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Evidence for the eta(b)(1S) Meson in Radiative Y(2S) Decay

Abstract:

We have performed a search for the ηb(1S) meson in the radiative decay of the Υ(2S) resonance using a sample of 91.6×106 Υ(2S) events recorded with the BABAR detector at the PEP-II B factory at the SLAC National Accelerator Laboratory. We observe a peak in the photon energy spectrum at Eγ=609.3-4.5+4.6(stat)±1.9(syst)MeV, corresponding to an ηb(1S) mass of 9394.2-4.9+4.8(stat)±2.0(syst)MeV/c2. The branching fraction for the decay Υ(2S)→γηb(1S) is determined to be [3.9±1.1(stat)-0.9+1.1(syst)]...

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Publication status:
Published

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Journal:
PHYSICAL REVIEW LETTERS
Volume:
103
Issue:
16
Chapter number:
ARTN 161801
Publication date:
2009-10-16
DOI:
EISSN:
1079-7114
ISSN:
0031-9007
URN:
uuid:b30d811e-eacd-4975-8f78-372b4506f822
Source identifiers:
211362
Local pid:
pubs:211362

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