A new measurement of ηb (1S) from Υ (3S) radiative decay at CLEO

Sean Dobbs*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Using CLEO data, we report on the confirmation of the ηb (1 s0) ground state of bottomonium in the radiative decay Υ (3s) rarr; γηb We determine its mass to be M(ηb) = 9391.8 ± 6.6 ± 2.1 MeV, which corresponds to the hyperfine splitting ΔMhf (1S) = 68.5 ± 6.6 ± 2.0 MeV, and the branching fraction ℬ (Υ(3s) → γηb= (7.1 ± 1.8 ± 1.1) × 10 -4 These results agree with those previously reported by BaBar.

Original languageEnglish (US)
Title of host publicationHadron 2009 - Proceedings of the XIII International Conference on Hadron Spectroscopy
Number of pages5
StatePublished - 2010
Externally publishedYes
Event13th International Conference on Hadron Spectroscopy, Hadron 2009 - Tallahassee, FL, United States
Duration: Nov 29 2009Dec 4 2009

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Other13th International Conference on Hadron Spectroscopy, Hadron 2009
Country/TerritoryUnited States
CityTallahassee, FL


  • Bottomonium spectroscopy
  • Quarkonia
  • Upsilons

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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