Measurement of theoscillation frequency using dimuon data incollisions at
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We present a measurement of the mass difference md of the two Bd0 mass eigenstates. We use a flavor tagging method based on the lepton charge, in a sample of events with two muons at low transverse momentum. The sample corresponds to an integrated luminosity of 90 pb-1 collected by the Collider Detector at Fermilab. The result obtained is md=0.5030.064(stat)0.071(syst) ps-1. 1999 The American Physical Society.