The Dط upgrade

The DØ detector is undergoing a major upgrade to prepare for Run II with the Main Injector at the Fermilab collider. Key elements of the upgrade include a new, magnetic tracking system containing a silicon vertex detector and scintillating fiber outer tracker inside a 2 T field. The upgrades will increase the physics reach of the DØ experiment in several areas, including the study of the physics of the b-quark. In particular, simulation studies show that a measurement of sin 2β can be made with an uncertainty of order 0.15, and that by fully reconstructing decays of the Bs, values of xs≤20 can be resolved.