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Lattice gauge theory techniques have recently achieved sufficient accuracy to permit a determination of the strong coupling constant from the 1P-1S splitting in the charmonium system, with all systematic errors estimated quantitatively. The present result is ₌ₒ (5 GeV) =0. 1740. 012, or equivalently, ₌ₒ^ (4) =160-₃₇^+47 MeV (MS denotes the modified minimal subtraction scheme).
El-Khadra et al. (Mon,) studied this question.
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