Abstract
We apply Webber's QCD branching Monte Carlo model to study the properties of jets produced in upsilon decay and the nearby continuum ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ annihilations. In general, agreement between the Monte Carlo simulation and data is obtained. More baryons are produced in upsilon decay than in the continuum annihilation because there are more heavy colorless clusters in the configuration of upsilon decay. We then investigate the various decay mechanisms of t-quarkonium. The heavy-particle spectra are found to be quite different for various decay modes of t-quarkonium.
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