Electromagnetic properties of diquarks

Details Electromagnetic properties of diquarks Electromagnetic properties of diquarks

2004-09-02

arxiv.org/abs/nucl-th/0409008v2

Few Body Syst. 35 (2004) 117-127

Physics

Nuclear Physics

Nuclear Theory

11 pages, 3 .eps figures, minor corrections in table and figure, no change in conclusions

Scientific paper

Diquark correlations play an important role in hadron physics. The properties of diquarks can be obtained from the corresponding bound state equation. Using a model for the effective quark-quark interaction that has proved successful in the light meson sector, we solve the scalar diquark Bethe-Salpeter equations and use the obtained Bethe-Salpeter amplitudes to compute the diquarks' electromagnetic form factors. The scalar ud diquark charge radius is about 8% larger than the pion charge radius, indicating that these diquarks are somewhat larger in size than the corresponding mesons. We also provide analytic fits for the form factor over a moderate range in Q^2, which may be useful, for example, in building quark-diquark models of nucleons.

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