Abstract
A measurement of the mass difference,Δm d , between the two physical B 0 d states has been obtained from the analysis of the impact parameter distribution of a lepton emitted at large transverse momentum (p t ) relative to the jet axis and from the analysis of the flight distance distribution of secondary vertices tagged by either a highp t lepton or an identified kaon. In the opposite hemisphere of the event, the charge of the initial quark has been evaluated using a highp t lepton, a charged kaon or the mean jet charge. With 1.7 million hadronic Z0 decays recorded by DELPHI between 1991 and 1993,Δm d is found to be: $$\Delta m_d = 0.531_{ - 0.046}^{ + 0.050} (stat.) \pm 0.078 (syst.) ps^{ - 1} .$$ .
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