The two-fermion vector potential of constraint theory from Feynman diagrams

Details The two-fermion vector potential of constraint theory from Feynman diagrams The two-fermion vector potential of constraint theory from Feynman diagrams

1995-10-16

arxiv.org/abs/hep-ph/9510302v1

Phys.Lett. B366 (1996) 409

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, Latex, with three figures included at the end of the article in a Latex file calling the FEYNMAN macropackage

Scientific paper

10.1016/0370-2693(95)01388-1

The relativistic fermion-antifermion bound state vector potential of constraint theory is calculated, in perturbation theory, by means of the Lippmann-Schwinger type equation that relates it to the scattering amplitude. Leading contributions of n-photon exchange diagrams are calculated in an approximation scheme that adapts eikonal approximation to the bound state problem. They produce terms proportional, in three-dimensional x-space, to $(\alpha/r)^n$. The series of leading contributions is summed.

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