On determinations of the KN effective coupling constant from forward amplitudes
Review articleOpen access

AbstractWe discuss in a general way the problem of extracting the effective KNY coupling constant from data on KN forward amplitudes. In particular we investigate the impact of the so called positivity condition recently claimed by Lopez and Yndurain to give a coupling constant determination with errors comparable to those on G2πNN4π.We point out possible biases in their estimate, devise an approximation scheme related to the Padé approximation scheme free of these and perform an analysis using it.By explicit construction we show that positivity still allows a large range of coupling constants.

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