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Manuscript Title: RACOONWW 1.3: a Monte Carlo program for four-fermion production at e+e- colliders.
Authors: A. Denner, S. Dittmaier, M. Roth, D. Wackeroth
Program title: RACOONWW, version 1.3
Catalogue identifier: ADRU_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 153(2003)462
Programming language: Fortran.
Computer: DEC/ALPHA, Linux PCs.
Operating system: UNIX, Linux.
RAM: 4M words
Keywords: Radiative corrections, W-pair production, Four-fermion production, Triple guage-boson couplings, Quartic gauge-boson couplings, Monte Carlo integration, Event generation, Elementary particle physics, QCD.
Classification: 11.5.

Nature of problem:
Precision calculations for W-pair production, four-fermion production, and four-fermion plus photon production in e+e- annihilation.

Solution method:
Multi-channel Monte Carlo integration of perturbatively calculated multidifferential cross sections including radiative corrections to e+e- ->4f. The code can generate weighted and unweighted events. For hadronization an interface to PYTHIA is provided.

Restrictions:
Virtual O(alpha) radiative corrections are included in double-pole approximation (DPA) only. Higher-order initial-state radiation is included via collinear structure functions in leading-logarithmic approximation. QCD corrections are included as a global multiplicative factor (1 + alphas/pi) for each hadronically decaying W boson. The external fermions are assumed to be massless. Below about 170 GeV the DPA is not applicable, and above 500 GeV contributions become numerically important that are not yet implemented in RACOONWW.

Running time:
On a DEC/ALPHA workstation the computing time for calculating 10**7 weighted events for tree-level predictions is about 2 hours. When including radiative corrections the computing time for 5 x 10**7 weighted events amounts to about 30 hours.