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texto impreso
The requirements of causality and finite range lead to analytic expressions for theS-matrix in ?N resonant waves. The singularities in the complex energy plane are obtained. From them it is easy to calculate the mass and width of the resonances.[...]texto impreso
It is shown that theS-matrix of a highly absorptive resonant wave is dominated by a factor called outer factor. As an application an analytic expression for ?N S-matrix in S_(31) wave is found.
