the kaon-mass splitting are both dominated by an s-wave, -f = 0, pion-pion resonance, somewhat higher than the kaon mass to ensure m^ >m s , then the relation cos(cp w + 6) = 0 must be satisfied. For small 5 2 , this is precisely the exceptional limit we have just examined.Comparison with experiment. -Presently available experimental data permit us to determine 8 0 -6 2 approximately. Inserting into Eq.(1) the values of R = 2.9±0.6 6 and cp =0.60± 0.23, 7 we obtain the inequalityThis result is compatible with other determinations of the pion phase shifts at 500 MeV. 8 We thank V. Teplitz for his help, as well as N. Cabibbo and S. Weinberg for interesting discussions.
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