References
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The validity of theND −1 representation for problems withn two-particle channels and no overlap of left and right singularities can be established with the help of the theory of singular integral equations; cf. ref. (9). The asymptotic condition mentioned in ref. (9) turns out to be unnecessary.
R. L. Warnock:Bull. Am. Phys. Soc.,9, 116 (1964).
Channels with more than two particles and overlap of left and right singularities are neglected. Under certain assumptions, these problems can be treated. See, for example, ref. (11). Equation (1) may also contain Castillejo-Dalitz-Dyson poles, in general. The CDD poles have no influence on the present work; cf. ref. (12).
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Warnock, R.L. Motion of poles as a broken resonance multiplet approaches degeneracy. Nuovo Cim 32, 255–257 (1964). https://doi.org/10.1007/BF02732614
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DOI: https://doi.org/10.1007/BF02732614