Preliminary Measurements of the Time Mixing with Kaon and Charge Dipole Tags

We report two preliminary measurements of the time dependence of B 0 d B 0 d mixing using novel techniques with a sample of 150,000 hadronic Z 0 decays collected by the SLD experiment at the SLC. B decay v ertices are reconstructed inclusively with a topological technique and the B hadron avor at production is determined by exploiting the large left-right forward-backward asymmetry of Z 0 ! b b decays in combination with a jet charge technique. Two methods are used to tag the B avor at decay. The rst uses the charge of kaons attached to the B decay v ertex and identied with the Cherenkov Ring Imaging Detector. The second measurement is based on the construction of a charge dipole of the topological vertices to separate the B 0 d =B 0 d decays by exploiting the B ! D cascade charge structure. The measurement o f the oscillation frequency yields m d = 0 : 58 0:07(stat)0:08(syst) p s 1 and 0:56 0:08(stat)0:04(syst) ps 1 for the kaon and dipole tags respectively.