The B0-B̅ 0 oscillation frequency has been measured with a sample of 23×106 BB̅ pairs collected with the BABAR detector at the PEP-II asymmetric B Factory at SLAC. In this sample, we select events in which both B mesons decay semileptonically and use the charge of the leptons to identify the flavor of each B meson. A simultaneous fit to the decay time difference distributions for opposite- and same-sign dilepton events gives Δmd = 0.493±0.012(stat)±0.009(syst)ps-1.
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