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Manuscript Title: WOPPER: a Monte Carlo event generator for W off-shell pair production including higher order electromagnetic radiative corrections.
Authors: H. Anlauf, J. Biebel, A. Himmler, P. Manakos, T. Mannel, W. Schonau, H.D. Dahmen
Program title: WOPPER, VERSION 1.0
Catalogue identifier: ACTH_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 79(1994)487
Programming language: Fortran.
Computer: IBM RS/6000-520.
Operating system: AIX, MVS.
RAM: 80K words
Word size: 32
Keywords: Particle physics, Elementary, Event simulation, Qed, Radiative corrections, W pair production, W decays, Multiphoton radiation.
Classification: 11.2, 11.4.

Nature of problem:
Higher order leading logarithmic QED radiative corrections to W pair production and decay at high energy e+e- colliders, including finite width of the W's.

Solution method:
Monte Carlo event generation.

Restrictions:
The matrix elements for the hard subprocess contain only the resonant contributions to e+e- -> (W+W-) -> 4 fermions in the Born approximation. The final state fermions from the W decays are generated at the parton level.

Running time:
Approx 1 ms/event, depending on the energy and cuts. The test run at LEP 200 energies took approximately 19 CPU seconds on an IBM RS/6000-520 running AIX, and 11 CPU seconds on an IBM 3090 running MVS.