Abstract
A Lagrangian formulation of the Nambu-Jona-Lasinio model with separable interaction is given. The electromagnetic interaction is introduced in a nonminimal way to the nonlocal quark current. Various choices of the vertex form factors characterizing the composite structure of mesons and baryon are investigated. We find that the physical observables depend very weakly on form factor shapes. We calculate the πNN form factor considering nucleon as a three-quark system.
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Supported in part by the RFFR, Russia under contract 94-02-03463-a
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Anikin, I.V., Ivanov, M.A., Kulimanova, N.B. et al. The extended Nambu-Jona-Lasinio model with separable interaction: Low energy pion physics and pion-nucleon form factor. Z. Phys. C - Particles and Fields 65, 681–690 (1995). https://doi.org/10.1007/BF01578675
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DOI: https://doi.org/10.1007/BF01578675