Nature of the f_0(600) from its N_c dependence at two loops in unitarized Chiral Perturbation Theory

Abstract

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 q-qbar dependence on the number of colors that, in contrast, is obeyed by the lightest vectors. The method suggests that a subdominant q-qbar component of the f_0(600) possibly originates around 1 GeV.

4 pages, 1 Figure. To appear in Phys. Rev. Lett

References in corpus (1)

• A low-lying scalar meson nonet in a unitarized meson model

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