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Recently published measurements of the branching ratios β(Ψ(1S) →ƴƞс (1S)) and β(Ψ(2S) →ƴƞс (1S)) by the CLEO Collaboration are examined in the context of a potential model that includes both relativistic and one-loop QCD corrections to the quark-antiquark interaction. The prediction for the width Г (Ψ(1S) →ƴƞс (1S)) is in excellent agreement with the new data, but the prediction for Г (Ψ(2S) →ƴƞс (1S)) is too small. In an effort to understand this discrepancy, we derive an upper bound on Г (Ψ(2S) →ƴƞс (1S)) and point out its experimental value saturates this bound.

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@ 2008 The American Physical Society

DOI: 10.1103/PhysRevD.78.057501

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