Measurement of the B0-B-0 oscillation frequency with inclusive dilepton events

Phys Rev Lett. 2002 Jun 3;88(22):221803. doi: 10.1103/PhysRevLett.88.221803. Epub 2002 May 20.

Abstract

The B0-B-0 oscillation frequency has been measured with a sample of 23 x 10(6) BB- 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 deltamd = 0.493+/-0.012(stat)+/-0.009(syst) ps-1.