2000/01/31 by Martin Oettel, M. Oettel, Reinhard Alkofer +1
Physics and Astronomy · #High-Energy Particle Collisions Research #Physics of Superconductivity and Magnetism #Quantum Chromodynamics and Particle Interactions #hep-ph #nucl-th
paper · pdf · doi:10.1016/s0370-2693(00)00657-2
published as Phys.Lett.B484:243-250,2000 · 12 pages,4 figures, 3 tables; minor modifications in text and tables, references added, version to be published in Physics Letters B
arxiv created 2000/05/16 · openalex publication_date 2000/07/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 Q2 ≈ 0.4 GeV2. However, the magnetic moments differ substantially as well as results for the pion-nucleon and the axial coupling of the nucleon.