² Assuming ${\Gamma}_{{\mathit \eta}_{{b}}{(1S)}}$ = 10 MeV. Not independent of the corresponding ${{\mathit \gamma}}$ energy or mass difference measurements.

³ Obtained by analyzing CLEO III data but not authored by the CLEO Collaboration.

${{\mathit \eta}_{{b}}{(1S)}}$ MASS (MeV)

References:

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Observation of $\Upsilon(2S)\to\gamma \eta_{b}(1S)$ decay

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