Measurement of B Decays to phi K gamma

Details Measurement of B Decays to phi K gamma Measurement of B Decays to phi K gamma

2006-11-21

arxiv.org/abs/hep-ex/0611037v1

Phys.Rev.D75:051102,2007

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages, 6 postscript figures, submitted to Physical Review D Rapid Communications

Scientific paper

10.1103/PhysRevD.75.051102

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, A_CP = (-26 +/- 14 +/- 5)%. The uncertainties are statistical and systematic, respectively.

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