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Upsilon(1S)->gamma+f2'(1525); f2'(1525)->K0sK0s decays

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arxiv 1101.0153 v1 pith:5R2Y6A3U submitted 2010-12-30 hep-ex

Upsilon(1S)->gamma+f2'(1525); f2'(1525)->K0sK0s decays

classification hep-ex
keywords gammaupsilonbranchingconsistentdecaysfractionk0sk0spsi-
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 f_2'(1525); f_2'(1525)->K0sK0s, at a rate (4.0+/-1.3+/-0.6)x10^{-5}, consistent with previous observations of Upsilon(1S)->gamma f_2'(1525); f_2'(1525)->K+K-, and isospin. Combining this branching fraction with existing branching fraction measurements of Upsilon(1S)->gamma f_2'(1525) and J/psi->gamma f_2'(1525), we obtain the ratio of branching fractions: B(Upsilon(1S)->gamma f_2'(1525))/B(J/psi->gamma f_2'(1525))=0.09+/-0.02, approximately consistent with expectations based on soft collinear effective theory.

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