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Observation of the Hadronic Transitions chi_b1,2 (2P) --> omega Upsilon(1S)

D. Cronin-Hennessy·CLEO Collaboration
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Abstract

The CLEO Collaboration has made the first observations of hadronic transitions among bottomonium (b-bbar) states other than the dipion transitions among upsns states. In our study of Y(3S) decays, we find a significant signal for Y(3S) -> gamma omega Y(1S) that is consistent with radiative decays Y(3S) -> gamma chi_b1,2(2P), followed by chi_b1,2(2P) -> omega Y(1S). The branching ratios we obtain are B(chi_b1(2P) -> omega Y(1S)) = (1.63 +0.35-0.31 +0.16-0.15)% and B(chi_b2(2P) -> omega Y(1S)) = (1.10 +0.32-0.28 +0.11-0.10)%, in which the first error is statistical and the second is systematic.

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D. Cronin-Hennessy, CLEO Collaboration. 2003-11-20. Observation of the Hadronic Transitions chi_b1,2 (2P) --> omega Upsilon(1S). https://arxiv.org/abs/hep-ex/0311043

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