Geodesic
Analytic structure of the $3\to 3$ forward amplitude
Teoretičeskaâ i matematičeskaâ fizika, Tome 35 (1978) no. 1, pp. 3-13
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A convenient formalism is proposed for detailed study of the analytic structure of the $3\to 3$ forward amplitude based on the general principles of quantum field theory. At any point of the physical region of each of the eight channels the amplffude is reduced to one of 96 generalized retarded functions. Primitive analyticity domains and coincidence properties of these functions needed for carrying out the program of analytic continuation are found. 
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V. P. Pavlov. Analytic structure of the $3\to 3$ forward amplitude. Teoretičeskaâ i matematičeskaâ fizika, Tome 35 (1978) no. 1, pp. 3-13. http://geodesic.mathdoc.fr/item/TMF_1978_35_1_a0/

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