Geodesic
Analytic properties of the differential cross section of inelastic scattering
Teoretičeskaâ i matematičeskaâ fizika, Tome 25 (1975) no. 3, pp. 425-429 
G. L. Rcheulishvili; A. P. Samokhin. Analytic properties of the differential cross section of inelastic scattering. Teoretičeskaâ i matematičeskaâ fizika, Tome 25 (1975) no. 3, pp. 425-429. http://geodesic.mathdoc.fr/item/TMF_1975_25_3_a14/
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     title = {Analytic properties of the differential cross section of inelastic scattering},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     year = {1975},
     volume = {25},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1975_25_3_a14/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Analyticity regions of the differential cross-section $d^2\sigma/d \cos\theta\, d\varphi$ and the function $\Phi$ (see (2)) with respect to $\cos\theta$ at physical values of $\varphi$ are found for the process $a+b\to c+d+f$ in the approximation of pole diagrams. At all energies above the threshold and $0\leq\varphi\leq 2\pi$ for $d^2\sigma/d \cos\theta\, d\varphi$ ($\varphi\neq 0, \pi, 2\pi$ for $\Phi$) these regions include fixed neighbourhoods of physical values of $\cos\theta$.

[1] V. V. Ezhela, A. A. Logunov, M. A. Mestvirishvili, V. A. Petrov, TMF, 15 (1973), 153

[2] V. V. Ezhela, Preprint IFVE 71-36, Serpukhov, 1971 | Zbl

[3] G. L. Rcheulishvili, A. P. Samokhin, Preprint IFVE 74-6, Serpukhov, 1974