Author(s): The SLD Collaboration Presenting author: Tracy Usher Corresponding author's e-mail: usher@slac.stanford.edu Title of the presentation: Improved Measurement of the Probability for Gluon Splitting into b-bbar in Z^0 Decays Link to the full paper: Session of 1st preference: 1-Hard High Energy QCD and Structure Functions Session of 2nd preference: 4-Heavy Flavor   Abstract   We have measured gluon splitting into bottom quarks, g->b-bbar, in hadronic Z^0 decays collected by SLD between 1996 and 1998. The analysis was performed by looking for secondary bottom production in 4-jet events of any primary flavor. 4-jet events were identified, and in each event a topological vertex-mass technique was applied to the two jets closest in angle in order to identify them as b or bbar jets. The upgraded CCD-based vertex detector gives very high B-tagging efficiency, especially for B hadrons with the low energies typical of this process. We measured the rate of g->b-bbar production per hadronic event, g_b-bbar, to be [2.44+-0.59 (stat.) +-0.34 (syst.)]x10^-3.