- Normalization and perturbation theory for tightly bound states of the spinor Bethe-Salpeter equation
- Nuovo Cimento della Società Italiana di Fisica. A
- Pages (from-to)
- Number of pages
- Document type
- Faculty of Science (FNWI)
- Institute for Theoretical Physics Amsterdam (ITFA)
The normalisation integrals for the tightly-bound-state solutions of the spinor Bethe-Salpeter equation that have been derived recently are evaluated. Ghost states are found to appear when the continuous parameters characterising the type of fermion-boson interaction reach a critical value. Perturbation-theoretical methods are used to determine, for a pair of fermions with slightly different masses, the strength of the couplings that give rise to bound states with small values of the rest frame energy.
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