Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2006-03-29
Phys.Rev.D74:031102,2006
Physics
High Energy Physics
High Energy Physics - Experiment
7 pages, 2 postscript figures. Submitted to Phys. Rev. Lett
Scientific paper
10.1103/PhysRevD.74.031102
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.
"The BABAR Collaboration
Aubert B.
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