Upsilon(1S)->gamma+f2'(1525); f2'(1525)->K0sK0s decays
Abstract
We report on a study of exclusive radiative decays of the Upsilon(1S) resonance into a final state consisting of a photon and two K0s candidates. We find evidence for a signal for Upsilon(1S)->gamma f2'(1525); f2'(1525)->K0sK0s, at a rate (4.0+/-1.3+/-0.6)x10-5, consistent with previous observations of Upsilon(1S)->gamma f2'(1525); f2'(1525)->K+K-, and isospin. Combining this branching fraction with existing branching fraction measurements of Upsilon(1S)->gamma f2'(1525) and J/psi->gamma f2'(1525), we obtain the ratio of branching fractions: B(Upsilon(1S)->gamma f2'(1525))/B(J/psi->gamma f2'(1525))=0.09+/-0.02, approximately consistent with expectations based on soft collinear effective theory.
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