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Hyperfine splitting and the experimental candidates for η_b(2S)

Predictions for the hyperfine splitting of 2S bottomonia are compared with the two recent experimental candidates for the η_b(2S). The smaller splitting of the Belle state is consistent with unquenched lattice QCD computations, many potential models, and a model-independent relation which works well for charmonia. The larger splitting for the state extracted from CLEO data is inconsistent with most predictions.

preprint2013arXivOpen access
T. J. Burns
hep-exhep-ph
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T. J. Burns

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