Author/Authors :
Abulencia، نويسنده , , A. and Errede، نويسنده , , D. and Gerberich، نويسنده , , H. and Junk، نويسنده , , T. and Kasten، نويسنده , , M. and Levine، نويسنده , , S. and Mokos، نويسنده , , R. and Pitts، نويسنده , , K. and Rogers، نويسنده , , E. and Veramendi، نويسنده , , G. and Azzurri، نويسنده , , P. and Donati، نويسنده , , S. and Dittmann، نويسنده , , J.R. and Hewamanage، نويسنده , , S. and Krumnack، نويسنده , , N. and Wilson، نويسنده , , J.S. a، نويسنده ,
Abstract :
The CDF II eXtremely Fast Tracker (XFT) is the trigger processor which reconstructs charged particle tracks in the CDF II central outer tracking chamber. The XFT tracks are also extrapolated to the electromagnetic calorimeter and muon chambers and are associated to electromagnetic clusters and muon stubs to generate trigger electron and muon candidates. The steady increase of the Tevatron instantaneous luminosity and the resulting higher occupancy of the chamber demanded an upgrade of the original system, which performed tracking only in the transverse plane of the chamber and was consequently affected by a significant level of fake tracks. In the upgraded XFT, tracking is reinforced by using additional data from the stereo layers of the chamber to reduce the level of fake tracks and to perform three-dimensional track reconstruction. A review of this upgrade is presented.
Keywords :
CDF , Online track processor , XFT , trigger
