Abstract
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 B s, values of x s≤20 can be resolved.
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