Geodesic
Off-shell two-particle scattering amplitude in the $P$-matrix approach
Teoretičeskaâ i matematičeskaâ fizika, Tome 75 (1988) no. 1, pp. 61-69

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A generalization of the $P$-matrix approach which makes it possible to describe the interaction of two particles off the energy shell is proposed. Explicit separation in the wave function of a part corresponding to free motion yields a compact expression for the off-shell scattering amplitude and gives directly a method for separable expansion of the amplitude. 
@article{TMF_1988_75_1_a5,
     author = {V. A. Babenko and N. M. Petrov},
     title = {Off-shell two-particle scattering amplitude in the $P$-matrix approach},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {61--69},
     publisher = {mathdoc},
     volume = {75},
     number = {1},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1988_75_1_a5/}
}
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V. A. Babenko; N. M. Petrov. Off-shell two-particle scattering amplitude in the $P$-matrix approach. Teoretičeskaâ i matematičeskaâ fizika, Tome 75 (1988) no. 1, pp. 61-69. http://geodesic.mathdoc.fr/item/TMF_1988_75_1_a5/