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Observation of the Hadronic Transitions Chi_{b 1,2}(2P) -> omega Upsilon(1S)

H. Severini
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Abstract

The CLEO Collaboration has observed the first hadronic transition among bottomonium (b bbar) states other than the dipion transitions among vector states, Upsilon(nS) -> pi pi Upsilon(mS). In our study of Upsilon(3S) decays, we find a significant signal for Upsilon(3S) -> gamma omega Upsilon(1S) that is consistent with radiative decays Upsilon(3S) -> gamma chi_{b 1,2}(2P), followed by chi_{b 1,2} -> omega Upsilon(1S). The branching ratios we obtain are Br(chi_{b1} -> omega Upsilon(1S) = 1.63 (+0.35 -0.31) (+0.16 -0.15) % and Br(chi_{b2} -> omega Upsilon(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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H. Severini. 2003-07-15. Observation of the Hadronic Transitions Chi_{b 1,2}(2P) -> omega Upsilon(1S). https://doi.org/10.1103/physrevlett.92.222002

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