A NEW TECHNIQUE FOR DETERMINING CHARGE AND MOMENTUM OF ELECTRONS AND POSITRONS USING CALORIMETRY AND SILICON TRACKING

We describe the application of a new method for the determination of charge and track parameters for electrons and positrons in both central (pseudo-rapidity 1) 0 ! jjj ! 1:2) and forward (pseudo-rapidity 1:2 ! jjj ! 2:3) regions at CDF. The method uses the shower centroid position in the calorimeter in combination with a track in the inner silicon vertex detector. The use of the central tracking chamber is not required. A comparison of the shower centroid in the calorimeter, with the extrapolated silicon vertex detector track determines the electron sign. This technique has been used to measure the W asymmetry in CDF in regions beyond the pseudo-rapidity coverage of the central tracking chamber. Application to other Physics analyses in current collider experiments at the Tevatron and in future high luminosity experiments at the LHC are discussed