Measurement of B Decays to phi K gamma
Abstract
We search for the decays B- -> phi K- gamma and B0bar -> phi K0bar gamma in a data sample of 228 million BBbar pairs collected at the Upsilon(4S) resonance with the BaBar detector. We measure the branching fraction B(B- -> phi K- gamma) = (3.5 +/- 0.6 +/- 0.4) x 10-6 and set an upper limit B(B0bar -> phi K0bar gamma) < 2.7 x 10-6 at the 90% confidence level. We also measure the direct CP asymmetry in B- -> phi K- gamma, ACP = (-26 +/- 14 +/- 5)%. The uncertainties are statistical and systematic, respectively.
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