THE CDF TRIGGER SILICON VERTEX TRACKER (SVT)

The design is presented for a device presently being built to perform on line track finding and reconstruction for the CDF (Collider Detecto r at Fermilab) Silicon Vertex Detector (120k channels)[l]. This device will provide track impact parameter information for the CDF Level 2 t rigger decision, thus allowing CDF to trigger on events containing a l ong lived particle, in particular a b-quark. It will be the first devi ce with such a capability installed at a proton-antiproton collider. T he capability to separate b decays early in the trigger process is vit al to the CDF program to collect a high statistic b sample to attack t he study of CP violation in the b sector. Moreover SVT will open acces s to non-leptonic b decays like B-->pi pi.