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Manuscript Title: An event generator for the Firecracker Model and the rescattering in high energy pA and AA collisions LUCIAE version 2.0.
Authors: B.-H. Sa, A. Tai
Program title: LUCIAE VERSION 2
Catalogue identifier: ADBS_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 90(1995)121
Programming language: Fortran.
Computer: DECstation 3100.
Operating system: UNIX.
RAM: 90K words
Word size: 32
Keywords: Particle physics, Elementary, Event simulation, Monte carlo, Hadrons, Nuclei, Clusters, Collective effects, Gluon radiation, Formation time, Rescattering.
Classification: 11.2.

Nature of problem:
The experiments of relativistic pA and AA collisions reveal that high energy heavy-ion collisions have some features which can not be understood in a framework where pA and AA collisions correspond to simple superpositions of independent nucleon-nucleon collisions. The low Pt enhancement, high Pt enhancement, strangeness enhancement etc. clearly show that some collective effects are active in the relativistic pA and AA collisions. Formation of a QGP is often suggested to be a candidate for these collective effects. Could we understand those new features in the pA and AA collisions by conventional physics? The Monte-Carlo generator, LUCIAE is built in an attempt to answer this question.

Solution method:
When many strings or colour dipoles are formed in relativistic pA and AA collisions, it is natural to ask if there is some interaction between those dipoles so that they could emit gluons collectively using their common total energy density. The Firecracker Model is developed to study such a collective effect. Moreover, many hadrons are produced through hadronisation, which implies that they will interact with each other and with the surrounding cold spectator matter. The rescattering effect in the final state is also included in LUCIAE program.

Restrictions:
At very high energies (sqrt(s) in the TeV range), especially for collisions of massive nuclei, certain arrays need to be expanded to accommodate the large number of particles produced.

Running time:
Depends on the type of collision and energy. Two examples running on Alpha Work Station: 32 32 S + S p = 200 A GeV/c: ~ 15 events/min lab 32 207 S + Pb p = 200 A GeV/c: ~ 4 events/min lab