Measurements of Time-Dependent CP Violation in Radiative B Decays at BaBar

The authors present measurements of the CP-violation parameters S and C for the radiative decays B0 → π0KS0γ and B0 → ηKS0γ; for B → ηKγ they also measure the branching fractions and for B+ → ηK+γ the time-integrated charge asymmetry Ach. The data, collected with the BABAR detector at the SLAC National Accelerator Laboratory, represent 467 x 106 B(bar B) pairs produced in e+e- annihilation at the PEP-II collider. In this summary they present an updated measurement of the time-dependent CP asymmetry in B0 → π0KS0γ decay mode and the first measurement of the time-dependent CP asymmetry in B0 → ηKS0γ decay mode. Hadronic corrections in B0 → π0KS0γ decay mode might permit S to be as large as ± 0.1. Such corrections and NP effects could depend on m(π0KS0), so they split the data into two parts: the K*(892) region with 0.8 < m(π0KS0) < 1.0 GeV/c2 and the non-K*(892) region with 1.1 < m(π0KS0) < 1.8 GeV/c2. They also report updated measurements of branching fractions for the decay modes B0 → ηK0γ and B+ → ηK+γ and time-integrated charge-asymmetry for B+ → ηK+γ.