Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Simulation in ALICE   ALICE, the experiment dedicated to the study of heavy ion collisions at the
LHC, uses an object-oriented framework for simulation, reconstruction and
analysis (AliRoot) based on ROOT. Here, we describe the general ALICE
simulation strategy and those components of the framework related to
simulation. Two main requirements have driven the development of the simulation
components. First, the possibility to run different transport codes with the
same user code for geometry and detector response has led to the development of
the Virtual Monte Carlo concept. Second, simulation has to provide tools to
efficiently study events ranging from low-multiplicity pp collisions to Pb-Pb
collisions with up to 80000 primary particles per event. This has led to the
development of a variety of collaborating generator classes and specific
classes for event merging.

9
The categories of this paper are: nlin
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th