Geodesic
Dispersion relations for the $\gamma NN\to\gamma NN$ forward scattering amplitude and generalized optical theorem
Teoretičeskaâ i matematičeskaâ fizika, Tome 38 (1979) no. 1, pp. 36-47 
L. M. Muzafarov. Dispersion relations for the $\gamma NN\to\gamma NN$ forward scattering amplitude and generalized optical theorem. Teoretičeskaâ i matematičeskaâ fizika, Tome 38 (1979) no. 1, pp. 36-47. http://geodesic.mathdoc.fr/item/TMF_1979_38_1_a3/
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     author = {L. M. Muzafarov},
     title = {Dispersion relations for the $\gamma NN\to\gamma NN$ forward scattering amplitude and generalized optical theorem},
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Voir la notice de l'article provenant de la source Math-Net.Ru

On the basis of the general principles of quantum field theory, dispersion relations and a generalized optical theorem are proved for the $\gamma NN\to\gamma NN$ forward scattering amplitude by analytic continuation with respect to the mass variables.

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