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International Conference on the Structure and Interactions of the Photon, including the 12th International Workshop on Photon-Photon Collisions, Freiburg : Allemagne (1999)
Towards a complete $\gamma\gamma \to 4~$leptons Monte Carlo
C. Carimalo1, W. Da Silva1, F. Kapusta1

The total cross-section of the $\gamma \gamma \to 4 $ leptons process is known to have a large constant value at high energy, but a complete and exact calculation of related differential spectra does not exist yet. However a complete study of the process is important at NLC for luminosity measurements or for background estimations. We here report on our various steps in that direction, including the implementation of a first new calculation of helicity amplitudes in a Monte-Carlo generator.
1 :  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
Physique/Physique des Hautes Energies - Phénoménologie
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