First observation of radiative B-0 -> phi K-0 gamma decays and measurements of their time-dependent CP violation

Abstract

We report the first observation of the radiative decay B K using a data sample of 772 10 B B pairs collected at the 4S resonance with the Belle detector at the KEKB asymmetric-energy collider. We observe a signal of 37 events with a significance of 5.4 standard deviations including systematic uncertainties. The measured branching fraction is BB K 274 060 032 10 where the uncertainties are statistical and systematic, respectively. We also report the first measurements of time-dependent CP-violation parameters