t-Channel couplings in Kaon-nucleon scattering

Hyperbolic dispersion relations are used to examine elasticKN and tintin1N amplitudes in the resonance region, and to extrapolate them to the annihilation channel. By evaluating the relations on a set of paths interior to the elastic channel physical regions, a spin separation oft-channel contributions is effected, and resonance couplings deduced. The results show clear evidence for effects attributable to exchanges withJ≦3, several of which have not previously been isolated. The special problems associated with the isoscalarS-wave states are discussed, and an estimate made of the ?-S ^* mixing angle.