Traditionally, B physics has been the domain of e+ e- machines
operating on the Upsilon (4S) resonance or the Z0 pole.  But the UA 1
Collaboration has already shown that B physics is feasible at a hadron
collider environment (see for example Ref. [1]).  The first signal of fully
reconstructed B mesons at a hadron collider has been published by the CDF
Collaboration in 1992 [2].  CDF reconstructed a handful of B+ --> J/psi K+
events in a data sample of 2.6 pb-1 taken during the Tevatron Run 0 at the
end of the 1980's.  Since then experimental techniques improved
significantly.  Especially with the development of high precision silicon
vertex detectors, the study of B hadrons is now an established part of the
physics program at hadron colliders.