Relativistic Quark Spin Coupling Effects in the Nucleon Electromagnetic Form Factors

Details Relativistic Quark Spin Coupling Effects in the Nucleon Electromagnetic Form Factors Relativistic Quark Spin Coupling Effects in the Nucleon Electromagnetic Form Factors

1999-11-03

arxiv.org/abs/nucl-th/9911016v1

Phys.Lett. B478 (2000) 86-93

Physics

Nuclear Physics

Nuclear Theory

13 pages, needs axodraw.ps and axodraw.sty for diagrams of Fig. 1

Scientific paper

10.1016/S0370-2693(00)00238-0

We investigate the effect of different forms of relativistic spin coupling of constituent quarks in the nucleon electromagnetic form factors. The four-dimensional integrations in the two-loop Feynman diagram are reduced to the null-plane, such that the light-front wave function is introduced in the computation of the form factors. The neutron charge form factor is very sensitive to different choices of spin coupling schemes, once its magnetic moment is fitted to the experimental value. The scalar coupling between two quarks is preferred by the neutron data, when a reasonable fit of the proton magnetic momentum is found.

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