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Remarks on the origin of Castillejo-Dalitz-Dyson poles

Castillejo-Dalitz-Dyson (CDD) poles are known to be connected with bound states and resonances. We discuss a new type of CDD pole associated with primitives i.e., poles of the P matrix that correspond to zeros of the D function on the unitary cut. Low's scattering equation is generalized for amplitudes with primitives. The relationship between the CDD poles and the primitives is illustrated by a description of the S-wave nucleon-nucleon phase shifts.

preprint2010arXivOpen access
M. I. Krivoruchenko
hep-phnucl-th
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M. I. Krivoruchenko

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