A silicon tracker for a Super-B factory and future e+e- colliders.

• Giovani Calderini (LPNHE Paris)

The experience acquired during the seven-year running of present B-factories is at the basis of a Silicon tracker design for a future high-luminosity e+e- machine presently under study for B mesons production. The constraints which are imposed by the new accelerator are far more stringent with respect to the systems presently in operation, with a big impact on the detector solutions. In this seminar I'll start from the experience of the Silicon Vertex Tracker of the BaBar experiment at SLAC to discuss the main limitations of present detectors when extrapolated to the conditions of the new accelerator, in particular in terms of occupancy, radiation budget and material. I will show some of the solutions which are under evaluation and their impact on physics performance. I will also present some results of tests on APSEL chips, the first prototypes of a new CMOS monolithic active-pixel sensor developed by groups from Pisa and Pavia, which could be the heart of the inner trackers in this and other future detectors.