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See detailMasses of [70, l+] baryons in large N-c QCD
Matagne, Nicolas; Stancu, Floarea ULg

in International Journal of Modern Physics A (2007), 22(2-3), 663-666

Previous work is extended from SU(2) to SU(3) and we present results for the mass spectrum of the [70,l(+)](l=0,2) nonstrange and strange baryons in the 1/N-c expansion. We show that the dominant term is ... [more ▼]

Previous work is extended from SU(2) to SU(3) and we present results for the mass spectrum of the [70,l(+)](l=0,2) nonstrange and strange baryons in the 1/N-c expansion. We show that the dominant term is the spin-spin interaction and its contribution vanishes at large excitations. [less ▲]

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See detailPion and rho meson observables in a Nambu-Jona-Lasinio model including a tensor interaction
Jaminon, Martine ULg; Ruivo, M. C.; De Sousa, C. A.

in International Journal of Modern Physics A (2002), 17(32), 4903-4925

We calculate the low energy pipi scattering lengths a(0)(0), a(0)(2), b(0)(0), b(0)(2) and a(1)(1), the coupling of the rho to the pion g(rhopipi), the total width of the rho, the low q(2) behavior of the ... [more ▼]

We calculate the low energy pipi scattering lengths a(0)(0), a(0)(2), b(0)(0), b(0)(2) and a(1)(1), the coupling of the rho to the pion g(rhopipi), the total width of the rho, the low q(2) behavior of the pion electromagnetic form factor, and the pion scalar form factor within a chiral SU(2)(f) NJL-type Lagrangian where the spin 1 rho meson is generated from a four-quark tensor interaction. Such a simple model avoids the mathematical complication related to pi - a(1) mixing. Two types of regularization are discussed, mainly affecting the values of a(0)(0) and b(0)(0). We find rather good agreement with data. The p meson described in this way does not account for the meson vector dominance model: it does not contribute to the a(0)(0), a(0)(2) scattering lengths, and the charge radius of the pion is mainly ascribed to the bare photon quark coupling. Even if the shape of the electromagnetic form factor is well reproduced, the strong increase near the rho pole does not account for the p --> pipi decay but only reflects the q (q) over bar structure of the rho. [less ▲]

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