HEAVY QUARK PRODUCTION AND DECAY: t, b, AND ONIA

This paper summarizes a variety of recent results on heavy quark production and decay. Considerable progress has been made by CDF and DØ in measuring top quark production and decay properties. The top quark mass been measured with an uncertainty that is less than 3%, a relative precision that is better than has been achieved for other quarks. Measurements of the top production and decay properties are consistent with the Standard Model predictions, but are generally limited in precision by the small number of top quark events in the present data samples. ALEPH and CLEO have measured the branching ratio for the flavor changing neutral current decay b → sγ and find good agreement with the Standard Model. Measurements of b-quark production cross sections in pp̄ collisions by CDF and DØ and in ep collisions by H1 continue to show discrepancies between theory and experiment. CDF and DELPHI have measured the b-quark fragmentation fractions with better accuracy than previous measurements. Finally, measurements of charmonium production by DØ, E771, and L3 are consistent with predictions of the color octet model.