Geodesic
Phase of the Off-Shell Partial Amplitudes
Teoretičeskaâ i matematičeskaâ fizika, Tome 129 (2001) no. 1, pp. 103-105 
V. A. Petrov. Phase of the Off-Shell Partial Amplitudes. Teoretičeskaâ i matematičeskaâ fizika, Tome 129 (2001) no. 1, pp. 103-105. http://geodesic.mathdoc.fr/item/TMF_2001_129_1_a8/
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     author = {V. A. Petrov},
     title = {Phase of the {Off-Shell} {Partial} {Amplitudes}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     year = {2001},
     volume = {129},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2001_129_1_a8/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

We show that in the elastic scattering domain with one off-shell particle, the phase of the partial amplitude is independent of the particle virtuality.

[1] N. N. Bogolyubov, B. V. Medvedev, M. K. Polivanov, Voprosy teorii dispersionnykh sootnoshenii, Fizmatgiz, M., 1958 | MR