We show how to obtain information about the states of an effective field theory in terms of the underlying fundamental theory. In particular we analyze the spectroscopic nature of meson resonances from the meson-meson scattering amplitudes of the QCD low energy effective theory, combined with the expansion in the large number of colors. The vectors follow a q̄q behavior, whereas the σ, κ and f0(...

We show how to obtain information about the states of an effective field theory in terms of the underlying fundamental theory. In particular, we analyze the spectroscopic nature of meson resonances from the meson-meson scattering amplitudes of the QCD low energy effective theory, combined with the expansion in the large number of colors. The vectors follow a qq behavior, whereas the sigma, kapp...

The large-Nc limit of the meson-baryon effective Lagrangian is shown to reduce to a semiclassical field theory. A chiral bag structure emerges naturally in the Nc → ∞ limit. A possible connection between the chiral bag picture and the Skyrme model is discussed. The classical meson-baryon theory is used to reproduce the M π non-analytic correction to the baryon mass obtained previously as a loop...

In this, the first of three papers, we present the essential features of a treatment of the U( 1) -Higgs model based upon a regulator free, momentum space subtraction scheme. The principle new results which follow from this approach are: (1) the fields of the theory satisfy their classical equations of motion, (2) the source of the vector meson field, f(x), is a finite, conserved current, (3) t...

In this paper we obtain a heavy meson bound state equation from the heavy quark equation of motion in heavy quark effective theory (HQET) and the heavy meson effective field theory we developed very recently. The bound state equation is a covariant extention of the light-front bound state equation for heavy mesons derived from light-front QCD and HQET. We determine the covariant heavy meson wav...

The nucleon and meson effective masses in the nonlinear Relativistic Mean-Field Theory (RMF) introducing a ω− ρ coupling is explored. It is shown that, in contrast to the usual Walecka model, not only the effective nucleon mass meff,N but also the effective ρ meson mass meff,ρ and the effective ω meson mass meff,ω are nucleon density dependent. PACS numbers: 24.10.Cn, 24.10.Jv, 21.30.Fe Submitt...