# 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, A_CP = (-26 +/- 14 +/- 5)%. The uncertainties are statistical and systematic, respectively.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00119418
Contributor : Dominique Girod <>
Submitted on : Saturday, December 9, 2006 - 2:21:25 PM
Last modification on : Sunday, June 20, 2021 - 3:34:55 AM

### Citation

B. Aubert, M. Bona, D. Boutigny, F. Couderc, Y. Karyotakis, et al.. Measurement of B Decays to $\phi K \gamma$. Physical Review D, American Physical Society, 2007, 75, pp.051102. ⟨10.1103/PhysRevD.75.051102⟩. ⟨in2p3-00119418⟩

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