CDF and D0

There is already a very active B physics program at the CDF detector at the Tevatron. The B meson lifetime measurements, fig. 7, are already competetive with those of the combined LEP experiments. This proves that it is possible to extract B physics from the hostile experimental environment of the hadron colliders. Both CDF [9] and D0 [10] are hoping to exploit the Tevatron upgrade (RUN II in 1999) to study CP violation in the B-system.

    

Figure 8: Longitudinal View of the CDF II Tracking System. Figure 7: A comparison of CDF and LEP B meson lifetime measurements.

CDF are proposing a new tracking system for Run II, fig. 8. At large radii they will have a central outer tracker (COT) of an open drift chamber design. Inside this component there is a silicon inner tracker compromising of two components: a micro-vertex detector (SVX II) at very small radii and two additional layers of silicon at intermediate radii. The current forward calorimetry is going to be replaced with a new scintillating tile plug calorimeter. New chambers will be added to the current muon system to close gaps in the azimuthal acceptance and the forward acceptance will be improved. The trigger will also be upgraded to allow track finding at level-1 and the ability to trigger on large impact parameter tracks at level-2.

A major element of the D0 upgrade is their new inner tracking system which will be located insides a new 2 Tesla superconducting solenoid. It will consist of an inner silicon vertex detector, surrounded by eight superlayers of scintillating fibre tracker. In the forward region, on the face of the end calorimeter cryostats, and in the central region, located between the solenoid and the inner radius of the calorimeter cryostat, a scintillator based pre-shower detector will be installed. The trigger upgrades will include tracking triggers at level-1 and an upgraded level-2 muon triggers.