Evidence for the η[subscript b](1S) Meson in Radiative Υ(2S) Decay
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Aubert-2009-Evidence for the eta.pdf
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Author(s)
Zhao, M.
Yamamoto, R. K.
Sciolla, Gabriella
Henderson, Shawn Wesley
Dujmic, Denis
Fisher, Peter H
Taylor, Frank E
Spitznagel, Michael A
Alternative Title
Evidence for the ηb(1S) Meson in Radiative Υ(2S) Decay
Date Issued
October 2009
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
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).
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevLett.103.161801
