Studies of CP Violation at BABAR

BABAR has studied the time-dependent asymmetries in the decays B0→J/ψKS0 and B0→ψ(2S)KS0 in a data set of 9.0 fb−1 taken at the ϒ(4S) resonance. In these channels we reconstruct 168 events of which 120 are flavor tagged and used in a likelihood fit where we determine sin 2β. The flavor of the other neutral B mesons is tagged using information primarily from identified leptons and Kaons. A neural network is used to recover events without any clear Kaon or lepton signature. A preliminary result of sin 2β=0.12±0.37±0.09 is obtained.