The Silicon Vertex is the CDF online tracker which will reconstruct
2D tracks using hit positions measured by the Silicon Vertex Detector and
Central Outer Chamber tracks found by the eXtremely Fast Tracker.  The
precision measurement of the track impact parameter will allow triggering on
events containing B hadrons.  This will allow the investigation of several
important problems in B physics, like CP violation and B_s mixing, and to
search for new heavy particles decaying to bb-bar.