The CDF II Level 1 track trigger system reconstructs charged
tracks in the plane transverse to the beam direction. The track trigger
electronics uses the hit data from the 4 axial layers of the CDF II
central outer tracking chamber, and has been recently upgraded to include
the complementary information from the 3 stereo layers. Together with
the existing system it provides improved fake track rejection at Level 1.
In addition, the high resolution segment information is delivered to the
Level 2 processors, where software algorithms perform thre+ e-dimensional
stereo track reconstruction. The 3D-tracks are further extrapolated to
the electromagnetic calorimeter towers and muon chambers to generate
trigger electron and muon candidates. The invariant mass of track
pairs and track isolations are also calculated and used in the Level 2
trigger decision. We describe the hardware and software for the Level
2 part of the track trigger upgrade as well as the performance of the
new track trigger algorithms.
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Updated: Friday, 2008 February 15 10:01:40 CST automatically from input from carol picciolo