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Observation of the bottomonium ground state in the decay Upsilon(3S)->gamma eta(b)
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BaBar Collaboration (Including:
). (2008) Observation of the bottomonium ground state in the decay Upsilon(3S)->gamma eta(b). Physical Review Letters, Vol.101 (No.7). article no.071801. doi:10.1103/PhysRevLett.101.071801 ISSN 0031-9007.Research output not available from this repository.
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Official URL: http://dx.doi.org/10.1103/PhysRevLett.101.071801
Abstract
We report the results of a search for the bottomonium ground state eta(b)(1S) in the photon energy spectrum with a sample of (109 +/- 1) million of Upsilon(3S) recorded at the Upsilon(3S) energy with the BABAR detector at the PEP-II B factory at SLAC. We observe a peak in the photon energy spectrum at E-gamma=921.2(-2.8)(+2.1)(stat)+/- 2.4(syst) MeV with a significance of 10 standard deviations. We interpret the observed peak as being due to monochromatic photons from the radiative transition Upsilon(3S)->gamma eta(b)(1S). This photon energy corresponds to an eta(b)(1S) mass of 9388.9(-2.3)(+3.1)(stat)+/- 2.7(syst) MeV/c(2). The hyperfine Upsilon(1S)-eta(b)(1S) mass splitting is 71.4(-3.1)(+2.3)(stat)+/- 2.7(syst) MeV/c(2). The branching fraction for this radiative Upsilon(3S) decay is estimated to be [4.8 +/- 0.5(stat)+/- 1.2(syst)]x10(-4).
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Physical Review Letters | ||||
Publisher: | American Physical Society | ||||
ISSN: | 0031-9007 | ||||
Official Date: | 15 August 2008 | ||||
Dates: |
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Volume: | Vol.101 | ||||
Number: | No.7 | ||||
Number of Pages: | 7 | ||||
Page Range: | article no.071801 | ||||
DOI: | 10.1103/PhysRevLett.101.071801 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published |
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