CP violation studies with BaBar (sin 2β, sin 2α and direct CPV searches)

摘要

We present the searches for direct CP violation in charmless two-body B decays, quasi two-body B decays and radiative penguin decays B → k~*γ, using a sample of 22.7 million B(B-bar) events collected with the BABAR detector at the PEP-II collider. No evidence for direct CP violation is found and 90% confidence level limits are reported. A larger sample of 33 million B(B-bar) events is used for a measurement of time-dependent CP-violating asymmetries in neutral B mesons decays to several CP eigenstates. We measure sin2β = 0.59 ± 0.14(stat) ± 0.05(syst), which constitutes an observation of CP violation in the B~0 meson system at the 4.1σ level. Results from a study of CP violation in the decay B~0 to π~+π~- are also presented.