Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-12-05
J.Phys.G32:189-202,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, 6 pages, accepted by J.Phys. G
Scientific paper
10.1088/0954-3899/32/2/010
We use a diquark model of the nucleon to calculate the electromagnetic form factors of the nucleon described as a scalar and axialvector diquark bound state. We provide an analysis of the zero-mode contribution in the diquark model. We find there are zero-mode contributions to the form factors arising from the instantaneous part of the quark propagator, which cannot be neglected compared with the valence contribution but can be removed by the choice of wave function. We also find that the charge and magnetic radii and magnetic moment of the proton can be reproduced, while the magnetic moment of the neutron is too small. The dipole shape of the form factors, $G^p_M(Q^2)/\mu_p$ and $G^n_M(Q^2)/\mu_n,$ can be reproduced. The ratio $\mu G^p_E/G^p_M$ decreases with $Q^2,$ but too fast.
Dong Yu-bing
He Jun
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