# Measurement of Branching Fractions in Radiative B Decays to $\eta K \gamma$ and Search for B Decays to $\eta' K \gamma$

Abstract : We present measurements of the B->eta K gamma branching fractions and upper limits for the B->eta' K gamma branching fractions. For B->eta K+ gamma we also measure the time-integrated charge asymmetry. The data sample, collected with the BaBar detector at the Stanford Linear Accelerator Center, represents 232 million produced B B-bar pairs. The results for branching fractions and upper limits at 90% C.L. in units of 10^{-6} are: Br(B0->eta K0 gamma)=11.3+2.8-2.6+/-0.6, Br(B+->eta K+gamma)=10.0+/-1.3+/-0.5, Br(B0->eta' K0 gamma)<6.6, Br(B+->eta' K+ gamma)<4.2. The charge asymmetry in the decay B+->eta K+ gamma is Ach =-0.09+/-0.12+/-0.01. The first errors are statistical and the second systematic.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00084380
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Submitted on : Wednesday, January 17, 2007 - 10:31:35 AM
Last modification on : Wednesday, September 16, 2020 - 4:25:14 PM

### Citation

B. Aubert, R. Barate, D. Boutigny, F. Couderc, Y. Karyotakis, et al.. Measurement of Branching Fractions in Radiative B Decays to $\eta K \gamma$ and Search for B Decays to $\eta' K \gamma$. Physical Review D, American Physical Society, 2006, 74, pp.031102. ⟨10.1103/PhysRevD.74.031102⟩. ⟨in2p3-00084380⟩

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