Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2000-06-30
Eur.Phys.J.A8:553-566,2000
Physics
Nuclear Physics
Nuclear Theory
13 pages, EPJ style
Scientific paper
10.1007/s100500070078
In the covariant quark-diquark model the effective Bethe-Salpeter (BS) equations for the nucleon and the $\Delta$ are solved including scalar {\em and axialvector} diquark correlations. Their quark substructure is effectively taken into account in both, the interaction kernel of the BS equations and the currents employed to calculate nucleon observables. Electromagnetic current conservation is maintained. The electric form factors of proton and neutron match the data. Their magnetic moments improve considerably by including axialvector diquarks and photon induced scalar-axialvector transitions. The isoscalar magnetic moment can be reproduced, the isovector contribution is about 15% too small. The ratio $\mu G_E/G_M$ and the axial and strong couplings $g_A$, $g_{\pi NN}$, provide an upper bound on the relative importance of axialvector diquarks confirming that scalar diquarks nevertheless describe the dominant 2-quark correlations inside nucleons.
Alkofer Reinhard
Oettel Martin
Smekal Lorenz von
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