Heavy Quark Production in Z Decays

We present studies of 3-jet nal states from hadronic Z decays recorded by the SLD experiment. A comparison of the strong couplings of light, c, and b quarks is made using 3-jet rates. We have performed a detailed study of ee ! b bg nal states, in which the quark, antiquark, and gluon jets are identi ed. The gluon energy spectrum, measured over the full kinematic range, is consistent with the predictions of QCD, and we derive a limit on an anomalous chromomagnetic bbg coupling. We measure the parity violation in Z decays into b bg to be consistent with the predictions of electroweak theory and QCD, and perform new tests of Tand CP-conservation at the bbg vertex. Work supported by Department of Energy contract DE-AC03-76SF00515 (SLAC).