Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-01-25
Phys.Lett.B484:243-250,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages,4 figures, 3 tables; minor modifications in text and tables, references added, version to be published in Physics Let
Scientific paper
10.1016/S0370-2693(00)00657-2
In the diquark-quark model of the nucleon including scalar and axialvector diquarks we compare solutions of the ladder Bethe-Salpeter equation in the instantaneous Salpeter approximation and in the fully covariant (i.e. four-dimensional) treatment. We obtain that the binding energy is severly underestimated in the Salpeter approximation. For the electromagnetic form factors of the nucleon we find that in both approaches the overall shapes of the respective form factors are reasonably similar up to $Q^2 \approx 0.4$ GeV^2. However, the magnetic moments differ substantially as well as results for the pion-nucleon and the axial coupling of the nucleon.
Alkofer Reinhard
Oettel Martin
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