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[Licence| Download | New Version Template] acbk_v3_0.tar.gz(1544 Kbytes)
Manuscript Title: The Monte Carlo program KORALZ, for the lepton or quark pair production at LEP/SLC energies - from version 4.0 to version 4.04.
Authors: S. Jadach, B.F.L. Ward, Z. Was
Program title: KORALZ, version 4.04
Catalogue identifier: ACBK_v3_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 124(2000)233
Programming language: Fortran.
Operating system: UNIX, HP-UX 10.2.
RAM: 1M words
Word size: 32
Keywords: Particle physics, Elementary, Event simulation, Radiative corrections, Heavy lepton tau, Monte carlo simulation, Electrodynamics quantum, Spin polarization, Electroweak theory, Anomalous couplings.
Classification: 11.2.

Subprograms used:
Cat Id Title Reference
ADKY_v1_0 GenLib, version 2.0 CPC 124(2000)238
ADKZ_v1_0 TTGlib, version 2.0 CPC 124(2000)243

Nature of problem:
Spin polarization of the tau in the process e+e- -> tau+tau-(etagamma), tau+- -> X+- is used as an important data point for precise tests of the standard electroweak theory. The effects due to QED bremsstrahlung and apparatus efficiency have to be subtracted from the data. The program may be applied also to the production of u, d, s, c, b quarks and neutrinos after appropriate redefinition of the coupling constants and masses. It may be used, as well, to simulate the muon pair production process. The precision of the program in the case of quarks and electron neutrino is restricted. Certain classes of anomalous couplings can be included for tau, q and nu final states.

Solution method:
The Monte Carlo simulation of the combined tau production and decay process is used to calculate the spin effects and effects of radiative corrections, including hard bremsstrahlung, simultaneously. Any experimental cut and apparatus efficiency may easily be introduced by rejecting some of the generated events.

The incoming e+- and outgoing tau+- may have only longitudinal polarizations. The total centre-of-mass energy is restricted to 240 GeV. The high precision of the program is assured only in the region of the Z, where interference of bremsstrahlung from initial and final states can be neglected.

Unusual features:
The distribution file includes the code for the programs GengLib, version 2.0 (Comput. Phys. Commun. 124(2000)238) and TTGlib, version 2.0 (Comput. Phys. Commun. 124(2000)243).