PT Journal
AU Nieves, J
   Pich, A
   Ruiz Arriola, E
TI Large-N(C) properties of the rho and f(0)(600) mesons from unitary resonance chiral dynamics
SO Physical Review D
JI Phys. Rev. D
PY 2011
BP 096002
EP 20pp
VL 84
IS 9
DI 10.1103/PhysRevD.84.096002
LA English
AB We construct pi pi amplitudes that fulfill exact elastic unitarity, account for one-loop chiral perturbation theory contributions and include all 1/N(C) leading terms, with the only limitation of considering just the lowest-lying nonet of exchanged resonances. Within such a scheme, the N(C) 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, N(C). Less definitive conclusions are reached in the scalar-isoscalar sector. With the present quality of data, we cannot firmly conclude whether or not the N(C) = 3 f(0)(600) resonance completely disappears at large N(C) or if it has a subdominant component in its structure, which would become dominant for a number of quark colors sufficiently large.
ER