Large-N(C) properties of the rho and f(0)(600) mesons from unitary resonance chiral dynamics
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Large-N(C) properties of the rho and f(0)(600) mesons from unitary resonance chiral dynamics

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Large-N(C) properties of the rho and f(0)(600) mesons from unitary resonance chiral dynamics

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Nieves Pamplona, Juan Miguel; Pich Zardoya, Antonio Perfil; Ruiz Arriola, Enrique
Aquest document és un/a article, creat/da en: 2011
We construct pi-pi amplitudes that fulfill exact elastic unitarity, account for one loop Chiral Perturbation Theory contributions and include all 1/Nc leading terms, with the only limitation of considering just the lowest-lying nonet of exchanged resonances. Within such scheme, the Nc dependence of sigma and rho masses and widths is discussed. Robust conclusions are drawn in the case of the rho resonance, confirming that it is a stable meson in the limit of a large number of QCD colors, Nc. Less definitive conclusions are reached in the scalar-isoscalar sector. With the present quality of data, we cannot firmly conclude whether or not the Nc=3 f0(600) resonance completely disappears at large Nc or it has a sub-dominant component in its structure, which would become dominant for a number of quark colors sufficiently large.

    Nieves Pamplona, Juan Miguel Pich Zardoya, Antonio Ruiz Arriola, Enrique 2011 Large-N(C) properties of the rho and f(0)(600) mesons from unitary resonance chiral dynamics Physical Review D 84 9 096002
http://dx.doi.org/10.1103/PhysRevD.84.096002
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