cu reaction. From the calculated results it is shown that the model proposed can give a reasonable picture of the compression, expansion and fragmentation processes of the system in heavy ion reaction.

Net charge fluctuation and string fragmentation

We present simulation results of net charge fluctuation in

Energy dependence of string fragmentation function and meson production

Au+Au

Δ-scaling and information entropy in ultra-relativistic nucleus-nucleus collisions

collisions at

Correlations between conditional moments might not necessarily imply evidence of a phase transition in a disassembly of hot nuclei

\sqrt{s_{nn}}

Rapidity, Transverse Mass Distributions and Nuclear Stopping in(14.6 AGeV/c) Si+Au Reactions

=130 GeV from a dynamic model, JPCIAE. The calculations are done for the quark-gluon phase before hadronization, the pion gas, the resonance pion gas from

Disassembly of hot nuclei and relevant phase transition

\rho