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# Search results

561 records were found.

## Towards a complete $\gamma\gamma \to 4~$leptons Monte Carlo

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.

## Towards a complete $\gamma\gamma \to 4~$leptons Monte Carlo

Comment: 3 pages, 4 figures, presented at the PHOTON 99 conference

## Status on the development of front-end and readout electronics for large silicon trackers

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.