Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1998-10-29
Annals Phys. 275 (1999) 113-147
Physics
High Energy Physics
High Energy Physics - Theory
39 pages, 14 figures, LaTeX2e, uses amssymb, minor changes, references added, to appear in Annals Phys
Scientific paper
10.1006/aphy.1999.5922
The Bethe-Salpeter equation provides the most widely used technique to extract bound states and resonances in a relativistic Quantum Field Theory. Nevertheless a thorough discussion how to identify its solutions with physical states is still missing. The occurrence of complex eigenvalues of the homogeneous Bethe-Salpeter equation complicates this issue further. Using a perturbative expansion in the mass difference of the constituents we demonstrate for scalar fields bound by a scalar exchange that the underlying mechanism which results in complex eigenvalues is the crossing of a normal (or abnormal) with an abnormal state. Based on an investigation of the renormalization of one-particle properties we argue that these crossings happen beyond the applicability region of the ladder Bethe-Salpeter equation. The implications for a fermion-antifermion bound state in QED are discussed, and a consistent interpretation of the bound state spectrum of QED is proposed.
Ahlig Steven
Alkofer Reinhard
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