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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.
Comment: 3 pages, 4 figures, presented at the PHOTON 99 conference
Final results on a CMOS 0.18 µm front-end chip for silicon strips readout are summarized and preliminary results on time measurement are discussed. The status of the next version in 0.13 µm is briefly presented.
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