Lifetimes, mixing and CP asymmetry of B mesons with the BABAR detector

During its first year of operation at the PEP-II asymmetric B factory at SLAC, the BABAR detector has collected 23 millions of pairs. The study of the time-dependent CP-violating asymmetry in neutral B decays to , and is presented here. The amplitude of the asymmetry is measured to be: sin2β = 0.34 7 ± 0.20(stat) ± 0.05(syst). Results on B lifetimes and oscillations are also reported.