Meson properties in the 1/Nc-corrected NJL model

✍ Scribed by M. Oertel; M. Buballa; J. Wambach

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 233 KB
• Volume: 676
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(00)00198-6

✦ Synopsis

Properties of mesons are investigated within the Nambu-Jona-Lasinio model. We include mesonloop 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 ρ-meson sector. For the latter the 1/N c -corrections are crucial in order to include the dominant ρ → ππdecay channel, while the leading-order approximation only contains unphysical q 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.