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Sign ambiguity in the K Sigma channel

Ambiguities of the signs of $N\to ΣK$ coupling constants are studied in a multichannel partial wave analysis of a large body of pion and photo-induced reactions. It is shown that the signs are not free from some ambiguities, and further experimental data are needed. Data on the reactions $π^+p\to Σ^+K^+$ and $γp\to K^+Σ^0$ define rather well the isospin 3/2 contributions to these channels. However the lack of information on polarization observables for the reactions $π^-p\to Σ^0K^0$, $π^-p\to Σ^-K^+$ and $γp\to K^0Σ^+$ does not allow us to fix uniquely the signs of $N\to ΣK$ coupling constants. As a consequence, also the contributions of nucleon resonances to these channels remain uncertain.