Geodesic
Coulomb two-body problem with internal structure
Teoretičeskaâ i matematičeskaâ fizika, Tome 74 (1988) no. 1, pp. 103-111

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The methods of the theory of extensions to an enlarged Hilbert space are used to construct a model of the interaction of the external (Coulomb) and internal (quark) channelsin the two-body problem. The mutual influence of the spectra of the corresponding channel Hamiltonians is studied; it leads, in particular, to a rearrangement of the spectra of hadronic atoms. An explicit representation is obtained for the $S$ matrix, and its singularities on the energy shell are studied. 
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     author = {Yu. A. Kuperin and K. A. Makarov and Yu. B. Melnikov},
     title = {Coulomb two-body problem with internal structure},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     volume = {74},
     number = {1},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1988_74_1_a8/}
}
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Yu. A. Kuperin; K. A. Makarov; Yu. B. Melnikov. Coulomb two-body problem with internal structure. Teoretičeskaâ i matematičeskaâ fizika, Tome 74 (1988) no. 1, pp. 103-111. http://geodesic.mathdoc.fr/item/TMF_1988_74_1_a8/