Geodesic
Massless limit in the ladder approximation
Teoretičeskaâ i matematičeskaâ fizika, Tome 32 (1977) no. 3, pp. 348-353 Cet article a éte moissonné depuis la source Math-Net.Ru

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Solutions of the equation for the absorptive part of the forward scattering amplitude are found for 3 massless models. In the $\varphi^3$ model the asymptotics of the amplitude gets exponentially increasing while in the $\varphi^4$ model and in the spinor electrodynamics the massless limit does not change asymptotical properties of them amplitude. 
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K. G. Klimenko; V. E. Rochev. Massless limit in the ladder approximation. Teoretičeskaâ i matematičeskaâ fizika, Tome 32 (1977) no. 3, pp. 348-353. http://geodesic.mathdoc.fr/item/TMF_1977_32_3_a4/

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