Nature of the f0(600) scalar meson from its Nc dependence at two loops in unitarized chiral perturbation theory.
By using unitarized two-loop chiral perturbation theory partial waves to describe pion-pion scattering we find that the dominant component of the lightest scalar meson does not follow the qq dependence on the number of colors that, in contrast, is obeyed by the lightest vectors. The method suggests that a subdominant qq component of the f0(600) possibly originates around 1 GeV.
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Departamento de Física Teórica II, Universidad Complutense de Madrid, 28040 Madrid, Spain.
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