Meson properties in the 1/N(c) corrected NJL model
Jan, 2000
Citations per year
Abstract:
Properties of mesons are investigated within the Nambu--Jona-Lasinio model. We include meson-loop corrections, which are generated via a systematic 1/N_c-expansion in next-to-leading order. We show that our scheme is consistent with chiral symmetry, in particular with the Goldstone theorem and the Gell-Mann Oakes Renner relation. The numerical part focuses on the pion and the rho-meson sector. For the latter the 1/N_c-corrections are crucial in order to include the dominant rho -> pi pi-decay channel, while the leading-order approximation only contains unphysical q\bar q-decay channels. We show that a satisfactory description of the pion electromagnetic form factor can be obtained. Similarities and differences to hadronic models are discussed.- 11.15.Pg
- 14.40.-n
- Meson properties
- 1/ N c -expansion
- 1/ Nc-expansion
- meson: model
- Jona-Lasinio-Nambu model: correction
- expansion 1/N: color
- Feynman graph: higher-order
- symmetry: chiral
References(38)
Figures(0)