Violations of Lorentz Covariance in Light Front Quark Models

Details Violations of Lorentz Covariance in Light Front Quark Models Violations of Lorentz Covariance in Light Front Quark Models

2000-12-13

arxiv.org/abs/hep-ph/0012159v1

Mod.Phys.Lett. A15 (2000) 2191-2204

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 9 figures, Latex

Scientific paper

10.1142/S0217732300002814

Electromagnetic form factors of the nucleon from relativistic quark models are analyzed: results from null-plane projection of the Feynman triangle diagram are compared with a Bakamjian-Thomas model. The magnetic form factors of the models differ by about 15% at spacelike momentum transfer 0.5 GeV^2, while the charge form factors are much closer. Spurious contributions to electromagnetic form factors due to violations of rotational symmetry are eliminated from both models. One method changes magnetic form factors by about 10%, whereas the charge form factors stay nearly the same. Another one changes the charge form factor of the Bakamjian-Thomas model by more than 50%.

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