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arXiv · 1001.2238

A New Measurement of eta_b(1S) From Upsilon(3S) Radiative Decay at CLEO

Sean Dobbs
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Abstract

Using CLEO data, we report on the confirmation of the eta_b(1S0) ground state of bottomonium in the radiative decay Upsilon(3S) -> gamma eta_b. We determine its mass to be M(eta_b) = 9391.8 +- 6.6 +- 2.1 MeV, which corresponds to the hyperfine splitting Delta M_hf(1S) = 68.5 +- 6.6 +- 2.0 MeV, and the branching fraction B(Upsilon(3S) -> gamma eta_b) = (7.1 +- 1.8 +- 1.1) x 10^-4. These results agree with those previously reported by BaBar.

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Sean Dobbs. 2010-01-13. A New Measurement of eta_b(1S) From Upsilon(3S) Radiative Decay at CLEO. https://doi.org/10.1063/1.3483457

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