Precision measurements assess fine structure in quarkonium states, indicating issues in spin-dependent potential models.
The CUSB-II detector at CESR has yielded precision measurements of branching ratios for electric dipole transitions in the Υ system, and of the masses and the fine structure splittings of the Xb(2P) states. Comparison of htese measurements with those from the charmonium system indicate that problems exist with the present descriptions of the spin-dependent potential, and that more precision measurements are sorely needed.
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Lee et al. (1993) studied this question.
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