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Evidence for the η[subscript b](1S) Meson in Radiative Υ(2S) Decay

Author(s)
Zhao, M.; Yamamoto, R. K.; Sciolla, Gabriella; Henderson, Shawn Wesley; Dujmic, Denis; Fisher, Peter H; Taylor, Frank E; Spitznagel, Michael A; ... Show more Show less
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Alternative title
Evidence for the ηb(1S) Meson in Radiative Υ(2S) Decay
Terms of use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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Abstract
We have performed a search for the η[subscript b](1S) meson in the radiative decay of the Υ(2S) resonance using a sample of 91.6×10[superscript 6] 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 E[subscript γ]=609.3[subscript -4.5][superscript +4.6](stat)±1.9(syst)  MeV, corresponding to an η[subscript b](1S) mass of 9394.2-4.9[superscript +4.8](stat)±2.0(syst)  MeV/c[superscript 2]. The branching fraction for the decay Υ(2S)→γη[subscript b](1S) is determined to be [3.9±1.1(stat)[subscript -0.9][superscript +1.1](syst)]×10[superscript -4]. We find the ratio of branching fractions B[Υ(2S)→γη[subscript b](1S)]/B[Υ(3S)→γη[subscript b](1S)]=0.82±0.24(stat)[subscript -0.19][superscript +0.20](syst).
Date issued
2009-10
URI
http://hdl.handle.net/1721.1/54711
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
BABAR Collaboration et al. “Evidence for the η[subscript b](1S) Meson in Radiative Υ(2S) Decay.” Physical Review Letters 103(16)(2009): 161801(7). © The American Physical Society.
Version: Final published version
ISSN
0031-9007

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