Geodesic
Does the $u$ channel in the $t$ plane influence the behavior of the forward differential scattering cross section at high energies?
Teoretičeskaâ i matematičeskaâ fizika, Tome 28 (1976) no. 2, pp. 147-156 
A. A. Logunov; M. A. Mestvirishvili; G. L. Rcheulishvili; A. P. Samokhin. Does the $u$ channel in the $t$ plane influence the behavior of the forward differential scattering cross section at high energies?. Teoretičeskaâ i matematičeskaâ fizika, Tome 28 (1976) no. 2, pp. 147-156. http://geodesic.mathdoc.fr/item/TMF_1976_28_2_a0/
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     author = {A. A. Logunov and M. A. Mestvirishvili and G. L. Rcheulishvili and A. P. Samokhin},
     title = {Does the $u$~channel in the $t$~plane influence the behavior of the forward differential scattering cross section at high energies?},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {147--156},
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     url = {http://geodesic.mathdoc.fr/item/TMF_1976_28_2_a0/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

On the basis of unitarity and analyticity with respect to $z=\cos\theta$ it is shown that $t$-channel singularities make the main contribution to the forward differential elastic scattering cross section at high energies.

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