Recently derived spectral function sum rules have been used to obtain mass ratios, assuming that the spectral functions are dominated by certain low-lying states. The strangeness-carrying resonance mass ratio is investigated and the predicted value is found to depend critically upon the ratio FK/Fπ. Using the experimental value FK/Fπ = 1.28 ± 0.02, it is found that [Formula: see text]. On the other hand, from the input value [Formula: see text] we get [Formula: see text].
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Moffat et al. (1967) studied this question.
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