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Proceedings of 12th International Conference on B-Physics at Hadron Machines — PoS(BEAUTY 2009)
Results of the latest CLEO contribution to bottomonium spectroscopy is presented, the confirmation of the η b ( 1 S 0 ) ground state of bottomonium in the radiative decay ϒ(3S) → γη b . The bottomonium hyperfine splitting is determined to be ∆M h f (1S) = 68.5 ± 6.6 ± 2.0 MeV and the branching fraction B(ϒ(3S) → γη b ) = (7.1 ± 1.8 ± 1.1) × 10 −4 , assuming Γ(η b ) = 10 MeV. These results are in good agreement with those reported by BaBar.doi:10.22323/1.088.0037 fatcat:u6p6ikbltncyfcwu66ftepjilu