Geodesic
Asymptotic fields and the $S$ matrix in the lowest sector of the Lee model
Teoretičeskaâ i matematičeskaâ fizika, Tome 16 (1973) no. 2, pp. 157-168

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It is shown that in the lowest sector of the Lee model there exist asymptotic fields that allow a particle interpretation. The $S$ matrix calculated by means of these fields is equal to the $S$ matrix obtained by solving the Lipmann–Sehwinger equation [2]. 
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     author = {L. A. Dadashev},
     title = {Asymptotic fields and the $S$ matrix in the lowest sector of the {Lee} model},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {157--168},
     publisher = {mathdoc},
     volume = {16},
     number = {2},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1973_16_2_a1/}
}
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L. A. Dadashev. Asymptotic fields and the $S$ matrix in the lowest sector of the Lee model. Teoretičeskaâ i matematičeskaâ fizika, Tome 16 (1973) no. 2, pp. 157-168. http://geodesic.mathdoc.fr/item/TMF_1973_16_2_a1/