Geodesic
Solution of the Pauli–Källén equation for unstable and stable particles
Teoretičeskaâ i matematičeskaâ fizika, Tome 14 (1973) no. 3, pp. 357-365 
L. A. Luchnikov. Solution of the Pauli–Källén equation for unstable and stable particles. Teoretičeskaâ i matematičeskaâ fizika, Tome 14 (1973) no. 3, pp. 357-365. http://geodesic.mathdoc.fr/item/TMF_1973_14_3_a6/
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     author = {L. A. Luchnikov},
     title = {Solution of the {Pauli{\textendash}K\"all\'en} equation for unstable and stable particles},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {357--365},
     year = {1973},
     volume = {14},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1973_14_3_a6/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

A solution of the Pauli–Källén equation is obtained for unstable and stable particles for physical values of the parameters without any assumptions concerning the analytic continuation of the solution with respect to the parameters. It is shown that the homogeneous equation has only trivial solutions. The equation obtained can be used to investigate the resonant interaction of collision products and to investigate the energy, angular, and polarization distrtbutions of stimulated radiation.

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