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Within the previously developed Dubna-Mainz-Taipei meson-exchange model, thesingularity structure of the pi N scattering amplitudes has been investigated.For all partial waves up to F waves and c.m. energies up to W = 2 GeV, theT-matrix poles have been calculated by three different techniques: analyticcontinuation into the complex energy plane, speed-plot and the regularizationmethod. For all 4-star resonances, we find a perfect agreement between theanalytic continuation and the regularization method. We also find resonancepoles for resonances that are not so well established, but in these cases thepole positions and residues obtained by analytic continuation can substantiallydiffer from the results predicted by the speed-plot and regularization methods.

Singularity structure of the pi N scattering amplitude in a meson-exchange model up to energies W < 2.0 GeV