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Manuscript Title: UNIBAB, version 2.0: Monte Carlo event generation for large angle Bhabha scattering at LEP.
Authors: H. Anlauf, P. Manakos, T. Mannel, T. Ohl, H. Meinhard, H.-D. Dahmen
Program title: UNIBAB, Version 2.0
Catalogue identifier: ACTC_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 79(1994)466
Programming language: Fortran.
Computer: IBM 3090.
Operating system: MVS, AIX, IRIX, Ultrix.
RAM: 65K words
Word size: 32
Keywords: Particle physics, Elementary, Event simulation, Radiative corrections, Bhabha scattering, Multiphoton radiation.
Classification: 11.2.

Subprograms used:
Cat Id Title Reference
ACHB_v1_0 HEPAWK CPC 70(1992)120

Nature of problem:
Higher order leading logarithmic QED radiative corrections to large angle Bhabha scattering (e+e- -> e+e-gamma...) at Zo-energies including weak corrections.

Solution method:
Monte Carlo event generation.

Restrictions:
The program assumes dominance of the s-channel Zo-exchange contributions and does not include the interference between initial and final state radiation. Therefore, the program should only be used in the vicinity of the Zo-peak and only for not too small and not too large scattering angles (10 degrees < theta* < 170 degrees). For cross checks, the contributions of the t-channel diagrams may be switched off, so that the program effectively simulates e+e- -> mu+mu-. However, the latter mode is not very efficient.

Running time:
Strongly dependent on the energy and the chosen cuts. The test run took approximately 190 CPU seconds on an IBM 3090 under MVS, 380 CPU seconds on an IBM RS/6000-520 running AIX, 220 CPU seconds on an SGI 460 running IRIX, and 340 CPU seconds on a DECstation 5000/240 running Ultrix.