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Manuscript Title: ERATO: event generator for four-fermion production at LEP2 energies and beyond.
Authors: C.G. Papadopoulos
Program title: ERATO
Catalogue identifier: ADFA_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 101(1997)183
Programming language: Fortran.
Computer: HP workstation.
Operating system: UNIX.
Keywords: Particle physics, Elementary, Event simulation, Four-fermion processes, Trilinear gauge coupling, Event generator.
Classification: 11.2.

Nature of problem:
A very important fraction of the events produced at high-energy e+e- collisions corresponds to four-fermion final states. Important physical issues, like the measurement of the mass of the W boson and the study of the trilinear gauge couplings (TGC), are based on the analysis of these four-fermion final states. Other production processes, like associated Higgs production or R-parity violating SUSY particle production, lead also to the same final states. It is therefore indispensable to have a rather accurate description of the four-fermion production, including tree-order signal and background contributions as well as the leading part of the higher order corrections.

Solution method:
The construction of an event generator is of course the desired solution to the problem of calculating all four-fermion processes at high energies. To this end, we have calculated all relevant matrix elements, using a variation of the spinor technique which is more efficient in writing and testing the corresponding Fortran codes. A multichannel approach on phase space generation has been used in order to deal with the problem of the multipeak structure of the integrated function. Higher order corrections are systematically introduced and the new physics effects described effectively by the trilinear gauge couplings are considered. ERATO provides the computational framework which enables us to study in a systematic way four-fermion physics at high-energy e+e- colliders.