PROGRAM SUMMARY
Title of program:
APACIC++, version 1.0
Catalogue identifier:
ADNE
Ref. in CPC:
134(2001)223
Distribution format: tar gzip file
Operating system: UNIX, LINUX, VMS
Number of lines in distributed program, including test data, etc:
29710
Keywords:
Elementary particle physics, Event simulation, Standard model,
Gauge bosons, Higgs-boson physics, e+e- annihilations,
Jet production, Parton shower.
Programming language used: C++, Fortran
Nature of physical problem:
With rising energies, the final state in high-energy electron
positron-annihilations becomes increasingly complex. The number of jets
as well as the number of observable particles, leptons, hadrons and
photons, increases drastically and prevents any analytical prediction of
the full final state. In addition, the transformation of the partons of
perturbative quantum field theory into the experimentally observable
hadrons is so far not understood on a quantitative level. Both
obstacles prevent any attempt to bring the fundamental theory in direct
contact with the final states by analytical methods.
Method of solution:
APACIC++ produces complete e+e- -events on a level suitable for direct
comparison with experiment. The events are generated using Monte-Carlo
methods and by dividing their simulation into well-separated steps.
APACIC++ concentrates in its event generation on the hard subprocess
producing jets and the subsequent parton shower describing their
evolution. For the production of jets, interfaces to various matrix
element generators are provided. The fragmentation into hadrons and
their subsequent decays are left for well-defined models encoded in
already existing Fortran programs. Suitable interfaces are
supplemented.