Abstract
The BABAR detector, at the PEP-II asymmetric B Factory at SLAC collected a sample of 32 million B B ̄ pairs whilst operating at energies near the γ (4 S ) resonance between October 1999 and May 2001. A study of time-dependent CP -violating asymmetries in events where one neutral B meson is fully reconstructed in a final state containing charmonium produced the measurement sin 2 β = 0.59 ± 0.14 (stat) ± 0.05 (syst), which constitutes an observation of CP violation in the B 0 meson system at the 4σ level. Also presented are preliminary results from a study of CP violation in the decays b 0 → π + π − and B 0 → K + π − .
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