Measurement of B Decays to phi K gamma
Abstract
We measure the branching fraction of the radiative B- decay B(B- -> phi K- gamma) = (3.46 +/- 0.57+0.39-0.37) 10-6, and set an upper limit on the radiative B0 decay B(B0 -> phi K0 gamma) < 2.71 10-6 at 90% confidence level. We also measure the direct CP asymmetry of the B- -> phi K- gamma mode ACP = (-26.4 +/- 14.3 +/- 4.8)%. The uncertainties are statistical and systematic, respectively. These measurements are based on 207 1/fb of data collected at the Y4S resonance with the BABAR detector.
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