Measurement of Correlated B Quark Cross Sections at Cdf

Using data collected during the 1992-1993 collider run at Fermilab, CDF has made measurements of correlated b quark cross section where one b is detected from the lepton from semileptonic decay and the second b is detected with secondary vertex techniques. We report on measurements of the cross section as a function of the momentum of the second b and as a function of the azimuthal separation of the two b quarks, for transverse momentum of the initial b quark greater than 15 GeV. The vertex reconstruction techniques are valid over a large range in transverse momentum, starting at a minimum of 10 GeV. Results are compared to QCD predictions.