FESR analysis of baryon regge exchanges in K-p→Λπ0 scattering

FESR and a fit to 5 GeV/c data are used to determine residue functions and trajectory parameters of baryon poles governing K-p→Λπ0 backward scattering. The Nsub(α) pole is found to make only a small contribution. In the dip region, all the residues are slowly varying with u and none is vanishing. Nevertheless, the dip is reproduced at the right position, resulting from destructive interference between various pole contributions. Extrapolating the obtained residues, it results that the unwanted parity partners are suppressed by the vanishing of the residues at the appropriate positive values of u. (author)