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Abstract
Partial-wave s-singularity of the production amplitude is analyzed in the cases of pi + N yields 2 pi + N and 2 pi + N yields 2 pi + N. It is shown that the complex singularities of the fourthorder diagram coincide completely with those obtained from the corresponding pole diagram. Although the left-hand and right-hand singularities simultaneously appear on some region of the s-t plane, they are shown to be separated unambigrously. Detailed discussions about more general diagrams are also made and similar results are obtained. (auth)
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