Abstract
A perturbation method for the complex angular momentum poles of the multichannel S-matrix is developed. The inelastic residues of the S-matrix are also treated in a similar fashion. It is shown that the poles and residues are the second order in coupling between the channels. The closed channel Regge poles are also discussed and it is shown that their contribution in the perturbation series is finite, regardless of the asymptotic behavior of potential.
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