SIMULTANEOUS MEASUREMENT OF THE B0 MESON LIFETIME AND MIXING FREQUENCY WITH B0 -> D*- L+ NU{sub L} DECAYS

Abstract

We measure the B{sup 0} lifetime {tau}{sub B{sup 0}} and the B{sup 0}-{bar B}{sup 0} oscillation frequency {Delta}m{sub d} with a sample of approximately 14,000 exclusively reconstructed B{sup 0} {yields} D*{sup -} {ell}{sup +} {nu}{sub {ell}} signal events, selected from 23 million B{bar B} pairs recorded at the {Upsilon}(4S) resonance with the BABAR detector at the Stanford Linear Accelerator Center. The b-quark .avor of the other B at the time of decay and its decay position are determined inclusively. The lifetime and oscillation frequency are measured simultaneously with an unbinned maximum-likelihood fit that uses, for each event, the measured difference in B decay times ({Delta}t), the calculated uncertainty on {Delta}t, the signal and background probabilities, and b-quark tagging information for the other B. The preliminary results are {tau}{sub B{sup 0}} = (1.523{sub -0.023}{sup +0.024} {+-} 0.022) ps and {Delta}m{sub d} = (0.492 {+-} 0.018 {+-} 0.013) ps{sup -1}. The statistical correlation coefficient between {tau}{sub B{sup 0}} and {Delta}m{sub d} is -0.22.