Geodesic
Influence of singularities of the amplitude on the behavior of the differential scattering cross section
Teoretičeskaâ i matematičeskaâ fizika, Tome 30 (1977) no. 3, pp. 322-332 Cet article a éte moissonné depuis la source Math-Net.Ru

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Using the unitarity condition and analytical properties of the amplitude in the $z=\cos\vartheta$ variable, it is shown that the main contribution in the elastic scattering into the forward and the backward light cone at high energy is due to the parts of the amplitude which are determined by singularities in the right and left semi-planes of the $z$-plane, respectively. 
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     title = {Influence of singularities of the amplitude on the behavior of the differential scattering cross section},
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G. L. Rcheulishvili; A. P. Samokhin. Influence of singularities of the amplitude on the behavior of the differential scattering cross section. Teoretičeskaâ i matematičeskaâ fizika, Tome 30 (1977) no. 3, pp. 322-332. http://geodesic.mathdoc.fr/item/TMF_1977_30_3_a3/

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