Simultaneous measurement of the B0 meson lifetime and mixing frequency with B0→D*-l+νl decays -: art. no. 072002

We measure the B-0 lifetime tau(B)(0) and the B-0-(B) over bar (0) oscillation frequency Deltam(d) with a sample of approximately 14000 exclusively reconstructed B-0-->D(*-)l(+)nul signal events, selected from 23 million B (B) over bar pairs recorded at the Y(4S) resonance with the BABAR detector at the Stanford Linear Accelerator Center. The decay position of the other B is determined with the remaining tracks in the event, and its b-quark flavor at the time of decay is determined with a tagging algorithm that exploits the correlation between the flavor of the b quark and the charges of its decay products. The lifetime and oscillation frequencies are measured simultaneously with an unbinned maximum-likelihood fit that uses, for each event, the measured difference in decay times of the two B mesons (Deltat), the calculated uncertainty on Deltat, the signal and background probabilities, and b-quark tagging information for the other B. The results are tau(B)(0)=(1.523(-0.023)(+0.024)+/-0.022) ps and Deltam(d)=(0.492+/-0.018+/-0.013) ps(-1). The statistical correlation coefficient between tau(B)(0) and Deltam(d) is -0.22.